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RESEARCH ARTICLE

Molecular phylogeny of the land snail family Euconulidae in Thailand and its position in the superfamily Trochomorphoidea (Stylommatophora: Limacoidei), with description of a new genus

Arthit Pholyotha https://orcid.org/0000-0001-6677-1164 A , Somsak Panha A B , Chirasak Sutcharit A , Parin Jirapatrasilp A , Teerapong Seesamut A C , Thor-Seng Liew D and Piyoros Tongkerd https://orcid.org/0000-0001-9221-9293 A *
+ Author Affiliations
- Author Affiliations

A Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

B Academy of Science, The Royal Society of Thailand, Bangkok 10330, Thailand.

C Department of Biology, Faculty of Science, Rangsit University, Pathum Thani 12000, Thailand.

D Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia.

* Correspondence to: piyorose@hotmail.com

Handling Editor: Manuel Malaquias

Invertebrate Systematics 37(8) 571-605 https://doi.org/10.1071/IS23012
Submitted: 22 March 2023  Accepted: 9 August 2023   Published: 8 September 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

The Euconulidae is a globally distributed land snail family but there is no record of this family from Thailand. In this study, we describe a new genus, Siamoconus gen. nov., based on comparative studies of the shell characteristics, external morphology of animals, radula, genital and spermatophore structures, and molecular phylogeny. We performed phylogenetic analyses of two mitochondrial gene fragment (cytochrome c oxidase I, COI; and 16S rRNA) and one nuclear (28S rRNA) gene fragment to clarify the relationships with other euconulid genera and its position in the superfamily Trochomorphoidea. We also analysed shell morphometrics, male genitalia and mantle pigmentation of Siamoconus gen. nov., confirming the status of three new species with keeled shells (S. boreas sp. nov., S. coleus sp. nov. and S. geotrochoides sp. nov.) and one new species with a rounded shell (S. destitutus sp. nov.). These new species are restricted to limestone areas in northern and north-eastern Thailand. We also re-examined the status of other genera in the superfamily Trochomorphoidea based on shell features, body pigmentation, radula, genital anatomy, spermatophore morphology, and a phylogenetic analysis of all available trochomorphoidean DNA sequences. Our analysis suggests that the family Geotrochidae, previously synonymised with the Trochomorphidae, should be resurrected to represent the genus Geotrochus from Borneo, and this family is retrieved as the sister clade of the Dyakiidae.

ZooBank: urn:lsid:zoobank.org:pub:C5205F4E-5DDE-42E6-A532-761CAFE099C3

Keywords: land snail, limestone, Mainland South-East Asia, new genus, new species, phylogeny, systematics, taxonomy.


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