[Entomology • 2025] Dicnecidia narathiwatensis • A New Species of Dicnecidia Diakonoff, 1982 (Lepidoptera: Tortricidae: Olethreutinae) from Thailand

 

(A) Dicnecidia narathiwatensis Thonongtor & Pinkaew; 
(B, C) D. fumidana  Kuznetzov, 1997

in Thonongtor et Pinkaew, 2025. 

DOI: doi.org/10.58837/tnh.25.1.268382 

Abstract

Dicnecidia narathiwatensis Thonongtor and Pinkaew sp. nov. is described based on a single male specimen from Narathiwat Province, southernmost Thailand. In addition, D. fumidana Kuznetzov, 1997, previously recorded only from Vietnam, is recorded for the first time from Thailand and Laos. Illustrations of adults and genitalia are provided. The discovery of the new species increases the total number of described Dicnecidia to four.

Keywords: Eucosmini, Dicnecidia, new species, new record, Narathiwat Province

Wing pattern of Dicnecidia spp.
A. D. narathiwatensis sp. nov., male (holotype). B. D. fumidana, male (np12791). C. D. fumidana, female (np10188). Scale bars = 2 mm.

Head of Dicnecidia spp.
A. D. narathiwatensis sp. nov., male (holotype). B. D. fumidana, male (np12794). C.  D. fumidana, female (np10188).

Phawin Thonongtor and Nantasak Pinkaew. 2025. Addition a New Species of Dicnecidia Diakonoff, 1982 (Lepidoptera: Tortricidae: Olethreutinae) from Thailand and a New Record of the Genus from Thailand and Laos. Tropical Natural History. 25(1); 87-94. DOI: doi.org/10.58837/tnh.25.1.268382 (Oct. 2025) 

 

[Fungi • 2025] Sirindhornea siamensis (Basidiomycota: Agaricomycetes) • A New Sequestrate Boletoid Genus of Boletaceae from Thailand

 

Sirindhornea siamensis  

in Lueangjaroenkit, Doungsin, Jangsantear, Boonwanno, Sintawarak, Sahathippayakul, Supapongsri, Sakolrak, Himaman et Sutthinon, 2025. 

เห็ดก้อนอำพันเจ้าฟ้า | DOI: doi.org/10.58837/tnh.25.8.267496

Abstract

This study investigates sequestrate boletes from southern Thailand and presents a morphologically distinctive specimen with a strong cantaloupe-like odor. Detailed morphological and molecular phylogenetic analyses, utilizing the internal transcribed spacer (ITS), large subunit ribosomal RNA (LSU) and RNA polymerase II second largest subunit (RPB2) genes were performed to determine its taxonomic position. Nonetheless, the new sequestrate bolete exhibited a distinctive morphological features, including a scaly peridium, a characteristic cantaloupe-like odor at maturity. Together with molecular evidence, these characteristics clearly distinguish it from other sequestrate boletoid (Chamonixia, Durianella, Octaviania, Rossbeevera, and Turmalinea). These findings support the recognition of a novel genus within the subfamily Leccinoideae. Therefore, we propose a new genus and new species, Sirindhornea siamensis, for this sequestrate bolete species.

Keywords: fungal taxonomy, new genus, Leccinoideae, sequestrate boletes

  

Sirindhornea gen. nov.

เห็ดก้อนอำพันเจ้าฟ้า

Sirindhornea siamensis sp. nov. 

 Etymology.–The species epithet siamensis is named from the former name of Thailand, refers to the geographical origin of this new species.

Classification.–Leccinoideae,  Boletaceae,  Boletales, Agaricomycetes, Agaricomycotina, Basidiomycota

Piyangkun Lueangjaroenkit, Nootcharee Doungsin, Panrada Jangsantear; Tanyaporn Boonwanno; Phanin Sintawarak, Ananya Sahathippayakul, Vassana Supapongsri, Baramee Sakolrak, Winanda Himaman, Pornsawan Sutthinon. 2025. Sirindhornea siamensis, A New Sequestrate Boletoid Genus of Boletaceae from Thailand.  Tropical Natural History. Suppl. 8;  481-492. DOI: doi.org/10.58837/tnh.25.8.267496 

[Crustacea • 2025] Paralona sirindhornae & Karualona cambodiaensis • Two New Species of Cladocera (Cladocera: Chydoridae) from Southeast Asia

Paralona sirindhornae 

Sinev & Sanoamuang, 2025

 Tropical Natural History. Suppl. 8; 

คลาโดเซอแรนสมเด็จพระเทพรัตน์  ||  DOI: doi.org/10.58837/tnh.25.8.267184 

Abstract

Two new cladocera species of the family Chydoridae (Crustacea: Cladocera) are described from Southeast Asia. Populations of Paralona sirindhornae sp. nov. were found in Thailand and Cambodia, while Karualona cambodiaensis sp. nov. was detected in Cambodia only. Paralona sirindhornae sp. nov. differs from the only other species of the genus Paralona Šramek-Hušek, Strašcraba et Brtek, 1962, namely, Holarctic P. pigra (Sars, 1862), in its smaller size, different position of the head pores, and the morphology of thoracic limbs III–V. Our data suggest that the populations of Paralona from South America and Africa also belong to independent species rather than P. pigra. Karualona cambodiaensis sp. nov. differs from other species of the genus in the unique morphology of the posteroventral angle of the valves, as well as in the body shape and morphology of the antenna. The morphology and taxonomic position of two new species are discussed. Both new species appear to be extremely rare in Southeast Asia, and their discovery is a result of recent intensive sampling efforts.

Keywords: biodiversity, Lake Bueng Khong Long, Cambodia, rare species, taxonomy, Thailand

  Paralona sirindhornae sp. nov.

คลาโดเซอแรนสมเด็จพระเทพรัตน์

A, Paralona sirindhornae sp. nov. from Lake Bueng Khong Long, Bueng Khong Long District, Bueng Kan Province, Thailand (type locality), adult parthenogenetic female.
B, Karualona cambodiaensis sp. nov. from a canal at Ropeakpen, Baray district, Kampong Thom Province, Cambodia (type locality), adult parthenogenetic female.

Artem Y. Sinev and La-orsri Sanoamuang. 2025. Paralona sirindhornae sp. nov. and Karualona cambodiaensis sp. nov., Two New Species of Cladocera (Crustacea: Cladocera: Chydoridae) from Southeast Asia.  Tropical Natural History. Suppl. 8; 345-358. DOI: doi.org/10.58837/tnh.25.8.267184 [2025-10-20]

[Entomology • 2025] Protohermes sirindhornae • A New Species and New Records of the Dobsonfly Genus Protohermes van der Weele, 1907 (Megaloptera: Corydalidae: Corydalinae) from Thailand

 

Protohermes sirindhornae 

Piraonapicha, Chomphuphuang & Liu, 

in Piraonapicha, Chomphuphuang, Wayo, Tu, Hayashi et Liu, 2025.  

แมลงช้างกรามโตเทพรัตน์  ||  DOI: doi.org/10.58837/tnh.25.8.267194 

  facebook.com/KanyakornPiraonapicha

Abstract

The dobsonfly genus Protohermes van der Weele, 1907 is the most diverse genus within the family Corydalidae of the order Megaloptera. In the present study, we describe a new species of Protohermes, namely Protohermes sirindhornae Piraonapicha, Chomphuphuang & Liu, sp. nov., and report three additional species newly recorded from Thailand: P. cangyuanensis Yang & Yang, 1988, P. impunctatus Liu, Hayashi & Yang, 2008, and P. striatulus Navás, 1926. These findings are based on an integrative approach that combines both morphological and molecular data. A key to the males of Thai Protohermes species is provided.

Keywords: Neuropterida, aquatic insects, freshwater ecosystems, molecular identification, COI

Habitus photo of Protohermes sirindhornae Piraonapicha, Chomphuphuang & Liu, sp. nov. 
A. Male (Holotype); B. Female (Paratype). Scale bar = 1 cm.

Protohermes sirindhornae Piraonapicha, Chomphuphuang & Liu, sp. nov. living specimens, dorsal  view.
A. Male; B. Female. Scale bars = 1 cm.

Male genitalia of Protohermes sirindhornae Piraonapicha, Chomphuphuang & Liu, sp. nov. (Holotype from Thailand).
A. Dorsal view; B.Ventral view; C. Caudal view; D. Ectoproct in caudal view. Scale bar = 1 mm.

Kanyakorn Piraonapicha, Narin Chomphuphuang , Kanuengnit Wayo, Yuezheng Tu, Fumio Hayashi and Xingyue Liu. 2025. A New Species and New Records of the Dobsonfly Genus Protohermes van der Weele, 1907 (Megaloptera: Corydalidae: Corydalinae) from Thailand. Tropical Natural History. Supplement 8; 188-202. DOI: doi.org/10.58837/tnh.25.8.267194 [2025-10-14]

  facebook.com/ThaiBGO/posts/1288562939966423

  facebook.com/KanyakornPiraonapicha/posts/4469433176717249

[Fungi • 2025] Cyberlindnera sirindhorniae f.a., sp. nov., Blastobotrys princeps f.a., sp. nov. & B. siamensis f.a., sp. nov. • Three Novel Ascomycetous Yeast Species Isolated from Plant Leaves and Wild Mushrooms Collected in Thailand

 

Cyberlindnera sirindhorniae f.a., sp. nov. TBRC 19863T.

 

in Khunnamwong, Gungprakhon, Nualthaisong, Sakolrak, Srisuk et Limtong, 2025. 

 Tropical Natural History. Suppl. 8; 

ยีสต์สิรินธร  ||  DOI: doi.org/10.58837/tnh.25.8.267392

Abstract

Four yeast strains representing three novel species were isolated from two sources in Thailand, one from the leaf surface of a tall-stilt mangrove (Rhizophora apiculata, strain DMKU-RG45) and three from the fruiting bodies of wild mushrooms (strains DMKU-TM03, DMKU-SM11, and DMKU-SM28) collected in Thailand. Sequence analysis of the D1/D2 domain of the large subunit (LSU) rRNA gene and the internal transcribed spacer (ITS) region revealed that these four strains differed by 0.87–8.68% and 2.07–13.55% in their nucleotide divergence from their closest described species in the sequences of the D1/D2 domain of the LSU rRNA gene and the ITS region, respectively. In phylogenetic analyses, the strain DMKU-RG45 belonged to the genus Cyberlindnera and was distinct from other recognized species in this genus, whereas the strains DMKU-TM03, DMKU-SM11, and DMKU-SM28 were members of the genus Blastobotrys. However, they were in two different positions, each of which was distinct from closely related species. Based on molecular analyses and phenotypic characteristics, the strain DMKU-RG45 is proposed as Cyberlindnera sirindhorniae f.a., sp. nov. (the holotype is TBRC 19863T; MycoBank No. is MB 858763). The other three strains (DMKU-TM03, DMKU-SM11, and DMKU-SM28) are proposed as two novel Blastobotrys species. Blastobotrys princeps f.a., sp. nov. is proposed to accommodate the strain DMKU-TM03 (the holotype is TBRC 19382T; MycoBank No. is MB 858764). Blastobotrys siamensis f.a., sp. nov. is proposed to accommodate both strains DMKU-SM11 and DMKU-SM28 (the holotype is TBRC 19380T; MycoBank No. is MB 858765).

Keywords: Blastobotrys princeps, Blastobotrys siamensis, Cyberlindnera sirindhorniae, Mangrove Forest, Mushroom

Cyberlindnera sirindhorniae f.a., sp. nov. TBRC 19863T.
A‒C.colonies on YM agar after 7 days at 25 °C;
D.budding cells on YM agar after 3 days at 25 °C (bar, 10 μm);
E–G.pseudohyphae with blastoconidia grown on corn meal agar after 7 days at 25 °C.

Cyberlindnera sirindhorniae f.a., sp. nov. [the strain DMKU-RG45]

the holotype is TBRC 19863T; MycoBank No. is MB 858763

ยีสต์สิรินธร

Blastobotrys princeps f.a., sp. nov. [the strain DMKU-TM03]

(the holotype is TBRC 19382T; MycoBank No. is MB 858764)

ยีสต์เจ้าฟ้าหญิง

Blastobotrys siamensis f.a., sp. nov. [strains DMKU-SM11 and DMKU-SM28]

(the holotype is TBRC 19380T; MycoBank No. is MB 858765)

Pannida Khunnamwong, Pajongwan Gungprakhon, Panadda Nualthaisong, Baramee Sakolrak, Nanata Srisuk and Savitree Limtong. 2025. Three Novel Ascomycetous Yeast Species Isolated from Plant Leaves and Wild Mushrooms Collected in Thailand. Tropical Natural History. Suppl. 8; 399-414. DOI: doi.org/10.58837/tnh.25.8.267392 [2025-10-20]

[Fungi • 2025] Calathella sirindhorniae (Basidiomycota: Agaricales) • A New Cyphelloid Fungus from Thailand

Calathella sirindhorniae 

 in Lueangjaroenkit, Sahathippayakul, Supapongsri, Aowpitak, Sangrattanaprasert, Ngernsaengsaruay et Pinruan, 2025. 

 Tropical Natural History. Suppl. 8; 

เห็ดโกงกางจิ๋วสิรินธร  ||  DOI: doi.org/10.58837/tnh.25.8.267354  

Abstract

A novel cupulate basidiomycete fungus was discovered during a survey of mangrove-associated fungi in Chanthaburi and Phetchaburi Provinces, Thailand. This species, found exclusively on decaying Rhizophora mucronata hypocotyls in intertidal zones, forms minute fruiting bodies and shows close morphological and molecular resemblance to Calathella mangrovei Jones & Agerer, 1992. Phylogenetic analyses of ITS and LSU rDNA regions confirmed its placement within Calathella, as a distinct sister lineage to C. mangrovei. Therefore, these isolates represent a novel species, for which the name Calathella sirindhorniae sp. nov. is proposed.

Keywords: Calathella sirindhorniae, cyphelloid fungus, fungal taxonomy, new species, mangrove

Calathella sirindhorniae (BBH 50085, holotype).
A.under a stereomicroscope, showing the overall structure. The basidiomata, composed of white hyphae, have a brown surface colouration primarily due to mangrove sediment. Scale bar: 1 mm. B.Side view of the basidiomata under the SEM, revealing detailed surface features and structural arrangement. Scale bar: 1 mm. C.Top view under the SEM, highlighting the surface morphology. Scale bar: 500 μm.

Calathella sirindhorniae sp. nov. 

Etymology.–‘sirindhorniae’ (si.rin.dhorn.ni.ae) this species is named to honour Her Royal Highness Princess Maha Chakri Sirindhorn, in recognition of her deep interest in natural history and her significant contri-butions to biodiversity and environmental conservation in Thailand.

Piyangkun Lueangjaroenkit, Ananya Sahathippayakul, Vassana Supapongsri, Thithawat Aowpitak, Jiroat Sangrattanaprasert, Chatchai Ngernsaengsaruay, Umpawa Pinruan. 2025. Calathella sirindhorniae (Agaricales, Basidiomycota), A New Cyphelloid Fungus from Thailand.  Tropical Natural History. Suppl. 8;  460-471. DOI: doi.org/10.58837/tnh.25.8.267354 

 𝐶𝑎𝑙𝑎𝑡ℎ𝑒𝑙𝑙𝑎 𝑠𝑖𝑟𝑖𝑛𝑑ℎ𝑜𝑟𝑛𝑖𝑎𝑒 หรือ เห็ดโกงกางจิ๋วสิรินธร

 ตั้งชื่อชนิดตามพระนามาภิไธยของสมเด็จพระกนิษฐาธิราชเจ้า กรมสมเด็จพระเทพรัตนราชสุดาฯ สยามบรมราชกุมารี เพื่อถวายพระเกียรติเนื่องในโอกาสเฉลิมฉลอง 70 พรรษา และในฐานะเจ้าฟ้านักอนุกรมวิธานและความหลากหลายทางชีวภาพแห่งประเทศไทย โดยเห็ดโกงกางจิ๋วสิรินธรค้นพบที่สวนพฤษศาสตร์นานาชาติรัชกาลที่ 9 จังหวัดจันทบุรี และโครงการศึกษาวิจัยและพัฒนาสิ่งแวดล้อมแหลมผักเบี้ย อันเนื่องมาจากพระราชดำริ บ้านแหลม จังหวัดเพชรบุรี 

[Fungi • 2025] Metschnikowia sirindhorniae f.a., sp. nov. & Moniliella princeps sp. nov. • Two Novel Yeasts Species Isolated from Toddy Palm (Borassus flabellifer L.) Inflorescence Sap in Thailand

 

Metschnikowia sirindhorniae  

in Jindamorakot, Am-In, Kaewwichian, Khunnamwong et Limtong, 2025.

Tropical Natural History. Suppl. 8;  

DOI: doi.org/10.58837/tnh.25.8.267713 

Abstract

Two strains, YSP-519 and YSP-478, respectively representing novel ascomycetous and basidiomycetous yeast species, were obtained from toddy palm inflorescence sap collected in Thailand. The ascomycetous yeast strain YSP-519 was closely related to Metschnikowia agaves CBS 7744T. There were 1.6% nucleotide substitutions (9 nucleotide substitutions and 2 gaps out of 555 nt) in the D1/D2 domains of the LSU rRNA gene and 0.7% nucleotide substitutions (3 nucleotide substitutions out of 454 nt) in the ITS regions. The basidiomycetous yeast strain YSP-478 was closely related to Moniliella pollinis CBS 461.67T. It had 0.5 % nucleotide substitutions (3 nucleotide substitutions out of 554 nt) in the D1/D2 domains of the LSU rRNA gene and 2.0% nucleotide substitutions (9 nucleotide substitutions out of 473 nt) in the ITS regions. Phylogenetic analysis based on the concatenated sequences of the ITS regions and the D1/D2 domains confirmed that the two strains represent two new species. The name Metschnikowia sirindhorniae f.a., sp. nov. is proposed for YSP-519T), and Moniliella princeps sp. nov. is proposed for YSP-478T. The holotypes of M. sirindhorniae and Mo. princeps are TBRC 10642T and TBRC 10641T, respectively and the ex-type are CGMCC 2.6079T and CGMCC 2.6078T, respectively. The MycoBank numbers of M. sirindhorniae and Mo. princeps are MB858878 and MB858879, respectively.

Keywords: Metschnikowia sirindhorniae f.s., sp. nov., Moniliella princeps sp. nov., novel yeast species, Thailand

Metschnikowia sirindhorniae sp. nov. YSP-519T.
A. budding cells in YM broth after 3 days at 25 °C (bar, 10 μm);
B. pseudomycelium formed on PDA after 7 days at 25 °C (bar, 10 μm);
C. pseudomycelium in YM broth after 14days at 25 °C (bar, 10 μm).

 Metschnikowia sirindhorniae f.a., sp. nov. 

ยีสต์น้ำหวานดอกตาลโตนดสิรินธร

 Moniliella princeps sp. nov.

ยีสต์น้ำหวานดอกตาลโตนดเจ้าฟ้าหญิง

Sasitorn Jindamorakot, Somjit Am-In, Rungluck Kaewwichian, Pannida Khunnamwong and Savitree Limtong. 2025. Metschnikowia sirindhorniae f.a., sp. nov. and Moniliella princeps sp. nov., Two Novel Yeasts Species Isolated from Toddy Palm (Borassus flabellifer L.) Inflorescence Sap in Thailand.  Tropical Natural History. Suppl. 8;  439-448. DOI: doi.org/10.58837/tnh.25.8.267713 

[Crustacea • 2025] Macrobrachium debaratae • Morphology and Molecular Phylogeny of A New Species of the Genus Macrobrachium (Caridea: Palaemonidae) from Songkhram River, Northeast Thailand

Macrobrachium debaratae Siriwut, 

in Siriwut, Chaowvieng, Jeratthitikul, Chanabun, Panha et Sutcharit, 2025. 

Tropical Natural History. Suppl. 8; 

กุ้งเทพรัตน์  ||  https://li01.tci-thaijo.org/index.php/TNH 

Abstract

The recognized diversity of Macrobrachium prawns in Thailand has increased recently due to taxono-mic investigation using integrative approaches, i.e. from morphology and DNA barcoding. The freshwater habitats in northeast Thailand such as riparian wetland ecosystems provide diverse ecological conditions that promote adaptive diversification among organisms. The varying condition of the freshwater bodies can support the existence of cryptic species among the aquatic animal fauna, including in prawns of the genus Macrobrachium. Several Macrobrachium species have previously been reported in association with the vast network of tributaries that form the Mekong River basin. Newly described species and unidentified morphospecies have particularly been reported from this area in previous systematic studies, which indicates that the current known diversity of the aquatic fauna is likely to be largely incomplete. In this study, a new species of the genus Macrobrachium from the Songkhram River, one of the Mekong tributaries, is described and named as Macrobrachium debaratae Siriwut, sp. nov. This new species contains several distinct morphological characters from its congeneric and co-existing species group, such as the rostral teeth formula, the size and the shape of second pereiopods, and the tooth present on the cutting edge of the fingers of the chelae of the second pereiopods. Genetic distance analysis among the known Macrobrachium species supported this morphological classification as a new species with an interspecific COI divergence of 13%. The COI phylogenetic tree indicated that M. debaratae Siriwut, sp. nov. was monophyletic and was placed close to M. sirindhorn, a member within the M. pilimanus species group. This study highlights the need for a detailed morphological inspection to examine the variability in the taxonomic characters of Macrobrachium, particularly in the M. pilimanus species group found in mainland Southeast Asia tributaries. Further taxonomic review based on intensive sampling is required to provide a more adequate understanding of the diversity of Macrobrachium in the Mekong basin.

 

Keywords: Macrobrachium, Thailand, Songkhram River, New species, COI barcode

Morphological characteristics and chromatophore pattern variation in Macrobrachium debaratae sp. nov.
 A, B, D, E.Colouration and morphology of male specimens. C.Colouration and morphology of female specimen. Scale bar indicates 5 mm.

Macrobrachium debaratae Siriwut, sp. nov. 

Etymology.–The specific name “debaratae”derives from “Debaratana”, which means the insignia gem of goddess.The name is given in honor of Her Royal Highness Princess Maha Chakri Sirindhorn as a token of recognition. Her Royal Highness has been devoted to supporting and kindly participating in several pioneer projects studying Thai biodiversity and conservation led by government and private sectors.

Habitat of Macrobrachium debaratae sp. nov.  
A. Location of type locality. B.Aquatic plant (Potamogeton crispus L.) found dominantly in type locality. C, D. Habitat characteristics of middle Songkhram River.

Warut Siriwut, Apisara Chaowvieng, Ekgachai Jeratthitikul, Ratmanee Chanabun, Somsak Panha and Chirasak Sutcharit. 2025. Morphology and Molecular Phylogeny of A New Species, Macrobrachium debaratae sp. nov. (Caridea, Palaemonidae) from Songkhram River, Northeast Thailand. Tropical Natural History. Suppl. 8;  493-511. 

https://li01.tci-thaijo.org/index.php/tnh/article/view/268420

[Crustacea • 2025] Caridina sirindhornae • A New landlocked atyid Species (Decapoda: Atyidae) from the Middle Mekong Basin, Thailand

 

Caridina sirindhornae

Macharoenboon, Sutcharit, Siriwut & Jeratthitikul, 2025

กุ้งแคระน้ำจืดเจ้าฟ้า  ||  DOI: doi.org/10.58837/tnh.25.8.267352  

 facebook.com/EkgachaiJeratthitikul 

Abstract

A new species of landlocked and geographically restricted freshwater shrimp, Caridina sirindhornae sp. nov., is described from tributaries of the Mekong River in northeastern Thailand. The new species is morphologically similar to C. sumatrensis and C. maeklongensis by sharing characteristics such as a short antennular peduncle, the presence of epipods on the first four pereiopods, similar appendix interna on the male first pleopod, and a prominent subtriangular preanal carina without a spine. However, they can be distinguished by characteristics of the rostrum and egg size. Phylogenetic analyses based on partial sequences of the mitochondrial 16S rRNA and cytochrome oxidase subunit I (COI) genes (540 bp and 1,242 bp, respectively) robustly support the distinctiveness of C. sirindhornae sp. nov. Additionally, the findings show that the new species shares a sister relationship with C. lanceifrons, with a significant 16S rRNA p-distance of 6.74%, remarkably exceeding established species delimitation thresholds within the genus Caridina. This discovery represents the second landlocked Caridina species endemic to the Middle Mekong Basin in Thailand

Keywords: Crustacean, Indochina, molecular phylogeny, taxonomy, Southeast Asia mainland

Living female of Caridina sirindhornae sp. nov.
A. holotype MUMNH-CAR683-H. B. paratype MUMNH-CAR683-F4.

Scale bar = 2 mm.

Caridina sirindhornae sp. nov.

Etymology.–The specific epithet of the new species is in honor of H.R.H. Princess Maha Chakri Sirindhorn on the occasion of her 70th Birthday Anniversary and in recognition of her dedication and significant contributions to scientific and environmental pursuits.

Kongkit Macharoenboon, Chirasak Sutcharit, Warut Siriwut and Ekgachai Jeratthitikul. 2025. Caridina sirindhornae sp. nov., A New landlocked atyid Species (Decapoda: Atyidae) from the Middle Mekong Basin, Thailand. Tropical Natural History. Supplement 8 (2025); 203-219. DOI: doi.org/10.58837/tnh.25.8.267352  [2025-10-14] 

Caridina sirindhornae Macharoenboon et al., 2025  กุ้งแคระน้ำจืดเจ้าฟ้า 

กุ้งขนาดเล็ก มีสีสันสวยงาม พบสองรูปแบบสี รูปแบบแรกลำตัวมีสีดำอมน้ำตาลเข้ม รูปแบบที่สองมีสีส้ม ทั้งสองรูปแบบมีเส้นสีเหลืองทองพาดผ่านด้านบนลำตัว กรีมีสีเหลืองทอง มีสันอยู่บริเวณฐาน องศาหักลงเล็กน้อย ไข่มีสีน้ำตาล ขนาดไข่ปานกลาง เป็นกุ้งถิ่นเดียว
พบบริเวณที่ราบสูงโคราชในลุ่มแม่น้ำโขงตอนกลาง ในบริเวณประเทศไทยเท่านั้น 

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[Diplopoda • 2025] Coxobolellus sirindhornae • A New Thai Millipede Species of the Genus Coxobolellus (Spirobolida: Pseudospirobolellidae) from northern Thailand

Coxobolellus sirindhornae 

Pimvichai, Prasankok & Backeljau, 2025

 

กิ้งกือกระบอกหางมนสิรินธร || DOI: doi.org/10.58837/tnh.25.8.266861 

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Abstract

A new millipede species of the genus Coxobolellus is described from Mae Hong Son Province, Thailand: Coxobolellus sirindhornae sp. nov. The new species is defined by its gonopod morphology and COI DNA barcodes. These latter place the new species within the well-supported Coxobolellus clade. The new species exhibits four gonopod synapomorphies that are diagnostic for the genus: (1) a protruding process on the coxae of the 3rd (and sometimes 4th) pair of male legs, (2) large, triangular coxae on the 4th and 5th pairs of legs, (3) a short process on the preanal ring extending to or slightly beyond the anal valves, and (4) the posterior gonopod telopodite divided into two parts, with a conspicuous pore opening at the mesal margin at the end of the coxal part. The new species is included in an updated morphological identification key for all currently recognized Coxobolellus species.

Keywords: DNA barcoding, gonopod morphology, identification key, phylogeny

Live Coxobolellus sirindhornae sp. nov., holotype, (CUMZ-D00156) from Mae Hong Son Province (Photos by P. Pimvichai).

Coxobolellus sirindhornae sp. nov. 

กิ้งกือกระบอกหางมนสิรินธร

Piyatida Pimvichai, Pongpun Prasankok and Thierry Backeljau. 2025. A New Thai Millipede Species of the Genus Coxobolellus Pimvichai, Enghoff, Panha & Backeljau, 2020 (Diplopoda: Spirobolida: Pseudospirobolellidae). Tropical Natural History. Supplement 8 (2025): 38-51. DOI: doi.org/10.58837/tnh.25.8.266861 

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[Entomology • 2025] Ceratocombus sirindhornae • A New Species of the Minute Litter Bugs (Hemiptera: Heteroptera: Dipsocoromorpha: Ceratocombidae) from Thailand

Ceratocombus sirindhornae 

Kim, Keetapithchayakul, Phan, Ignatius & Jung, 2025 

  

Tropical Natural History. Suppl. 8;   

มวนหญ้าสิรินธร  ||  DOI: doi.org/10.58837/tnh.25.8.266938

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Abstract

A new species of the minute litter bug, Ceratocombus sirindhornae sp. nov. is described from Thailand. Detailed morphological information including description, diagnosis, and brief biology of the new species are presented.

Keywords: Dipsocoromorpha, Ceratocombidae, Ang Ka, Chiang Mai, Thailand

Ceratocombus sirindhornae sp. nov.

Junggon Kim, Tosaphol Saetung Keetapithchayakul, Quoc Toan Phan, Kaewpawika Jitthamma Ignatius and Sunghoon Jung. 2025. Ceratocombus sirindhornae sp. nov. (Hemiptera: Heteroptera: Dipsocoromorpha: Ceratocombidae): A New Species of the Minute Litter Bugs from Thailand. Tropical Natural History. Suppl. 8; 297-304. DOI: doi.org/10.58837/tnh.25.8.266938  [2025-10-20]

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[Arachnida • 2025] Damarchus sirindhornae • A New Species of Wishbone Spider Genus Damarchus (Mygalomorphae: Bemmeridae) from Doi Inthanon National Park, Thailand

Damarchus sirindhornae Kunsete & Warrit,

in Kunsete, Sivayyapram, Thanoosing, Traiyasut et Warrit, 2025.   

 Tropical Natural History. Suppl. 8;  

แมงมุมรังซ้อนสิรินธร  ||  DOI: doi.org/10.58837/tnh.25.8.266793

Abstract

The wishbone spider genus Damarchus, belonging to the family Bemmeridae, encompasses four recognized genera: Atmetochilus, Damarchus, Homostola, and Spiroctenus. Current distribution records indicate that Atmetochilus and Damarchus are exclusively found in Asia. To date, ten species of Damarchus have been documented, with three species reported in Thailand. However, our field surveys conducted since 2015 have identified multiple undescribed species within the genus that remain unclassified. Through detailed morphological analyses, we describe a new species, Damarchus sirindhornae Kunsete & Warrit, sp. nov., discovered in Doi Inthanon National Park. This species is classified within the workmani-group but can be distinguished from other members of the group by the absence of spines on the male coupling spur and the absence of secondary receptacles on the female spermathecae.

Keywords: Mygalomorphae, taxonomy, protected area

Damarchus sirindhornae Kunsete & Warrit, sp. nov.

Chawakorn Kunsete, Varat Sivayyapram, Chawatat Thanoosing, Prapun Traiyasut and Natapot Warrit. 2025. A New Species of Wishbone Spider Genus Damarchus from Doi Inthanon National Park, Thailand (Mygalomorphae: Bemmeridae).  Tropical Natural History. Suppl. 8; 390-398. DOI: doi.org/10.58837/tnh.25.8.266793 [2025-10-20]

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[Diplopoda • 2025] Thyropygus sirindhornae • Integrative Taxonomy of A New Millipede Species of the Genus Thyropygus Pocock, 1894 (Spirostreptida: Harpagophoridae) from Thailand

Thyropygus sirindhornae

 Pimvichai, Prasankok & Backeljau, 2025

 

กิ้งกือกระบอกหางแหลมสิรินธร || DOI: doi.org/10.58837/tnh.25.8.266935

Abstract

A new juliformian millipede species, Thyropygus sirindhornae sp. nov., is described from Chiang Rai Province, Thailand and assigned to the Thyropygus allevatus group based on two diagnostic gonopodal characters: (1) the gonopod telopodite with both tibial and femoral spines, and (2) a notably long tibial spine recurved toward the femoral spine. Despite its affiliation with the informal T. allevatus group, T. sirindhornae sp. nov. cannot be assigned to one of the four informal subgroups of the T. allevatus group because it lacks any of the diagnostic characters of these subgroups. Similarly, while the COI DNA barcode data support the distinctiveness of T. sirindhornae sp. nov. from other Thyropygus species within the T. allevatus group (mean interspecific sequence divergence of 0.16 ± 0.02, range: 0.12–0.19), they do not provide information about the sister group relationships or subgroup assignment of the new species. As a result, T. sirindhornae sp. nov. is tentatively assigned to the T. allevatus group, but is labelled as “incertae sedis” with respect to its sister group relations and subgroup classification. In fact, as the COI phylogeny only included species of the T. allevatus group, the assignment of T. sirindhornae sp. nov. to this informal species group needs to be confirmed by including representatives of other informal Thyropygus species groups.

Keywords: COI, gonopod, phylogeny

Thyropygus sirindhornae sp. nov., holotype, (CUMZ-D00157) from Chiang Rai Province, Thailand.

Thyropygus sirindhornae sp. nov.

กิ้งกือกระบอกหางแหลมสิรินธร

Etymology.– The species is named to honor Her Royal Highness Princess Maha Chakri Sirindhorn on the occasion of her 70th birthday, acknowledging her dedication to promoting biodiversity research and conservation initiatives in Thailand.

Piyatida Pimvichai, Pongpun Prasankok and Thierry Backeljau. 2025. Integrative Taxonomy of a New Thyropygus Pocock, 1894 Species from Thailand (Diplopoda: Spirostreptida: Harpagophoridae).  Tropical Natural History. Suppl. 8 (2025); 108-120. DOI: doi.org/10.58837/tnh.25.8.266935 [2025-10-14]