[Mollusca • 2026] Fansipanica milae, Vinatachea porcellana, ... • New taxa of Camaenidae (Gastropoda: Stylommatophora) from northern Vietnam

Fansipanica milae Páll-Gergely & Dedov,

   

in Páll-Gergely, Gojšina et Dedov, 2026.

DOI: doi.org/10.3897/zookeys.1280.185160

 

Abstract

The following new taxa are described from northern Vietnam: Fansipanica milae Páll-Gergely & Dedov, gen et sp. nov., Ducanhia Páll-Gergely, gen. nov. (type species: Helix balansai Morlet, 1886), Vinatachea porcellana Páll-Gergely, sp. nov. The reproductive anatomy of all three species is described. Helix (Chloritis) gereti Bavay & Dautzenberg, 1900 is moved to Fansipanica gen nov., and Camaena delsaerdti Thach & F. Huber, 2018 is moved to Vinatachea.

Key words: Anatomy, Fansipan Mountains, new species, systematics, taxonomy

Fansipanica milae gen. et sp. nov. 
A–C. Living specimen, D. Habitat. 

 

Fansipanica milae Páll-Gergely & Dedov, gen et sp. nov., 

Ducanhia Páll-Gergely, gen. nov. 

(type species: Helix balansai Morlet, 1886), 

Vinatachea porcellana Páll-Gergely, sp. nov. 

Barna Páll-Gergely, Vukašin Gojšina and Ivailo Dedov. 2026. New taxa of Camaenidae from northern Vietnam (Gastropoda, Stylommatophora). ZooKeys. 1280: 365-392. DOI: doi.org/10.3897/zookeys.1280.185160 [28 May 2026]

[Mollusca • 2026] Georissa meghalayaensis & Acmella bensoni • New Species of Georissa (Gastropoda: Hydrocenidae) and Acmella (Gastropoda: Assimineidae), with new records of Georissa from Northeast India

 

Georissa meghalayaensis sp. nov. and
Acmella bensoni sp. nov. 

 Das & Aravind, 2026

DOI: doi.org/10.5852/ejt.2026.1060.3284 

 x.com/atree_org

Abstract

The present study describes one new species each of Georissa and Acmella from Northeast India. Georissa meghalayaensis sp. nov. and Acmella bensoni sp. nov. are described from Krem Puri, Meghalaya. In addition, Georissa sp. was newly recorded from a soil-leaf litter sample collected at the Sadu Chiru waterfall area in Manipur, and Georissa sarrita was newly recorded from Tuipui in Mizoram. All species were identified based on morphological features, with shell sculpture and suture being the primary distinguishing characters. Notably, all the species from Meghalaya were found inside caves, except for Georissa meghalayaensis (Krem Puri), which was found at the edge of the cave entrance on a wet, moss-covered rocky wall. Further studies are required to confirm the true cavernicolous nature of these microsnails.

Keywords: biodiversity hotspot, cave biodiversity, conchology, conservation, endemics

Georissa meghalayaensis sp. nov. 

Acmella bensoni sp. nov. 

Nipu Kumar Das and Neelavar Ananthram Aravind. 2026. New Species of Georissa (Gastropoda: Hydrocenidae) and Acmella (Gastropoda: Assimineidae), with new records of Georissa from Northeast India.  European Journal of Taxonomy, 1060(1); 1–27. DOI: doi.org/10.5852/ejt.2026.1060.3284 [2026-05-27] 

 x.com/atree_org/status/2065383012116627609

[Mollusca • 2022] Burmochlamys fasciola, B. albida, B. versicolor, ... • Uncovering local Endemism from southeastern Myanmar: Description of the New Karst-associated Terrestrial Snail Genus Burmochlamys (Eupulmonata: Helicarionidae)

 

Burmochlamys Pholyotha & Panha,
A Burmochlamys fasciola sp. nov. paratype showing left and right lateral views;  
D B. albida sp. nov. paratype; E B. moulmeinica sp. nov. paratype;
F B. versicolor sp. nov. paratype; G B. whitteni sp. nov. paratype 

in Pholyotha, Sutcharit, Lin et Panha, 2022.   

 DOI: doi.org/10.3897/zookeys.1110.82461 

Abstract

Salween River basin’s karst ecosystems in southeastern Myanmar remain largely unexplored and are likely to harbour a high terrestrial snail diversity that are often associated with high levels of snail endemism. Here, an outstanding group of new karst-associated terrestrial snails, Burmochlamys gen. nov., are discovered. A study of the comparative morphological and anatomical data reveals that the reproductive tract and radula of this new genus are closely related to the helicarionid genus Sophina Benson, 1859 but shell morphology (shape, size, and sculpture) and mantle extensions are distinct from the latter genus. Burmochlamys gen. nov. now consists of four known nominal species, B. cassidula comb. nov., B. cauisa comb. nov., B. perpaula comb. nov., and B. poongee comb. nov., and five new species; B. albida sp. nov., B. fasciola sp. nov., B. moulmeinica sp. nov., B. versicolor sp. nov., and B. whitteni sp. nov. The highlight is that the members of the new genus show site-specific endemism, being restricted to karstic habitat islands of the Salween River basin. In addition, the discovery supports that the unique and complex structure of Salween River basin’s karst ecosystems are habitats in which the terrestrial malacofauna have speciated and become endemic.

Keywords: Diversity, endemic, Indochina, land snail, limestone, Salween River basin, taxonomy

Family Helicarionidae Bourguignat, 1877

Subfamily Durgellinae Godwin-Austen, 1888

Living snails of Burmochlamys species
A Burmochlamys fasciola sp. nov. paratype CUMZ 14214 showing left and right lateral views B B. cassidula specimen CUMZ 14209
C B. poongee specimen CUMZ 14210 D B. albida sp. nov. paratype CUMZ 14212
E B. moulmeinica sp. nov. paratype CUMZ 14217 F B. versicolor sp. nov. paratype CUMZ 14219 G B. whitteni sp. nov. paratype CUMZ 14222.

Genus Burmochlamys Pholyotha & Panha, gen. nov.

 

Type species: Burmochlamys fasciola sp. nov., by original designation.

Etymology: The name combines Burmo in reference to Burma, the historical name of Myanmar, and the Greek word chlamys meaning mantle or cloak in reference to land snail with well-developed mantle extensions. Therefore, the generic name means the Burmese land snail with the well-developed mantle extensions. The gender of the new generic name is feminine.

Diagnosis: Shell subglobose to globose, small size, little high spire, and sculptured with spiral furrows and undulating radial lines. Snail with five well-developed mantle extensions; caudal horn raised. Genitalia with penial retractor muscle attached at tip of epiphallic caecum; gametolytic organ with rather short to moderate cylindrical duct and bulbous sac; well-developed dart apparatus; flagellum absent. Radula with large monocuspid central tooth and attached by two smaller teeth; laterals and marginals undifferentiated, large monocuspid, and at base of each tooth on outer side attached by a smaller tooth.

B. cassidula comb. nov., B. cauisa comb. nov., 

B. perpaula comb. nov., and B. poongee comb. nov., 

and five new species; B. albida sp. nov., B. fasciola sp. nov., 

B. moulmeinica sp. nov., B. versicolor sp. nov., and B. whitteni sp. nov.

A adult of Burmochlamys moulmeinica sp. nov. while climbing slowly on the karst wall after raining at Lun Nya Pagoda B mating pairs of B. versicolor sp. nov. on the karst wall at Bayin Nyi Cave
C B. versicolor sp. nov. eaten by the carnivorous snail Carinartemis sp. on the karst wall at Bayin Nyi Cave D B. cassidula eaten by the carnivorous snail Haploptychius sp. on the karst wall at Kaw Gon Cave. 

 Arthit Pholyotha, Chirasak Sutcharit, Aung Lin and Somsak Panha. 2022. Uncovering local Endemism from southeastern Myanmar: Description of the New Karst-associated Terrestrial Snail Genus Burmochlamys (Eupulmonata, Helicarionidae).  ZooKeys. 1110: 1-37. DOI: doi.org/10.3897/zookeys.1110.82461 

[Mollusca • 2025] Chamalycaeus aduncus • The First Record of an Operculate Micro Land Snail from the Alycaeinae (Caenogastropoda: Cyclophoridae) in Cambodia

 

Chamalycaeus aduncus Jirapatrasilp,   

in Jirapatrasilp, Thi, Chantha, Chourn, Sophea, Jeratthitikul, Pholyotha, Siriwut, Srisonchai, Panha et Sutcharit, 2025. 

www.ruthenica.net/node/6016

 Researchgate.net/publication/390396808 

 facebook.com/ASRUChula

 

This study reports the first record of the operculate micro land snail from the Alycaeinae, Chamalycaeus aduncus Jirapatrasilp sp. nov., also the first new species of the genus in Cambodia, based on a recent survey in Battambang. This new species is similar to Chamalycaeus excisus (Möllendorff, 1887) and C. excisus sublimus Páll-Gergely et Auffenberg, 2019 from the Philippines, in shell size and shape, and the strongly downwards coiling of R3, but differs in having a shorter R2 without any blunt keel, a round aperture without any incision, and a beak- or hook-like basal edge of the outer peristome. 

Keywords: Battambang; Cyclophoroidea; Gastropoda; Mollusca; taxonomy

Chamalycaeus aduncus sp. nov.
A paratype CUMZ 14462/1, and B paratype CUMZ 14462/2, showing a scraping hole at the umbilical side.

. Representative SEM images of Chamalycaeus aduncus sp. nov., holotype CUMZ 14461
 A whole shell in different positions, and B Close-up images of the aperture; white arrows pointing to the beak- or hook-like basal edge of the outer peristome.

Chamalycaeus aduncus Jirapatrasilp sp. nov.

 

Parin JIRAPATRASILP, Sothearen THI, Nasak CHANTHA, Phyroum CHOURN, Chhin SOPHEA, Ekgachai JERATTHITIKUL, Arthit PHOLYOTHA, Warut SIRIWUT, Ruttapon SRISONCHAI, Somsak PANHA and Chirasak SUTCHARIT. 2025. The First Record of an Operculate Micro Land Snail from the Alycaeinae (Caenogastropoda, Cyclophoridae) in Cambodia, with Description of A New Species of Chamalycaeus von Möllendorff, 1897. Ruthenica Russian Malacological Journal. 35(2); 65-72. https://www.ruthenica.net/node/6016

 Researchgate.net/publication/390396808_The_first_record_of_an_operculate_micro_land_snail_from_the_Alycaeinae_Cyclophoridae_in_Cambodia

 facebook.com/ASRUChula/posts/1081408774003851

[Mollusca • 2026] Operculate Land Snails (Gastropoda: Caenogastropoda: Cyclophoroidea) from Padang Bindu Karst, South Sumatra, Indonesia with the Description of A New Species, Chamalycaeus dayangmerindu

 

c. Chamalycaeus dayangmerindu Aulia & Nurinsiyah, sp. nov.;
d. C. korintjiensis (Páll-Gergely, 2020), holotype (ZMA.MOLL 135672).
a. Stomacosmethis cf. jagori (E. von Martens, 1860); b. S. jagori (E. von Martens, 1860), syntype (SMF 109304); 

in Aulia, Nurinsiyah, Mujiono, Páll-Gergely et Ambarwati, 2026.  

 DOI: doi.org/10.3897/zookeys.1272.179378

Abstract

The study on Cyclophoroidea from Padang Bindu Karst, South Sumatra, was conducted to document the species diversity of the superfamily in the area. The samples, including leaf litter and soil samples, were collected in May–June 2021 and followed by the determination and examination on 2023 to 2024 in the Museum Zoologicum Bogoriense. In total 3,780 specimens from the superfamily Cyclophoroidea were examined. Measurements of the shell and operculum were performed using L.A.S V4. 13.0 and IMAGE J. The research revealed 11 species from three families (Cyclophoridae, Diplomatinidae, Pupinidae) and four subfamilies. Plectostoma kitteli is the most abundant species followed by Stomacosmethis cf. jagori (19.84%) and Diplommatina liwaensis (6.67%). A new species, Chamalycaeus dayangmerindu Aulia & Nurinsiyah, sp. nov. is described. The study also discovered four species endemics to Sumatra with one species among them so far only recorded from Padang Bindu karst area. These findings emphasize the region’s unique biodiversity.

Key words: Biodiversity, conservation, limestone, molluscs, operculum

Shells of Alycaeinae. a. Stomacosmethis cf. jagori (E. von Martens, 1860); b. Stomacosmethis jagori (E. von Martens, 1860), syntype (SMF 109304);
c. Chamalycaeus dayangmerindu sp. nov.; d. Chamalycaeus korintjiensis (Páll-Gergely, 2020), holotype (ZMA.MOLL 135672).

Chamalycaeus dayangmerindu Aulia & Nurinsiyah, sp. nov.

Habitat. Limestone rocks.

Distribution. The species is so far only recorded from Padang Bindu Karst, South Sumatra.

Etymology. The species name Dayang Merindu was inspired by Princess Dayang Merindu, a figure from local folklore. According to the legend, Princess Dayang Merindu ignored the greeting of a man, as she was already married. Her action was then perceived as arrogance, and the man cursed her into stone. The stone associated with this tale is located inside Gua Putri, a karst cave formation in the Padang Bindu area.

 Latifah Nurul Aulia, Ayu Savitri Nurinsiyah, Nova Mujiono, Barna Páll-Gergely and Reni Ambarwati. 2026. Operculate Land Snails (Gastropoda, Caenogastropoda, Cyclophoroidea) from Padang Bindu Karst, South Sumatra, Indonesia with the Description of A New Species, Chamalycaeus dayangmerindu. ZooKeys. 1272: 1-31. DOI: doi.org/10.3897/zookeys.1272.179378 [02 Mar 2026]

[Mollusca • 2025] Theobaldius? konkanensis • A New Species of cyclophorid land snail (Gastropoda: Caenogastropoda: Cyclophoridae) from the coastal regions of Maharashtra, India

Theobaldius? konkanensis 

Bhosale, Thackeray, Yadav, Khandekar, White & Raheem, 2025

DOI: doi.org/10.1080/13235818.2025.2462864 

instagram.com/thackeraywildlifefoundation

 

ABSTRACT

We describe a new species of cyclophorid land snail, Theobaldius? konkanensis n. sp., from the coastal and lower elevational region of the northern Western Ghats in Maharashtra, India. Theobaldius? konkanensis n. sp. can be differentiated from other species of Theobaldius Nevill, 1878 by the combination of a conoidally depressed shell with a more elevated spire, a deep notch on the apertural margin overhung by a prominent raised fold, and an operculum with the edges of the whorls conspicuously raised and bearing short spines. We provide a detailed description of the new species, focusing on the shell, operculum, jaw and radula, and the external morphology of the living animal; we map its distribution using recently collected data, and compare it with other species of Theobalidus and other cyclophoroidean genera.

KEYWORDS: Konkan, northern Western Ghats, operculum, taxonomy, Theobaldius?

Theobaldius? konkanensis n. sp.

 

Amrut Bhosale, Tejas Thackeray, Omkar Yadav, Akshay Khandekar, Tom S. White and Dinarzarde C. Raheem. 2025. A New Species of cyclophorid land snail (Caenogastropoda: Cyclophoridae) from the coastal regions of Maharashtra, India. Molluscan Research. 45(2); 157-169. DOI: doi.org/10.1080/13235818.2025.2462864 [11 Mar 2025] 

  instagram.com/p/DHlgCVxtF58/thackeraywildlifefoundation

[Mollusca • 2025] Lagocheilus hayaomiyazakii • First Record of the Genus Lagocheilus W.T. Blanford, 1864 (Caenogastropoda: Cyclophoridae) from the northern Western Ghats, India, with the Description of A New Species

Lagocheilus hayaomiyazakii

Bhosale, Thackeray, Raheem, Pawar & Khandekar, 2025

Tilari hairy snail ||  Journal of Conchology. 45(4);

Abstract

 We describe a new species of Lagocheilus from Ratoba Point, Tilari Nagar, Kolhapur District, in the northern Western Ghats of Maharashtra, India. Lagocheilus hayaomiyazakii n. sp. can be distinguished from its South Indian and Sri Lankan congeners by a unique combination of shell characters: a conoidal shell with a raised spire, a broad base, and narrow umbilicus; a wide aperture with a clearly expanded lip and a distinct angle where the lip joins the parietal wall; shell sculpture of prominent, widely spaced spiral lirae; and, in juvenile and young adults, a thick peri­ostracum with numerous periostracal hairs. We also describe the living animal, operculum, radula and jaw. This is the first record of the genus Lagocheilus from the northern Western Ghats, extending its known distribution range by 540 km north into the Indian Peninsula.

Key words. Hairy land snail, Japonia, Lagocheilus hayaomiyazakii n. sp., taxonomy, Western Ghats

Shell of South Indian and Sri Lankan Lagocheilus species.
 A–C, L. malleatus from the Beddome collection (NHMUK 1875. 03.06.22/1). D–F, L. shiplayi lectotype (NHMUK 20110216/1). G–I, L. shiplayi from the Barnacle collection (NHMUK 20110217/1). J–L, L. binoyae syntype (NHMUK 1958.1.14.26).
M–O, L. occultus syntype (NHMUK 1958.1.14.29). P–R, L. vescus syntype (NHMUK 1958.1.14.13). S–U, Lagocheilus hayaomiyazakii n. sp., holotype (NRC-AA-9576).

A–R © The Trustees of the Natural History Museum, London.

Lagocheilus hayaomiyazakii n. sp.
E, male, paratype NRC-AA-9601. F, female, paratype NRC-AA-9600.

Lagocheilus hayaomiyazakii n. sp. 

 Diagnosis. The new species can be diagnosed from its South Indian and Sri Lanka congeners by the following combination of shell characters: a conoidal shell with a raised spire, broad base and narrow umbilicus; a wide aperture with a clearly expanded lip and a distinct angle where the lip joins the parietal wall; shell sculpture of prominent widely spaced spiral lirae; and numerous hairs on the periostracum of juvenile and young adult shells.

Etymology. The specific epithet is a Latinised patronym honouring Hayao Miyazaki (b. 1941), a renowned Japanese animator, filmmaker, and co-founder of Studio Ghibli; the new species is named after him in recognition of his contribution to animation films. The suggested English common name is Tilari hairy snail.

Amrut Bhosale, Tejas Thackeray, Dinarzarde C. Raheem, Swapnil Pawar and Akshay Khandekar. 2025. First Record of the Genus Lagocheilus W.T. Blanford, 1864 (Caenogastropoda: Cyclophoridae) from the northern Western Ghats, India, with the description of L. hayaomiyazakii n. sp. Journal of Conchology. 45(4); DOI. 10.61733/jconch/4557 [14 October 2025]

  

[Mollusca • 2025] Pseudobuliminus beijingensis • Polyphyly in A Morphologically defined Genus: Phylogeny and Morphology of Pseudobuliminus (Eupulmonata: Camaenidae) from eastern and northern China, with A Checklist of Species from mainland China

Pseudobuliminus beijingensis  X.-X. Wang,

in Zhang & Wang, 2025  

DOI: doi.org/10.1080/13235818.2025.2494894

 

ABSTRACT  

Pseudobuliminus (Eupulmonata: Camaenidae) has traditionally been delimited to exclusively contain species with conoidal shells, but questions regarding its monophyly have remained. Extensive morphometric analyses conducted on almost all Pseudobuliminus species from China indicate that possessing a conoidal shell alone is not a sufficient character to establish genus membership. It was previously shown that Pseudobuliminus species from Shandong Province lack a dart sac and possess a flagellum. We found the same reproductive characteristics in additional species from eastern and northern China, such as P. buliminoides from Nanjing, Jiangsu Province, and Pseudobuliminus beijingensis n. sp., described herein from Fangshan, Beijing Province. In contrast, species from western China differ from this configuration by having a dart sac but lacking a flagellum. Based on partial sequences of the mitochondrial 16S rRNA and the nuclear spacer ITS2, our molecular phylogeny demonstrates that the species from eastern and northern China form a clade. We conclude that the combination of lack of a dart sac and presence of a flagellum is a morphological synapomorphy shared by the members of this taxonomic lineage.  

 

KEYWORDS: Beijing, Bradybaeninae, cladistics, Yanshan Mountains, synapomorphy

Shells of Pseudobuliminus beijingensis n. sp. type specimens.
A  Aperture, umbilicus and apex views of holotype. B Aperture, umbilicus and apex views of paratype SDNU.Gas.0397.01.02. C View of protoconch, smooth.

  

  Photographs of live specimens of Pseudobuliminus beijingensis n. sp. and its habitat.
A The mountain habitat where the species is found. B–C Living individuals on the tree. D The mating. E The probable host.

Pseudobuliminus beijingensis n. sp.

Distribution: Only known from the type locality, Bejing.

Etymology: The name is after Beijing, capital of the P.R. China.

Remarks: This species resembles Pseudobuliminus piligerus, P. buliminus buliminus and P. conoidius from western China. P. piligerus, P. buliminus and P. beijingensis n. sp. do not cluster together in molecular phylogeny, highlighting the homoplasy in shell shapes.

Guoyi Zhang and Xing-Xiao Wang. 2025. Polyphyly in A Morphologically defined Genus: Phylogeny and Morphology of Pseudobuliminus (Eupulmonata: Camaenidae) from eastern and northern China, with A Checklist of Species from mainland China. Molluscan Research. DOI: doi.org/10.1080/13235818.2025.2494894  [14 May 2025]

https://x.com/uiharunagaame/status/1922958536134287619

 

[Mollusca • 2025] Dicharax devraivasi • A New Micro-snail Species of the Genus Dicharax Kobelt & Möllendorff, 1900 (Caenogastropoda: Cyclophoridae: Alycaeinae), from sacred groves in the northern Western Ghats, India

 

 Dicharax devraivasi

Bhosale, Thackeray, Yadav & Khandekar, 2025

DOI: doi.org/10.61733/jconch/4543

 Researchgate.net/publication/390521141

 

Abstract

 We describe a new micro-snail species of the genus Dicharax based on 16 specimens collected from three sacred groves in Kolhapur District, in the northern Western Ghats of Maharashtra State, India. This species can be easily distinguished from its congeners in several non-overlapping morphological characters: R2 with closely spaced, blunt, elevated ribs; R3 with an inflated, blunt swelling; and basal part of the outer peristome (part close to the umbilicus) is more expanded than the rest of the outer peristome. We also describe and illustrate the living animal, operculum, radula, and jaw. This is the first report of the genus from the northern Western Ghats and extends its known geographic distribution in the Western Ghats by 370 km north. The new species highlights the importance of sacred groves as a biodiversity reservoir and emphasizes the need for in-depth investigations to uncover largely unknown biodiversity at these sites. We also discuss the need for systematic, fine-scale sampling in the northern Western Ghats to reveal mostly unknown land-snail diversity.

Key words. Biodiversity hotspot, Devrai, endemic, Dicharax devraivasi n. sp.,  taxonomy

Living snail of Dicharax devraivasi n. sp.
A, male, holotype NRC-AA-8454. B, female, paratype NRC-AA-8457. C, immature male (not collected) showing semitransparent shell. D, immature male, showing penis (at arrow).

Dicharax devraivasi n. sp.

Etymology. The specific epithet is used as a noun in apposition. It is derived from the Marathi word “devrai”, meaning “sacred grove”, and Sanskrit word “vasi”, meaning “inhabitant of”, as the new species has so far only been reported from multiple sacred grove forests in Kolhapur District, northern Western Ghats of Maharashtra. The suggested English common name is Devrai micro-snail.

Amrut Bhosale, Tejas Thackeray, Omkar Yadav and Akshay Khandekar. 2025. A New Micro-snail Species of the Genus Dicharax Kobelt & Möllendorff, 1900 (Caenogastropoda: Cyclophoridae: Alycaeinae), from sacred groves in the northern Western Ghats, India. Journal of Conchology. 45(3); DOI: doi.org/10.61733/jconch/4543  [5 April 2025]

 Researchgate.net/publication/390521141_A_new_micro-snail_species_of_the_genus_Dicharax_from_the_northern_Western_Ghats_India

[Mollusca • 2025] Clostophis udayaditinus • First Record of the Microsnail Genus Clostophis Benson, 1860 (Eupulmonata: Pupilloidea: Hypselostomatidae) from Cambodia, with Description of A New Species

Clostophis udayaditinus Sutcharit & Panha,

in Sutcharit, Thi, Chantha, Chourn, Sophea, Jeratthitikul, Pholyotha, Siriwut, Srisonchai et Panha, 2025. 

Journal of Conchology. 45(3); 

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Abstract

 Specimens of a new species of hypselostomatid microsnail, Clostophis udayaditinus Sutcharit & Panha, n. sp., were collected from the limestone hills area in Battambang Province, western Cambodia. Besides being a species new to science, this discovery represents a new country record for the genus. The new species differs from all other congeners by its concave-conical shell, with apertural dentition four in number, and hooked parietal and columellar lamellae. Living snails were found crawling on the walls in a cave, and the snails have a colourless, semitransparent soft body.

Key words. Angkor Kingdom, endemic species, limestone, pulmonates, taxonomy

Clostophis udayaditinus n. sp.  from the type locality.
A–C, paratype CUMZ 14466 of living snails crawling on wet tissue paper (three snails at different angles; all shell widths about 1.3 mm). D, light microscope image of paratype CUMZ 14467 with enlarged aperture at different angles.

 Abbreviations: c = columellar lamella, ip = infraparietal lamella, p = parietal lamella, pl = palatal plica.

Clostophis udayaditinus n. sp. from Battambang, Cambodia.
A, holotype CUMZ 14441 with enlarged aperture at different angles, and enlarged columellar lamella and palatal plica, and B, C, protoconch. D, paratype CUMZ 14446 from the type locality.

 Abbreviations: c = columellar lamella, ip = infraparietal lamella, p = parietal lamella, pl = palatal plica.

Family Hypselostomatidae Zilch, 1959 

Clostophis Benson, 1860

 Type species. Clostophis sankeyi Benson, 1860, by monotypy. 

Remarks. Until now, the genus Clostophis has been known to be widely distributed from Peninsular Malaysia to Myanmar, mainland Indochina, and southern China (Páll-Gergely et al. 2020; Páll-Gergely & Hunyadi 2022; MolluscaBase Eds 2024). There are 20 species known from Cambodia, including the new species, described here.

Clostophis udayaditinus Sutcharit & Panha, n. sp. 

Diagnosis. Shell concave-conical, with long, descending tuba and expanded peristome. Apertural dentition four: consisting of one hooked parietal lamella, one small infraparietal lamella, one large, strong palatal plica, and one hooked columellar lamella. Umbilicus wide.

Etymology. The species name udayaditinus is from “udayadit-”, and the suffix “-inus”, meaning possession or belonging to. This name is a memorial to King Udayadityavarman II, who ruled the Angkor Kingdom around 1100 A.D. He also ordered the building of the Bannan Temple (Higham 2014), which became the name of the hill—the type locality of this new species.

Chirasak Sutcharit, Sothearen Thi, Nasak Chantha, Phyroum Chourn, Chhin Sophea, Ekgachai Jeratthitikul, Arthit Pholyotha, Warut Siriwut, Ruttapon Srisonchai and Somsak Panha. 2025. First Record of the Microsnail Genus Clostophis Benson, 1860 (Eupulmonata: Pupilloidea) from Cambodia, with Description of A New Species. Journal of Conchology. 45(3); DOI. doi.org/10.61733/jconch/4538  [23 February 2025] 

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[Mollusca • 2025] Calybium plicatus • The Second Calybium Morlet, 1892 (Neritimorpha: Helicinoidea: Helicinidae), and the first record of the Genus for Vietnam’s Terrestrial Gastropod Fauna

Calybium plicatus

Hoang, Vu, Tran, Nguyen & Do, 2025

DOI: doi.org/10.35885/ruthenica.2025.35(1).4 

Abstract

This paper described the second species of the genus Calybium Morlet, 1892, Calybium plicatus sp. nov. was collected in Son Doong Cave, Phong Nha–Ke Bang National Park, Quang Binh Province, Central Vietnam. Calybium plicatus sp. nov. has a similar shell shape to Calybium massiei Morlet, 1892 but differs in having a smaller shell size, the parietal wall with six evenly spaced parietal lamellae. This discovery represents the first report of the genus Calybium in Vietnam.

Calybium plicatus sp. nov. Holotype VNMN-IZ 000.002.347.
A–D. Shell morphology (apertural view, dorsal view, ventral view, and side view).
E–F. Details of the apertural dentition.

Photos: Nguyen T.S. and Do D.S.

Class Gastropoda Cuvier, 1795

Subclass Neritimorpha Cox, 1960

Order Cycloneritida Frýda, 1998

Superfamily Helicinoidea Férussac, 1822

Family Helicinidae Férussac, 1822

Subfamily Vianinae Baker, 1922

Calybium Morlet, 1892

Calybium plicatus sp. nov.

 

Diagnosis. Shell medium-sized, depressed coni-cal, and sharply keeled body whorl; the calcareous layer on the dorsal side is coarse, strongly undulated and forms evenly spaced domes protruding from the shell surface; parietal wall with six lamellae, of which the sixth very long, curved, and close to the suture; palatal wall with a barrier-shaped lamella that ...

Etymology. The species’ name is derived from its characteristic apertural dentition, from the Latin word ‘plicatus’, meaning ‘lamellae’ that are present at the parietal wall.

 

Calybium plicatus sp. nov. 
A, B. Habitat picture, from the type locality at Doline 1 of Son Doong Cave, Bo Trach District, Quang Binh Province. C. Photo of the new species in habitat.

Photos: Vu V.L. (A, B), Hoang N.K. (C).

Ngoc Khac Hoang, Van Lien Vu, Thi Thanh Binh Tran, Thanh Son Nguyen and Duc Sang Do. 2025. Description of the second Calybium Morlet, 1892, and the first record of the Genus for Vietnam’s Terrestrial Gastropod Fauna (Neritimorpha: Helicinoidea: Helicinidae). Ruthenica, Russian Malacological Journal. 35(1); 39–45. DOI: doi.org/10.35885/ruthenica.2025.35(1).4 

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[Mollusca • 2025] Shinkailepas tiarasimia & S. cornuthauma • Integrative Taxonomy of New neritimorph Limpets (Gastropoda: Neritimorpha: Phenacolepadidae) from Indian Ocean Deep-sea Hot Vents shed light on their Biogeographic History

 

Shinkailepas cornuthauma

Gu, Chen, Gao, Zhou & Sun, 2025 

 

DOI: doi.org/10.1093/zoolinnean/zlae167   

  Researchgate.net/publication/387689752

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Abstract

Red-blooded neritimorph gastropods in the subfamily Shinkailepadinae are specialists of chemosynthesis-based ecosystems, with the most diverse genus Shinkailepas endemic to deep-sea hydrothermal vents. All described Shinkailepas species have so far been from the western Pacific, despite reports of unidentified Shinkailepas from the Indian Ocean in the literature for decades. Here, we use an integrative approach to characterize and describe these Indian Ocean vent neritimorphs for the first time, based on material collected from the Carlsberg Ridge (CR) and the Central Indian Ridge (CIR). We name two new species: Shinkailepas tiarasimia sp. nov. from both the CR and the CIR, and Shinkailepas cornuthauma sp. nov. from the CR. A combination of shell and epipodial lobe characters reliably separate these new species from their described congeners. A phylogenetic reconstruction of all known Shinkailepas species using 658 bp of the mitochondrial COI gene reveal two separate major clades within the genus, each with an Indian Ocean species—implying two independent colonizations of Indian Ocean vents by separate lineages. Our finding of two new species on the CR, including one not known anywhere else, underscores the unique biodiversity at these vents and strengthens the case for protecting them from potential deep-sea mining activities.

biodiversity, biogeography, COI mtDNA, Gastropoda, Indian Ocean, new species, phylogenetics, taxonomy

 

 

Xinyu Gu, Chong Chen, Kexin Gao, Yadong Zhou and Jin Sun. 2025. Integrative Taxonomy of New neritimorph Limpets from Indian Ocean Deep-sea Hot Vents shed light on their Biogeographic History. Zoological Journal of the Linnean Society. 203(1); zlae167. DOI: doi.org/10.1093/zoolinnean/zlae167  

   Researchgate.net/publication/387689752_Integrative_taxonomy_of_new_neritimorph_limpets_from_Indian_Ocean_deep-sea_hot_vents 

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