Exploring the Almost Unknown Trochomorpha (Eupulmonata: Trochomorphidae) from Laos, with Description of Three New Species


  • Khamla Inkhavilay Research Academic and Service Office, National University of Laos, Vientiane, LAOS
  • Chirasak Sutcharit Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND
  • Arthit Pholyotha Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND


diversity, Indochina, land snail, morphology, taxonomy, Trochomorpha


Terrestrial malacofauna in Laos is expected to comprise a large number of species because the country has a large variety of suitable habitats for snail colonization and diversification. The genus Trochomorpha, which exhibits a depressed trochiform shell, is a group of Laotian terrestrial snails for which much is still to be discovered. This study was based on historical records and the recent land snail collections obtained from Laos during 2013–2014. Our results uncovered seven species in Laos based on their distinct shell morphological characters. These comprise four nominal species (T. benigna, T. paviei, T. albofilosa, and T. thachi) and three new species (T. buotia sp. nov., T. speirofascia sp. nov., and T. somsakpanhai sp. nov.). Additionally, the geographic distribution of Trochomorpha species in Laos, except T. benigna, and photos of type specimens of the Indochinese Trochomorpha species are provided.


Albers, J.C. 1850. Die Heliceen nach natürlicher Verwandtschaft systematisch geordnet. Berlin: Enslin, 262 pp. https://www.bio diversitylibrary.org/page/11965983

Albers, J.C. 1860. Die Heliceen nach natürlicher Verwandtschaft systematisch geordnet von Joh. Christ. Albers. Zweite Ausgabe. Leipzig: Engelman. [original manuscript of Albers edited and published by Martens]. https://doi.org/10.5962/bhl.title.11218

Baker, H.B. 1941. Zonitid snails from Pacific islands. Part 3 and 4. Bernice P. Bishop Museum Bulletin, 166: 203–370. http://hbs.bishopmuseum.org/pubs-online/pdf/bull166.pdf

Bavay, A. and Dautzenberg, P. 1909a. Molluscorum terrestrium Tonkinorum diagnoses. Journal de Conchyliologie, 56(4): 229–251.

Bavay, A. and Dautzenberg, P. 1909b. Description de coquilles nouvelles de ľIndo-Chine. Journal de Conchyliologie, 57(2): 81–105.

Crosse, H. 1867. Description ďespèces nouvelles de Cochinchine. Journal de Conchyliologie, 15: 204–209. https://biodiversity library.org/page/15382136

Dautzenberg, P. and Fischer, H. 1905. Liste des Mollusques récoltés par M. le Capitaine de Frégate Blaise au Tonkin et description ďespèces nouvelles. Journal de Conchyliologie, 53 (2): 85–234.

Dautzenberg, P. and Fischer, H. 1908. Liste des Mollusques récoltés par M. Mansuy en Indo-Chine et description ďespèces nouvelles. II. Journal de Conchyliologie, 56 (3): 169–217.

Delsaerdt, A.G.J. 2016. Land snails on the Solomon Islands. Vol. III. Trochomorphidae and systematical review of all other families. Ancona: ĽInformatore Piceno, 160 pp.

Fischer, P. 1891. Catalogue et distribution gèographique des Mol-lusques terrestres, fluviatilies & marins ďune partie de ľIndo-Chine (Siam, Laos, Cambodge, Cochinchine, Annam, Tonkin). Autun: Imprimerie Dejussieu Père et Fils, 192 pp.

Fischer, P.H. 1973. Les mollusques testaces du Cambodge. Seconde partie: Gastéropodes Pulmonés, bivalves et biblio-graphie. Journal de Conchyliologie, 90: 89–113.

Fischer, H. and Dautzenberg, P. 1904. Catalogue des mollusques terrestres et fluviatiles de ľIndo-Chine orientale cites jusqu’ à ce jour. In: Mission Pavie, Etudes diverses, III.

Fischer-Piette, E. 1950. Liste des types décrits dans le Journal de Conchyliologie et conservés dans la collection de ce journal. Journal de Conchyliologie. 90: 149–180.

Férussac, A.E.J.P.F. ďAudebard de. 1821 [1821–1822]. Tableaux systématiques des animaux mollusques suivis ďun Prodrome général pour tous les mollusques terrestres ou fluviatiles vivants ou fossils. Première partie, Tableaux systématiques généraux, pp. i–xlvii. Deuxième partie, Tableaux particuliers des mollusques terrestres et fluviatiles, Classe des Gastéropodes. Paris: Arthus-Bertrand, 114 pp.

Garrett, A. 1884. The terrestrial Mollusca inhabiting the Society Islands. Journal of the Academy of Natural Sciences of Philadelphia, 9: 17–114. https://biodiversitylibrary.org/page/ 12906681

Godwin-Austen, H.H. 1895. Notes on Trochonanina and other genera of land Mollusca, with reference to the generic position of Martensia mozambicensis and other species. Journal of Molluscan Studies, 1(6): 281–287. https://doi.org/10.1093/ oxfordjournals.mollus.a064134

Gude, G.K. 1914. Mollusca II (Trochomorphidae–Janellidae). In: Shipley, A.E. and Marshall, G.A.K. (Eds). The Fauna of British India, including Ceylon and Burma. London: Taylor and Francis, 520 pp.

Gupta, A. 2005. Landforms of Southeast Asia. In: Gupta, A. (Ed.). The Physical Geography of Southeast Asia. New York: Oxford University Press, 38–64.

Heude, P.M. 1890 [1882–1890]. Notes sur les mollusques terrestres de la vallée du Fleuve Bleu. Mémoires de ľ Histoire Naturelle de ľ Empire Chinois, 1(4): 125–188. https://www.biodiver sitylibrary.org/page/34061405

Inkhavilay, K., Sutcharit, C., Bantaowong, U., Chanabun, R., Siriwut, W., Srisonchai, R., Pholyotha, A., Jirapatrasilp, P. and Panha, S. 2019. Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda). ZooKeys, 834: 1–166. https://doi.org/10.3897/zookeys.834.28800

King, B.F., Woodcock, M. and Dickinson, E.C. 1975. A Field Guide to the Birds of South-East Asia. London: Collins.

Mabille, J. 1887a. Molluscorum Tonkinorum diagnoses. Meulan (Seine-Oise), 18 pp.

Mabille, J. 1887b. Sur quelques mollusques du Tonkin. Bulletins de la Société Malacologique de France, 4: 73–164.

Marzuki, M.E., Liew, T.-S. and Mohd-Azlan, J. 2021. Land snails and slugs of Bau limestone hills, Sarawak (Malaysia, Borneo), with the descriptions of 13 new species. ZooKeys, 1035: 1–113. https://doi.org/10.3897/zookeys.1035.60843

Möllendorff, O.F. von. 1901. Diagnosen neuer von H. Fruhstorfer in Tongking gesammelter Landschnecken. Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft, 33 (5–8): 65–81, 110–119. https://www.biodiversitylibrary.org/page/15598608

MolluscaBase, 2022. MolluscaBase. Trochomorpha Albers, 1850. Available from https://www.molluscabase.org/aphia.php?p= taxdetails&id=818615 [Accessed 25 June 2022].

Morlet, L. 1885. Description d'espèces nouvelles de coquilles recueillies par M. Pavie au Cambodge. Journal de Conchy-liologie, 32[1884]: 386–403. [Published in parts, dates follow Fischer-Piette (1937)] https://biodiversitylibrary.org/page/1607 2179

Morlet, L. 1889. Catalogue des coquilles recueillies, par M. Pavie, dans le Cambodge et le Royaume de Siam, et description ďespèces nouvelles. Journal de Conchyliologie, 37: 121–199. https://biodiversitylibrary.org/page/16015483

Myers, N., Mittermeier, R.A., Mittermeier, C.G., da Fonseca, G.A.B. and Kent, J. 2000. Biodiversity hotspots for conser-vation priorities. Nature, 403: 853–858. https://doi.org/10.10 38/35002501

Páll-Gergely, B., Hunyadi, A. and Auffenberg, K. 2020. Taxono-mic vandalism in malacology: comments on molluscan taxa recently described by N. N. Thach and colleagues (2014–2019). Folia Malacologia, 28(1): 35–76.

Pfeiffer, L. 1842a. Description de deux mollusques nouveaux, découverts par M. Perrotet sur le plateau des Neelgherries. Revue Zoologique par la Société Cuvierienne, 1842: 304-305. https://www.biodiversitylibrary.org/page/14714835

Pfeiffer, L. 1842b. Symbolae ad historiam Heliceorum, Part II. Kassel. 147 pp. https://www.biodiversitylibrary.org/page/1225 4177#page/134/mode/1up

Pfeiffer, L. 1863. Descriptions of thirty-six new land shells from the collection of H. Cuming, Esq. Proceedings of the Zoological Society of London, 30[1862]: 268–278. [Published in parts, dates follow Duncan (1937)]

Pholyotha, A., Sutcharit, C., Thach, P., Chhuoy, S., Ngor, P.B. and Panha, S. 2020. Land snail genus Sarika Godwin-Austen, 1907 (Eupulmonata: Ariophantidae) from Cambodia, with descrip-tion of three new species. European Journal of Taxonomy, 674: 1–21. https://doi.org/10.5852/ejt.2020.674

Pholyotha, A., Sutcharit, C., Lin, A. and Panha, S. 2022. Multigene phylogeny reveals the ribbed shell morphotypes in the land snail genus Sarika (Eupulmonata: Ariophantidae), with description of two new species from Thailand and Myanmar. Contributions to Zoology, 91: 97–132. https://doi.org/10.1163/ 18759866-bja10027

Schileyko, A.A. 2002. Treatise on Recent terrestrial pulmonate molluscs. Part 8. Punctidae, Helicodiscidae, Discidae, Cysto-peltidae, Euconulidae, Trochomorphidae. Ruthenica, Supple-ment 2: 1035–1166.

Schileyko, A.A. 2011. Check-list of land pulmonate molluscs of Vietnam (Gastropoda: Stylommatophora). Ruthenica, 21: 1–68.

Solem, A. 1959. Systematics and zoogeography of the land and fresh-water Mollusca of the New Hebrides. Fieldiana Zoology, 4(3): 1–359. https://www.biodiversitylibrary.org/page/2773210

Stoliczka, F. 1873. On the land-shells of Penang Island, with descriptions of the animals and anatomical notes; part second, Helicacea. Journal of the Asiatic Society of Bengal, 42: 11–38.

Sutcharit, C. and Panha, S. 2021. Systematic review of the dextral Hemiplecta Albers, 1850 (Eupulmonata, Ariophantidae) from Thailand with description of a new species and list of all the Indochinese species. ZooKeys, 1047: 101–154. https://doi.org/ 10.3897/zookeys.1047.65735

Sutcharit, C., Thach, P., Chhuoy, S., Ngor, P.B., Jeratthitikul, E., Siriwut, W., Srisonchai, R., Ng, T.H., Pholyotha, A., Jirapatrasilp, P. and Panha, S. 2020. Annotated checklist of the land snail fauna from southern Cambodia (Mollusca, Gastro-poda). ZooKeys, 948: 1–46. https://doi.org/10.3897/zookeys. 948.51671

Thach, N.N. 2018. New shells of South Asia seashells-freshwater & land snails, 3 new genera, 132 new species & subspecies. Akron, Ohio, USA: 48HRBooks Company, 173 pp.

Thach, N.N. 2020. New shells of South Asia. Volume 2. Seashells, Freshwater, Land snails. With one New Genus and 140 New Species & Subspecies, Reply to comments made in error. Akron, Ohio, USA: 48HRBooks Company, 189 pp.

Thiele, J. 1931 [1929–1935]. Handbuch der systematischen Weich-tierkunde. Erster Band, Tiel 2, Gastropoda: Ophisthobranchia and Pulmonata [English translation: Bieler & Mikkelsen (1992–1998)]. Gustav Fischer Verlag, Jena.

Vermeulen, J.J. and Liew, T.-S. 2022. Land snails and slugs of Sabah and Labuan (Malaysia). Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia. 432 pp.

Vaught, K.C. 1989. A classification of the living Mollusca. In: Abbott, R.T. and Boss, K.J. (Eds). Melbourne: American Mala-cologists, 189 pp.

Zilch, A. 1959. Gastropoda, Euthyneura. In: Schindewolf, O.H. (Ed.). Handbuch der Paläozoologie, Band 6, Gastropoda. Berlin: Gebrüder Borntraeger, 834 pp.




How to Cite

Inkhavilay, K. , Sutcharit, C. and Pholyotha, A. 2023. Exploring the Almost Unknown Trochomorpha (Eupulmonata: Trochomorphidae) from Laos, with Description of Three New Species. Tropical Natural History. 7 (May 2023), 93–106.



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