Annotated checklist of the land snail fauna from southern Cambodia (Mollusca, Gastropoda)

Abstract

Prior to this study, few collections and records were made of the land snails in Cambodia and the historical taxa had never been reviewed. Herein a report on the land snail diversity based on specimens collected recently from karstic and non-karstic areas in southern Cambodia is provided. This checklist presents 36 species of land snails (two Neritimorpha, six Caenogastropoda, and 28 Heterobranchia). Illustrations and brief taxonomic notes/remarks are provided for every species. We also described Georrisa carinata Sutcharit & Jirapatrasilp, sp. nov. based on some distinct shell morphological characters. Since the first descriptions during the colonial period in the nineteenth century, some land snail species (e.g., Trichochloritis norodomiana, Durgella russeola, Anceyoconcha siamensis obesulacomb. nov., Anceyoconcha chaudoensiscomb. nov., and Succinea tenuis) have not been reported subsequently. This probably reflects a lack of knowledge concerning land snail biodiversity in this country. To our knowledge, this is the first comprehensive survey of land snails in southern Cambodia. A need for more field research and systematic revision of the land snails in this interesting region is also highlighted and demonstrated.

Reassessment and systematic position of the sinistral snails of genus Hemiplecta from Thailand (Eupulmonata: Ariophantidae), with description of two new species

“…Remarks. This new species is mainly distributed in the eastern part of Thailand in Chanthaburi and Trat Provinces, and probably in the Cardamom Mountains of Cambodia (Sutcharit et al, 2020). Hemiplecta thailandica n. sp.…”

“…The exception is H. thailandica n. sp., which is restricted to Indochina (Eastern Thailand) and probably in Cambodia (Sutcharit et al, 2020); this could be attributed to allopatric speciation. This close relationship between the Malay Peninsula and Indochina populations has been similarly reported in various land snail groups and also in other animals, including butterflies and centipedes (Muadsub & Pinkaew, 2014;Siriwut et al, 2015).…”

Systematic revision of the limestone karst-restricted land snail genus Aenigmatoconcha (Eupulmonata: Helicarionidae), with description of a new species

“…No additional specimen records or literature references are available for this species until now. The most recent works on land snails from Laos and southern Cambodia confirmed the existence of A. mitis (Inkhavilay et al 2019;Sutcharit et al 2020c). Based on the recorded itinerary, H. Mouhot had travelled to "Pechaburi" [Petchaburi Province] in 1861, and clearly stated that he had visited caves and several hills during his four-month stay (Mouhot 1864: 57;Ashburton 1864: map).…”

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

“…Three nominal species, Helix crossei Pfeiffer, 1862, Helix danae Pfeiffer, 1863a and Helix weinkauffiana Crosse & Fischer, 1863, were synonymized and relocated either to Quantula Baker, 1941 or Phuphania Tumpeesuwan et al, 2007(Godwin-Austen 1891Laidlaw 1931Laidlaw , 1933Hausdorf 1995;Schileyko 2002;Jirapatrasilp et al 2020). Two other nominal species, Helix siamensis Pfeiffer, 1856a and Hemiplecta dichromatica Morlet, 1889, were found to possess genitalia with a long gametolytic duct (Maneevong 2000;Boonmachai and Nantarat 2020;Sutcharit et al 2020;Pholyotha et al 2021), suggesting that they should be reclassified into the genus Cryptozona Mörch, 1872. Therefore, for Thai species, only four dextral species, H. humphreysiana (Lea, 1840), H. distincta, H. neptunus (Pfeiffer, 1861) and H. zimmayensis Godwin-Austen, 1888, and four sinistral species are retained in this genus.…”