[Paleontology • 2026] Tametara mirim • Exceptional Brain and Ecological Diversity in the earliest Snakes

 

Tametara mirim

Simões, Sobral, Macrì, Ebel, Fachini, Martinelli, Nava, Paixão, Chiappe, Di-Poï & Hsiou, 2026

DOI: doi.org/10.1038/s41586-026-10809-9

Abstract

Understanding the ecological origin of snakes has remained a century-old challenge, hindered by an extremely sparse early fossil record and conflicting interpretations of fossil ecologies. Here we describe an exceptionally preserved Cretaceous fossil snake, Tametara mirim gen. et sp. nov., from Brazil, representing one of the earliest-diverging stem snakes. High-resolution micro-CT scans reveal unprecedented details of cranial nerves, inner ear and brain anatomy, enabling the most integrated reconstruction of stem snake neuroanatomy to date. Quantitative and qualitative endocast analyses demonstrate that Tametara had a brain morphology distinct from both other stem and extant snakes, revealing substantial early neuroanatomical disparity—and probably sensory functions—in snake evolution. Independent evidence from telencephalon shape and bone microstructure converges on a fossorial lifestyle for Tametara and non-fossorial for another stem snake: Dinilysia. These results indicate that major ecological transitions occurred early in snake evolution, and that known stem species do not represent the ancestral condition of crown snakes. Early snake evolution thus involved complex shifts in habitat use and sensory ecology, revealing greater ecological and neuroanatomical diversity than previously thought.

 

Systematic palaeontology

Squamata Oppel, 1811

Serpentes Linnaeus, 1758

Holotype (MPM 420) of Tametara mirim. 
 a, Photograph of the whole specimen with the articulated skull and postcranium in dorsal view. Ant, anterior; Bl, block number; Ce.V., cervical vertebrae; Do.V., dorsal vertebrae; Post, posterior; Sk, skull. b,c, Photographs of the skull in lateral (b) and dorsal (c) view. CB, compound bone; F, frontal; Oto, otoccipital; P, parietal; PFr, postfrontal; Pro, prootic; Ptg, pterygoid; Q, quadrate; Soc, supraoccipital; St, supratemporal. d–g, 3D renderings of an anterior precloacal (‘cervical’) vertebra in lateral (d) and anterolateral (e) views, and mid-precloacal (‘dorsal’) vertebra in dorsal (f) and left lateral (g) views. h–j, 3D renderings of the skull in the right lateral view (h) and with exposed brain endocasts in the right lateral (i) and dorsal (j) views. Mes., mesencephalon; Rho., rhombencephalon; Tel., telencephalon. Scale bars, 100 mm (a), 5 mm (b,c,h–j) and 1 mm (d–g). Specimen photos were taken by A.S.H.

Tametara mirim gen. et sp. nov.

Diagnosis. Tametara mirim can be distinguished from all other snakes based on the following combination of characters: postfrontal present but parietal (posterior) process absent*; parietal with posteromedial process present*; supraoccipital with sagittal crest, posterolaterally projecting nuchal crests*, well-developed anterolateral processes* and strongly overlapped by the parietal dorsally; otoccipitals not contacting each other medially (separated by posterior process of supraoccipital); quadrates with quadrate conch, suprastapedial process and pterygoid lappet; posterior surangular foramen present; precloacal vertebrae with well-developed and ventrolaterally oriented ...

Etymology. Tametara, meaning ‘adorned’ (referring to the pronounced sagittal crest of the holotype); mirim, meaning small-sized, in the native Brazilian, Tupí-Guaraní language.

Holotype. MPM 420 (Museu de Paleontologia de Marília, Marília, State of São Paulo, Brazil). Posterior half of a 3D-preserved skull and mandibles articulated with the anterior portion of the postcranium, including 103 presacral vertebrae.

Locality and age. The fossil was discovered by W.R.N. and G.M.X.P. in 2020, in William’s Quarry 2 at Sítio Paleontológico ‘José Martin Suárez’ (Presidente Prudente municipality, State of São Paulo, Brazil); Adamantina Formation, Bauru Group, Bauru Basin, late Santonian to early Campanian age (approximately 85–75 million years ago (Ma))22.

 

Tiago R. Simões, Gabriela Sobral, Simone Macrì, Roy Ebel, Thiago S. Fachini, Agustín G. Martinelli, William R. Nava, Giovanna M. X. Paixão, Luis M. Chiappe, Nicolas Di-Poï and Annie S. Hsiou. 2026. Exceptional Brain and Ecological Diversity in the earliest Snakes. Nature. DOI: doi.org/10.1038/s41586-026-10809-9 [22 July 2026]

[Herpetology • 2025] Trimeresurus hongheensis • Integrative Taxonomy identifies A New Species of Trimeresurus Lacépède, 1804 (Serpentes: Viperidae) from Yunnan Province, China

 

Trimeresurus hongheensis

Liang, Ding, Wang, Vogel, Shi, Gong, Wu & Chen, 2025 

 

红河竹叶青  ||  DOI: doi.org/10.24272/j.issn.2097-3772.2025.022

Abstract 

The genus Trimeresurus currently contains at least 56 recognized species of venomous terrestrial to arboreal species distributed across South and Southeast Asia. We collected several specimens of the subgenus Viridovipera in Yunnan Province, China in recent years. Based on morphological characters and phylogenetic analysis, we confirm that Trimeresurus yunnanensis is distributed in the west of the Honghe River in Yunnan Province and the Trimeresurus species living along the lower reaches of the Honghe River Basin and adjacent areas is an undescribed taxon. The new species Trimeresurus hongheensis sp. nov. can be distinguished from all known congeners by the pairwise genetic divergence in the mitochondrial cytochrome-b (p-distance≥5.0%) and 16S rRNA gene fragment (p-distance≥0.5%), and morphologically by the combination of the following characters: (1) hemipenes short and strongly spinose, with deep bifurcation; (2) a white postocular stripe bordered above and below by red or only a white postocular stripe present in males; postocular stripe white or absent in females; (3) the ventrolateral stripe is red (below) and white (above) in males and white in females; (4) iris brick red or sepia in males; iris yellow or rusty-red in females; (5) VEN 150–165 in males and 157–165 in females; SC 61–76 in males and 56–61 in females; (6) dorsal tail mostly rusty red; (7) 9–12 cephalic scales; (8) 19 or 21 dorsal scale rows at mid-body; (9) first supralabial completely separated from the nasal scale.

Keywords: Mitochondrial DNA, Morphology, Honghe River, Phylogenetics, Trimeresurus hongheensis sp. nov., Viridovipera

Trimeresurus hongheensis sp. nov. in Yunnan, China, males (Left) and females (Right) in life
 A: Mingjiu, Mengzi (Holotype GXNU251201). B: Mingjiu, Mengzi (GXNU251218). C: Yuanjiang (Paratype GXNU251204). D: Yuanjiang (Paratype GXNU251205). E: Mt. Dawei, Pingbian County, Yunnan (Paratype GXNU251219). F: Yuanjiang (Paratype GXNU251203).

Photos by Li Ding.

Holotype (adult male GXNU251201) of Trimeresurus hongheensis sp. nov. 
A: Dorsal view of head; B: Ventral view of head; C: Lateral view of head; D: Lateral view of middle body; E: Dorsal view of the specimen; F: Ventral view of the specimen.

Photos by Sheng-Chao Shi. Scale bars: 10 mm (A, B, C, D); 3 cm (E, F).

Comparison of head shape and coloration between males and females in Trimeresurus hongheensis sp. nov. Left, dorsal view of head; right, lateral view of head.
A & B: Specimen GXNU251201 (holotype, male); C & D: Specimen GXNU251219 (paratype, male); E & F: Specimen GXNU251205 (paratype, female); G & H: GXNU251218 (female). A & C: Different head shape in males (more elongated skull vs short skull); B & D: Different iris color in males (brick red vs sepia); E & G: Different head shape in females (more elongated skull vs short skull); F & H: Different postocular stripe (present vs absent) and different iris color (yellow vs rusty-red) in females.

Photos by Sheng-Chao Shi.

 Trimeresurus hongheensis sp. nov. 

Etymology: The new species name “hongheensis” refers to its type locality, the area around the Honghe River Basin, which is a boundary of the new species and T. yunnanensis. For common name we suggested as “Honghe green pit-viper” in English and “Hóng hé Zhú Yè Qīng (红河竹叶青)” in Chinese.

Diagnosis: (1) Head and body dorsum dark green, venter yellow green or light green. (2) 80% of the tail is rusty red, gradually fusing backwards, with dark red at the end of the tail. (3) Interstitial skin black. (4) Head dark green above, light yellow or light green below, clearly defined. (5) Iris brick red or sepia in males; iris yellow or rusty-red in females. (6) A white postocular stripe bordered above and below by red or only a white postocular stripe present in males, occupying only about 1–2 rows of scales across; postocular stripe white or absent in females. (7) Vivid, broad, bicolored ventrolateral stripe, red below and white above in males, covering 1–2 scales thick; thin white ventrolateral stripe present on the first row of DSR in females. (8) First supralabials separated from nasals. (9) Internasals separated by 0–2 scale. (10) Supraoculars separated by 9–12 smooth cephalic scales. (11) Head scales feebly keeled; 19 or 21 dorsal scale rows at mid-body, feebly keeled except for the outermost rows; VEN 150–165 in males (n=10), 157–165 in females (n=7); SC 61–76 in males (n=7), 56–61 in females (n=7). (12) Tail length to total length ratio (TaL/TL) 0.172–0.204 in males (n=7), 0.145–0.160 in females (n=7). (13) Hemipenes short and strongly spinose, with deep bifurcation.

 

Ya-Ting Liang, Li Ding, Xin Wang, Gernot Vogel, Sheng-Chao Shi, Xiong Gong, Zheng-Jun Wu and Ze-Ning Chen. 2025. Integrative Taxonomy identifies A New Species of Trimeresurus Lacépède, 1804 (Reptilia: Serpentes: Viperidae) from Yunnan Province, China. Zoological Research: Diversity and Conservation. 2(3): 182-195. DOI: doi.org/10.24272/j.issn.2097-3772.2025.022

[Herpetology • 2026] Trachischium lalremsangai • A New Species of Fossorial Snake of the Genus Trachischium Günther, 1858, from the Indo–Burma Biodiversity Hotspot

Trachischium lalremsangai 

Bhardwaj, Bal, Tluanga & Mirza, 2026

 DOI: doi.org/10.3897/herpetozoa.39.e187919  

facebook.com/snakeszeeshan

Abstract

A new species of fossorial natricine snake, Trachischium lalremsangai sp. nov., is described from the Indo-Burma biodiversity hotspot. The holotype was collected from Murlen National Park, Mizoram, near the India–Myanmar border, while the paratype originated from Haka Township, Chin State, Myanmar. Based on morphological and molecular data, the new species is related to T. reticulata (Blyth); however, it can be diagnosed from members of the genus Trachischium by possessing 13 dorsal scale rows, two postoculars, one anterior temporal scale, and two posterior temporal scales, in addition to distinctive colouration and other scalation details. The discovery of several new snake species within the Indo-Burma biodiversity hotspot underscores the need for increased research efforts and funding dedicated to this region in the near future.

Key Words: Blythia, Colubridae, Myanmar, Natricinae, northeast India, phylogeny, taxonomy

Trachischium lalremsangai sp. nov. holotype male MZMU 3757 in situ.

Trachischium lalremsangai sp. nov.

Diagnosis. A large-sized member of the genus reaching SVL of 351–432 mm. Dorsal scales smooth and iridescent, arranged in 13 rows throughout the body. Supralabials 5–6, 3rd and 4th in contact with orbit. Paired prefrontals; a pair of postoculars. Temporals 1+2. Ventrals 135 (+3–4 preventrals) and 28–29 subcaudals paired. Dorsum brown and ventrally, anterior one quarter of the snake is creamish white, while the rest is a shade of brown that has sparse white speckles.

Etymology. The specific epithet is a patronym honouring Prof. Hmar Tlawmte Lalremsanga of Mizoram University for his contributions to herpetology in Northeast India, his guidance to numerous students, and his facilitation of research throughout the region and the Indo-Burma biodiversity hotspot.

 Virender K. Bhardwaj, Amit K. Bal, Chhangte L. Tluanga and Zeeshan A. Mirza. 2026. A New Species of Fossorial Snake of the Genus Trachischium Günther, 1858, from the Indo–Burma Biodiversity Hotspot. Herpetozoa. 39: 203-215. DOI: doi.org/10.3897/herpetozoa.39.e187919 [19 May 2026]

 facebook.com/snakeszeeshan/posts/10165693872266424

[Herpetology • 2026] Calamaria hunanensis • A New Species of Calamaria Boie, 1827 (Squamata: Calamariidae) from Hunan Province, South Central China

Calamaria hunanensis

Zhang, Zhu, Wei, Shu, Li, Gernot, Niu, Ding, Chen, Guo & Shi. 2026

 

Hunan Reed Snake | 湖南两头蛇  ||  DOI: doi.org/10.24272/j.issn.2097-3772.2025.041 

Abstract

A new species of Southeast Asian reed snake Calamaria Boie, 1827, Calamaria hunanensis sp. nov., is described from Hunan Province, China. Genetic analysis based on the mitochondrial cyt b gene indicates that the new species forms a deeply divergent clade, with a minimum interspecific genetic distance of 16.1% from C. jinggangensis. Morphologically, it differs from other species of the genus in the following characters: 181 ventral scales and 23 subcaudals in the male; preocular present; eye diameter slightly smaller than the eye-mouth distance; mental not touching anterior shields; posterior chin shields in contact at the anterior third; 6 scales surrounding paraparietal; end of tail sharp-pointed, dorsal scales reduced to four rows above the 4th subcaudal scale anterior to the tail tip; dorsal body basically brown, with nine narrow indistinct deep brown stripes; light nuchal collar present; lateral margins of ventral scales pigmented dark brown, matching the coloration of the adjacent outermost dorsal scales; and ventral body yellow.

Keywords: Calamaria hunanensis, Taxonomy, Morphology, Phylogeny 

Holotype of Calamaria hunanensis sp. nov. CSIPI ZNY202207179 in a fresh condition
A, dorsal view; B, ventral view; C, dorsal head and neck; D, ventral head; E, right lateral head; F, left lateral head; G, lateral middle body; H, dorsal middle body; I, ventral tail; J, lateral tail.

Photographed by Keji Guo.

 Holotype of Calamaria hunanensis sp. nov. CSIPI ZNY202207179 in preservative

Calamaria hunanensis sp. nov.

Diagnosis: Male with 181 ventral scales and 23 subcaudals; preocular present; eye diameter slightly smaller than eye-mouth distance; mental scale not touching anterior shields; posterior chin shields in contact at anterior third part; 6 scales surrounding paraparietal; tail tip sharp-pointed, with dorsal scales reduced to the 4th rows above the 4th subcaudal scale anterior to the tail tip; dorsal body basically brown, with nine narrow indistinct deep brown stripes; light nuchal collar present; lateral margins of ventral scales pigmented dark brown, matching the coloration of the adjacent outermost dorsal scales; ventral body yellow.

Etymology: The specific epithet ‘hunanensis’ refers to Hunan Province, where the type locality is located. The Chinese name is suggested as ‘湖南两头蛇’. The English common name is suggested as ‘Hunan Reed Snake’.

Mengfei Zhang, Wenbo Zhu, Yifu Wei, Fu Shu, Qi Li, Vogel Gernot, Yandong Niu, Li Ding, Zening Chen, Keji Guo, Shengchao Shi. 2026. A New Species of Calamaria Boie, 1827 (Squamata: Calamariidae) from Hunan Province, South Central China. Zoological Research: Diversity and Conservation, 2026, 3(1): 1-12. DOI: doi.org/10.24272/j.issn.2097-3772.2025.041 

Researchgate.net/publication/404800547_A_new_species_of_Calamaria_from_Hunan_China

[Herpetology • 2026] Calamaria incredibilis • An unexpected Discovery of Hidden Diversity: A New Species of the Genus Calamaria (Serpentes: Calamariidae) from Guangxi, China

 

Calamaria incredibilis 

Qi, Nguyen, J. Wang, Zeng, Shi, Xu, Song, Zhong Huang, Mo, Poyarkov & Y.-Y. Wang, 2026

Guangxi Reed Snake | 广西两头蛇  ||  DOI: doi.org/10.3897/zse.102.188045

Abstract

As part of our investigations into the systematics of the Calamaria pavimentata species complex, we describe a new species of the genus Calamaria from Chongzuo and Guilin Cities, Guangxi, China, based on a combination of morphological and molecular evidence. Morphologically, Calamaria incredibilis sp. nov. is distinguished from other congeners by the following combination of morphological characters: nine enlarged maxillary teeth; rostral higher than wide; prefrontal shorter than frontal and contacting the first two supralabials; mental not in contact with anterior chin shields; dorsal scales in 13–13–13 rows, smooth throughout; a single preocular and postocular; four supralabials, with the 2nd and 3rd ones contacting the eye; five infralabials; six scales surrounding the paraparietal; 170–182 ventrals in males; 21–23 paired subcaudals in males; a relatively short tail (8.2–8.4% of total length in males), thick and nearly cylindrical, gradually tapering to an obtuse point; dorsal coloration brown, seven longitudinal series of interrupted dark brown stripes are visible along the body, extending from behind the pale-colored collar to the tip of the tail; the margins of the dorsal scales are heavily suffused with black pigment, forming an almost reticulate pattern; the ventral surface yellowish white, with dark brown blotches along the outermost lateral margins; the absence of light spots on the dorsal tail. Phylogenetic analyses based on mitochondrial cytochrome b sequences recover Calamaria incredibilis sp. nov. as a well-supported independent lineage, forming a sister relationship with a subclade comprising C. andersoni Yang & Zheng, C. synergis Zhang, Xu, Nguyen, Poyarkov, Vogel, Wang & Huang, and C. yunnanensis Chernov. The new species is separated from its closest relatives by substantial mitochondrial genetic divergence (p-distance 12.67% based on cytochrome b gene). The discovery of Calamaria incredibilis sp. nov. further highlights the underestimated diversity within the C. pavimentata species complex and underscores the importance of integrative taxonomic approaches for resolving cryptic diversity in morphologically conservative, semi-fossorial snake lineages from southern China, with Guangxi emerging as an important hotspot of cryptic diversification.

Key Words: Calamaria incredibilis sp. nov., C. pavimentata, morphology, mtDNA, taxonomy

Calamaria incredibilis sp. nov., adult male (SYS r002596, holotype) in preservative.
A. Dorsal view of body; B. Ventral view of body; C. Dorsal view of head; D. Ventral view of head; E. Lateral view of head, right side; F. Dorsal view of tail (posterior body).

 Photographs by Shuo QI.

Calamaria incredibilis sp. nov.

Diagnosis. Calamaria incredibilis sp. nov. can be distinguished from all other congeners by the combination of the following morphological characters: nine enlarged maxillary teeth; rostral higher than wide; prefrontal shorter than frontal and contacting the first two supralabials; mental not in contact with anterior chin shields; dorsal scales in 13–13–13 rows, smooth throughout; a single preocular and postocular; four supralabials, with the ...

Calamaria incredibilis sp. nov., adult male (GEP r093, paratype) in life.

Photograph by Jian WANG.

Etymology. The specific epithet incredibilis is a Latin adjective meaning “unbelievable” or “extraordinary,” referring to the unexpectedly high level of cryptic diversity revealed by the discovery of this species, particularly in relation to closely allied taxa within the C. pavimentata species complex and their close geographic proximity. Based on the type locality, we propose the following common names: “Guangxi Reed Snake” (English), 广西两头蛇 (guǎng xī liǎng tóu shé, Chinese), “Rắn mai gầm quảng tây” (Vietnamese), and Гуанси́йская карликовая змея (Guansiyskaya karlikovaya zmeya, Russian).

 Shuo Qi, Tan Van Nguyen, Jian Wang, Zhao-Chi Zeng, Jing-Song Shi, Yu-Hao Xu, Han-Ming Song, Zhong Huang, Yun-Ming Mo, Nikolay A. Poyarkov and Ying-Yong Wang. 2026. An unexpected Discovery of Hidden Diversity: A New Species of the Genus Calamaria H. Boie in F. Boie, 1827 (Squamata, Calamariidae) from Guangxi, China. Zoosystematics and Evolution. 102(2): 701-718.  DOI: doi.org/10.3897/zse.102.188045 [27 Apr 2026]

[Herpetology • 2026] Calamaria garoensis • A New fossorial Reed Snake (Serpentes: Calamariidae: Calamaria) from Northeast India, with A Nomenclatural Synopsis of the Calamaria pavimentata Complex

 

Calamaria garoensis Bharali, Sangma, Amarasinghe, Lalremsanga, Hazarika, Bohra & Purkayastha,

in Bharali, Sangma, Amarasinghe, Bohra, Swargiary, Marak, Hazarika, Das, Asem, Lyngdoh, Lalremsanga et Purkayastha, 2026. 

DOI: doi.org/10.47605/tapro.v15i1.397

Abstract

The fossorial reed snakes of the genus Calamaria are morphologically conservative, geographically structured, and frequently misidentified across broad regions, especially where historical names have been applied without explicit synonymy audits. During surveys in the Garo Hills, Meghalaya, Northeast India, we collected a series of Calamaria specimens referable to the “Calamaria pavimentata” concept historically used for the region. We evaluate these specimens using a morphology-first framework complemented by mitochondrial cytochrome b phylogenetic placement. Maximum-likelihood inference recovers the Meghalaya lineage as the strongly supported sister to C. mizoramensis, with an uncorrected p-distance of 6.3%; these mitochondrial values are treated as descriptive support rather than as threshold-based evidence. Morphologically, the Meghalaya lineage is diagnosable by a unique combination of scalation, tail morphology, and coloration, including a short tail that is not gradually tapering, an obtusely pointed tail tip, and a broad median black stripe on the tail venter. To stabilize name usage around the new taxon, we summarize the historical names associated with the C. pavimentata complex, emphasizing type localities and type material where known.

Keywords: Cytochrome b, Garo Hills, Meghalaya, morphology, phylogeny, taxonomy 

Calamaria garoensis Bharali, Sangma, Amarasinghe, Lalremsanga, Hazarika, Bohra & Purkayastha, sp. nov.  

Diagnosis. Calamaria garoensis sp. nov. can be distinguished from all congeners by the following combination of characters: 8–9 enlarged maxillary teeth; rostral broader than high; prefrontal shorter than the frontal and contacting the first two supralabials; mental not contacting the anterior chin shields; dorsal scales in 13–13–13 rows, smooth throughout; one preocular and one postocular; four supralabials, the second and third entering the orbit; five infralabials; six scales surrounding the paraparietal; 165–187 ventrals; 12–27 paired subcaudals; a short tail (TaL/TL 4.7–14.2%), not gradually tapering and terminating in an obtuse tip; dorsum dark brown to blackish brown with six narrow longitudinal stripes and a faint pale nuchal ring; ventral surface yellow with dark outer corners on the ventral scales; and a broad, distinct median black stripe on the tail venter.

Manmath Bharali, Chesime M. Sangma, A.A. Thasun Amarasinghe, Sanath C. Bohra, Pranjal Swargiary, Griksrang C. Marak, Arup K. Hazarika, Madhurima Das, Bipin M. Asem, Jennifer Lyngdoh, Hmar T. Lalremsanga and Jayaditya Purkayastha. 2026. A New fossorial Reed Snake (SQUAMATA: CALAMARIIDAE: Calamaria) from Northeast India, with A Nomenclatural Synopsis of the Calamaria pavimentata Complex. TAPROBANICA: The Journal of Asian Biodiversity. 15(1):12-25. DOI: doi.org/10.47605/tapro.v15i1.397 [14 April 2026]

https://www.taprobanica.org/Archives/volume-15-20-2026-31/volume-15-number-1-2026/v15i1-397.html

[Herpetology • 2026] Calamaria similis • A New Species of Calamaria (Serpentes: Calamariidae) from southern China, previously confused with Calamaria pavimentata

 

Calamaria similis

Qi, Nguyen, Yang, Xu, David, Shi, Liu, Rong, Korolev, Poyarkov & Wang, 2026 

Similar Reed Snake | 拟尖尾两头蛇  ||  DOI: doi.org/10.3897/zookeys.1277.187107  

 Abstract

Calamaria pavimentata Duméril, Bibron & Duméril, 1854 was originally described from Java Island, Indonesia, yet specimens from southern China, particularly Guangxi, have long been referred to this species based on general morphological resemblance. Herein, the taxonomic status of Chinese populations previously referred to as Calamaria pavimentata is re-evaluated using an integrative approach combining morphological data and mitochondrial DNA analyses, based on four specimens from Yangjiang City, Guangdong Province, and Chongzuo City, Guangxi Zhuang Autonomous Region, China. Phylogenetic analyses recover the Chinese specimens as a distinct and well-supported lineage within Calamaria. Notably, the Guangdong and Guangxi populations exhibit a relatively high intraspecific mitochondrial divergence (uncorrected p-distance = 10.78% based on the cytochrome b gene), despite the absence of consistent diagnostic morphological differences. Although mitochondrial DNA data from topotypic C. pavimentata, are currently unavailable, the observed morphological differences, together with the pronounced geographic disjunction between Java and southern China, support the recognition of the Chinese population as a distinct species, herein described as Calamaria similis sp. nov. from Guangdong and Guangxi, China. Detailed morphological examinations reveal that Calamaria similis sp. nov. differs from C. pavimentata and all of its currently recognized synonyms by having higher ventral scale counts in females, fewer subcaudal scales in males (but slightly more in females), a smaller maximum total length in males, and a shorter relative tail length in both sexes. Our results highlight the need for renewed field surveys in Java Island, Indonesia to rediscover C. pavimentata sensu stricto, and emphasize that other populations previously identified as C. pavimentata should be re-evaluated using integrative taxonomic approaches.

Key words: Calamaria similis sp. nov., Guangdong, Guangxi, integrative taxonomy, morphology, mtDNA, species complex

Calamaria similis sp. nov., adult male (SYS r001816, holotype) in preserved.
A. Dorsal view of body; B. Ventral view of body; C. Dorsal view of head; D. Ventral view of head; E. Lateral view of head, right side; F. Dorsal view of tail (posterior body). Photographs by Shuo Qi.

Calamaria similis sp. nov., in life, from Yangchun, Yangjiang, Guangdong, China.
A–C. Adult male (SYS r001816, holotype); A. Dorsal view of body; B. Anterior view of body; C. Ventral view of body; D–H. Not collected, sex undetermined; D. Dorsal view of body; E. Anterolateral view of body; F. Dorsal view of tail; G. Ventral view of head; H. Ventral view of body (cloacal region).

Photographs by Jing-Jian Liu.

Calamaria similis sp. nov. 

Etymology. The specific epithet similis is a Latin adjective meaning similar, referring to the strong morphological resemblance of this species to Calamaria pavimentata. This similarity has resulted in the species being previously misidentified and treated as C. pavimentata in numerous earlier studies (e.g., Yang and Zheng 2018). 

We propose the following common names for the new species: “Similar Reed Snake” (English), “拟尖尾两头蛇” (nĬ jiān wěi liăng tóu shé, Chinese), “Rắn mai gầm tương đồng” (Vietnamese), and “Сходная карликовая змея” (Skhodnaya karlikovaya zmeya, Russian).

Shuo Qi, Tan Van Nguyen, Jian-Huan Yang, Yu-Hao Xu, Patrick David, Jing-Song Shi, Jing-Jian Liu, Can-Zhong Rong, Alexey M. Korolev, Nikolay A. Poyarkov and Ying-Yong Wang. 2026. A New Species of Calamaria (Squamata, Calamariidae) from southern China, previously confused with Calamaria pavimentata Duméril, Bibron & Duméril, 1854. ZooKeys. 1277: 245-280. DOI: doi.org/10.3897/zookeys.1277.187107  [17 Apr 2026]

[Herpetology • 2026] Achalinus mirabilis • Taxonomic Reassessment of Achalinus jinggangensis (Zong & Ma, 1983) (Serpentes: Xenodermidae), with Description of A New Species from Zhejiang Province, China

Achalinus mirabilis Xu, Hu, Qi, Zhang, Zhou, Xu, Wang & Peng,   

in Y. Xu, Hu, Qi, Ma, Chen, T. Zhang, Y. Zhang, Sun, Zhou, J. Xu, Wang et Peng. 2026. 

Kuocang Moutain odd-scaled snake | 括苍山脊蛇  ||  DOI: doi.org/10.3897/zse.102.183453 

Abstract

The taxonomy of Achalinus jinggangensis has long remained unclear due to limited sampling and the consequent lack of publicly available molecular and distributional data. Here, we re-evaluate the taxonomic status of A. jinggangensis using an integrative approach that combines molecular phylogenetic analyses, detailed morphological comparisons, and direct examination of type material, and provide a comprehensive redescription of this species. In addition, we describe an unexpected new species from Kuocang Mountain, Linhai City, Zhejiang Province, China, Achalinus mirabilis sp. nov. Phylogenetic analyses indicate that Achalinus mirabilis sp. nov. appears to be most closely related to A. jinggangensis, although this relationship is not statistically supported, and exhibits substantial genetic divergence, as indicated by uncorrected p-distances of 9.5%–10.9% in the CO1 gene fragment. Morphologically, the new species is readily distinguished from A. jinggangensis by its distinctly keeled outermost dorsal scale row, a higher number of ventral scales in both sexes, and conspicuous differences in coloration. Our results highlight previously underestimated species diversity within Achalinus and refine the current understanding of its taxonomy. This study increases the number of recognized species in the genus Achalinus to 30, and underscores the importance of integrative approaches in resolving cryptic diversity and taxonomic complexity within the genus.

Key Words: Achalinus mirabilis sp. nov., Kuocang Mountain, molecular phylogeny, morphological characters, taxonomy

Coloration of the holotype of Achalinus mirabilis sp. nov. in life (QHU R2025051, adult female).
A. Dorsolateral view; B. Ventral view of the body. Photographs by J.H. Hu.

Achalinus mirabilis Xu, Hu, Qi, Zhang, Zhou, Xu, Wang & Peng, sp. nov.

Diagnosis. The new species Achalinus mirabilis sp. nov. is distinguished from all of its congeners by a combination of the following morphological characters: (1) size medium, with a maximum SVL of 270 mm in males and 332 mm in females; (2) tail relatively short, TAL/TL ratio 0.22 in males and 0.17–0.18 in females; (3) loreal scale absent; (4) length of suture between internasals substantially longer than that between prefrontals, LSBI/LSBP ratio 1.60–3.35; (5) dorsal scales strongly keeled, arranged in 23 rows throughout the body, with the outermost row also strongly keeled and substantially enlarged; (6) infralabials 6, with the anterior three or four in contact with the first pair of chin shields; (7) two pairs of chin shields; (8) maxillary teeth 27 based on the only counted female specimen; (8) ventral scales 163–166 in males and 174–178 in females; (9) subcaudals 64–68 in males and 53–56 in females, not paired; (10) in life, the dorsum is brown to dark brown with a slight metallic sheen, and the venter is uniformly light brown.

Etymology. The specific epithet mirabilis represents a Latin adjective in nominative singular, meaning “marvelous” or “remarkable”, and is given in reference to the distinctive morphology of this species within the genus Achalinus. In addition, the discovery of a previously unrecorded new species in Taizhou City, Zhejiang Province, a highly urbanized and economically developed region, was also unexpected. Based on its known distribution, Kuocang Mountain (Kuocangshan) in Linhai City, Taizhou City, Zhejiang Province, China, we propose the Chinese common name “括苍山脊蛇” (Kuò Cāng Shān Jǐ Shé) and the English common name “Kuocang Moutain odd-scaled snake”.

Live or fresh specimens of paratypes of Achalinus mirabilis sp. nov.
A. SMNH 20250126, subadult male; B. QHU R2025053, adult male;
C. QHU R2025054, adult female; D. SYS r003125, adult female.

Photographs by J.H. Hu (A–C) and H.J. Chen (D).

 Yuhao Xu, Jiahao Hu, Shuo Qi, Shun Ma, Haojun Chen, Tierui Zhang, Yunfei Zhang, Fanyue Sun, Jiajun Zhou, Jinan Xu, Yingyong Wang, Lifang Peng. 2026. Taxonomic Reassessment of Achalinus jinggangensis (Zong & Ma, 1983) (Serpentes, Xenodermidae), with Description of A New Species from Zhejiang Province, China. Zoosystematics and Evolution. 102(2): 387-409. DOI: doi.org/10.3897/zse.102.183453 

[Herpetology • 2025] Pareas melanops • A New Species of Pareas (Squamata: Pareidae) from southwestern Yunnan, China

 

Pareas melanops 

 Liu, Li, Yang & Rao, 2025

Black-eyed Slug-eating Snake  |  DOI: doi.org/10.1590/S1984-4689.v42.e24068 

Researchgate.net/publication/393112916

 

ABSTRACT

A new species of Pareas is described from Gengma County, Lincang City, Yunnan Province, China, based on morphological comparisons and phylogenetic analysis. The new species is phylogenetically closely related and morphologically similar to P. nigriceps and P. tigerinus. It can be distinguished from P. nigriceps and P. tigerinus and other congeners by a combination of the following characters: snout-vent length 352-472 mm in adults, tail length/snout-vent length 0.25-0.29, preoculars 1-2, subocular single, postocular single, one row of vertebral scales enlarged, 1-7 rows of dorsal scales keeled at mid-body, ventral scales 172-176, subcaudals 68-77, maxillary teeth 4-5, dorsal head solid black, 62-69 black bars on trunk, 27-33 black bars on tail, iris solid black.

KEYWORDS: Molecular; morphology; slug-eating snake; taxonomy.

The holotype (KIZ 2024092) of Pareas melanops sp. nov. in life:
 (A) general view; (B) dorsal view of the head; (C) lateral view of the head.

Pareas melanops sp. nov.

 

Diagnosis. Body size moderate (SVL 352-472 mm in adults), tail moderately long (TL/SVL 0.25-0.29), prefrontal bordering orbit, preoculars 1-2, subocular single, postocular single, subocular and postocular not fused, supralabials 7-8, infralabials seven, infralabial not fused with chin-shield, anterior temporal 1-3, posterior temporals 2-3, one row of vertebral scales slightly enlarged, 1-7 rows of dorsal scales keeled at mid-body, ventral scales 172-176, subcaudals 68-77, maxillary teeth 4-5, dorsal head solid black, dark nuchal band present, two large black spots on each side of head, 62-69 vertical black bars on each side of trunk, 27-33 vertical black bars on each side of tail, iris solid black.

Etymology. The specific epithet “melanops” is an adjec tive in the nominative case derived from the Ancient Greek “melanos” for “black” and “ops” for “eye”, and is given in reference to the conspicuous uniform black iris coloration of the new species. We recommend “Black-eyed Slug-eating Snake” for the common English name and Pinyin: heī yǎn dùn tóu shé for the common Chinese name of the new species.

 

Shuo Liu, Zhimin Li, Tong Yang and Dingqi Rao. 2025. A New Species of Pareas (Squamata: Pareidae) from southwestern Yunnan, China. Zoologia (Curitiba). 42; DOI: doi.org/10.1590/S1984-4689.v42.e24068

 Researchgate.net/publication/393112916_A_new_species_of_Pareas_from_southwestern_Yunnan_China

[Herpetology • 2025] Telescopus insularis, T. mazuchi, T. smidi, T. urii, ... • What is revealed from a widely distributed species in Africa and Southwest Asia? The Case of the Telescopus dhara–obtusus species complex (Squamata: Colubridae)

   Telescopus urii,

Telescopus salvadori, 

Telescopus smidi,   

Telescopus forskali  

Ribeiro-Júnior, Koch, Flecks, Campbell, Calvo, Spawls, Vidal & Meiri, 2025

DOI: doi.org/10.1093/zoolinnean/zlaf117 

Abstract

The Saharo-Sindic desert, the world largest arid region, is often treated as having low alpha and beta diversity of reptiles. However, the region is, in general, poorly studied and its biodiversity is likely to be grossly underestimated. Among the species in this region, the Telescopus dhara–obtusus complex has the widest distribution, a long history of controversial species definition, and unstable taxonomic status. We analysed 27 meristic characters, 19 measurements, and 35 osteological characters of this species complex by examining 282 specimens. We also analysed intra- and interspecific genetic structure and differentiation using five mitochondrial and two nuclear genes from 40 specimens. Our results reveal the T. dhara–obtusus complex as paraphyletic, comprising two major species groups: the T. dhara group and the T. obtusus group. The T. dhara group has eight species: T. dhara, T. guentheri (revalidated), T. pulcher, and five new species. The T. obtusus group is formed by 12 species: T. obtusus, T. somalicus, T. tripolitanus, T. variegatus, T. semiannulatus, T. beetzi, T. finkeldeyi, T. gezirae, and four new species. We describe all new taxa, redescribe the senior ones, and provide the first detailed description of a skull for the genus. The total number of species of Telescopus increases from 14 to 25. 

Arabian Peninsula, cryptic species, molecular phylogeny, osteology, Sahara Desert, taxonomic revision

Telescopus dhara group

Telescopus guentheri (revalidated),

Telescopus urii sp. nov. 

Telescopus urii. Coloration in life.
A, Hatseva, Arava Valley; photograph by S. Jamison. B, Judean Desert, West Bank; photograph by G. Haimovitch.
C, D, central Negev Desert, Israel; photographs by S. Jamison (C) and G. Haimovitch (D).
E–G, Gilboa Mountains, West Bank; photographs by S. Jamison (E, F) and B. Shermeister (G).
H, Arava Valley, Israel; photograph by G. Haimovitch.

Telescopus forskali sp. nov.,

Telescopus insularis sp. nov.,

Telescopus forskali. Coloration in life.
A, B, Dhofar, South Oman; photographs by S. Carranza.
C, Oman; photograph by S. Carranza. D, east of Thumrait, Oman; photograph by D. Hegner.

Telescopus salvadori. Coloration in life. A, B, Central Oman; photographs by S. Carranza.
Telescopus smidi. Coloration in life. A, B, near Taif, Saudi Arabia; photographs by S. Carranza.

Telescopus salvadori sp. nov.,

Telescopus smidi sp. nov.,

Telescopus geniezi sp. nov.,

Telescopus reussi sp. nov.,

Telescopus wangariae sp. nov.

 Telescopus crocheti. Coloration in life. A, B, Near Borama, Ethiopia; photographs by D. Hegner. C, Borama, Ethiopia; photograph by T. Mazuch. D, E, Shanshacade Village, Togdheer, Somalia; photographs by T. Mazuch.
Telescopus sp. (Telescopus crocheti and/or T. mazuchi). A, South of Omar Caves, Ethiopia; photograph by M. Largen. B, Meru National Park, Kenya; photograph by A. Childs.

The Telescopus obtusus group

Telescopus crocheti sp. nov.,

Telescopus mazuchi sp. nov.,

Telescopus somalicus (elevated to species status),

Marco A Ribeiro-Júnior, Claudia Koch, Morris Flecks, Patrick D Campbell, Marta Calvo, Stephen Spawls, Nicolas Vidal and Shai Meiri. 2025. What is revealed from a widely distributed species in Africa and Southwest Asia? The Case of the Telescopus dhara–obtusus species complex (Squamata: Colubridae). Zoological Journal of the Linnean Society. 205(3); zlaf117. DOI: doi.org/10.1093/zoolinnean/zlaf117 [06 November 2025]

[Herpetology • 2026] Philodryas pseudomamba • Morphological and Molecular Variation reveal Cryptic Diversity in the Racer Philodryas patagoniensis (Girard, 1858) (Squamata: Colubridae)

[B, E, H] Philodryas patagoniensis (Girard, 1858); 

[C, F, I] Philodryas pseudomamba Pietro, Sánchez, Poljak & Alcalde, 2026 

 

DOI: doi.org/10.3897/vz.76.e169219

Abstract

We analysed the genetic and morphological variation in Philodryas patagoniensis, a widely distributed South American racer snake. Two well-differentiated haplogroups were identified using mitochondrial gene sequences (12S and 16S) and the nuclear gene c-mos. Genetic divergence between these haplogroups correlates strongly with morphological differences, allowing the recognition of two morphotypes within P. patagoniensis. We integrated genetic and morphological data into a total evidence analysis using parsimony. Our results support the distinction between the two haplogroups/morphotypes, consistent with recognising two species within P. patagoniensis. Accordingly, we re-describe P. patagoniensis, refining its morphological variation and geographical distribution to reflect the observed genetic differentiation, and describe a new species. Morphological characteristics can distinguish the two species, including body measurements, scale patterns, and cranial osteology. The new species differs from P. patagoniensis sensu stricto in traits associated with arboreal habits, which are strongly correlated with the distribution of the two taxa across forested and open habitats in South America. Furthermore, P. patagoniensis sensu stricto has a significant Lycosa spider component in its diet, which is absent in the newly described species.

Keywords: Biodiversity, Dipsadinae, Philodryadini, Serpentes, South America, systematics, taxonomy

In-life colouration of
A a Monte of Plains and Plateaus specimen of P. patagoniensis (Rio Negro, Chipauquil, Meseta de Somuncura),
B a Pampa specimen of  P. patagoniensis (Buenos Aires, Sierra de Curamalal), and
C a Humid Chaco specimen of P. pseudomamba sp. nov. (Chaco, Tres Isletas).

Photos are not to scale. Photo credits: David Vera (A), Eduardo Schaeffer (B).

Lateral (A–C), dorsal (D–F), and ventral (G–I) views of the heads of representative specimens from both morphotypes.
The left column (A, D, G) shows a B-morphotype specimen from the Monte of Plains and Plateaus (Rio Negro province, MLP.R 5313). The middle column (B, E, H) features a B-morphotype specimen from the Pampa (Buenos Aires province, MLP.R 6039). The right column (C, F, I) presents an A-morphotype specimen from the Humid Chaco (Corrientes province, MLP.R 5449, holotype). Arrows and asterisks highlight character states (see File S2). Photographs A–F include a line-drawing diagram highlighting in grey the scales involved in each character state, as indicated by arrows and asterisks in the corresponding images. Scale bars = 5 mm.

Philodryas pseudomamba sp. nov.

Diagnosis. Philodryas pseudomamba sp. nov. differs from all other species of the genus by the following combination of characters: (1) dorsal scale rows 19–19–15, (2) HL/TTL between 2 and 3.4%, (3) SVL/TTL between 68 and 77.7%, (4) TL/TTL between 22.2 and 32%, (5) ventral scales between 166 and 199, (6) subcaudal scales between 81 and 124, (7) loreal scale rectangular, longer than tall, (8) dorsal half of the preocular markedly exceeding the posterior margin of the loreal, (9) supralabials 7 (3,4), (10) lateral border of the supraocular straight in dorsal view, (11) first temporal scale large (height being less than 40% of the length), (12) dorsal scales of the head with completely immaculate olive colouration featuring tiny black scale margins, (13) dorsal body design dotted, not maculated, and (14) ventral scales lacking lateral black spots.

Etymology. The prefix pseudo of the epithet derives from Greek, meaning “falseness” or “falsehood”. Mamba refers to the term “imamba” used in the Bantú language (spoken by various African ethnic groups) to designate snakes of the genus Dendroaspis, commonly known in English and other languages as “mambas”. The species name was explicitly inspired by D. polylepis (the black mamba), due to the general physical resemblance and notably aggressive behaviour shared by both species.

 Diego Omar Di Pietro, Julieta Sánchez, Sebastián Poljak and Leandro Alcalde. 2026. Morphological and Molecular Variation reveal Cryptic Diversity in the Racer Philodryas patagoniensis (Girard, 1858) (Squamata: Colubridae). Vertebrate Zoology. 76: 93-119. doi.org/10.3897/vz.76.e169219 [10 Feb 2026]