Reassessment and phylogenetic position of the overlooked limacoid land snail Trochomorpha sculpticarina Martens, 1883 (Eupulmonata, Ariophantidae), with the description of a new genus

By

Pholyotha, Arthit
Čhirasak Sutčharit
Somsak Panhā‏
Tongkerd, Piyoros

Type

Article

Date of Publication

2024-8-14

Original Publication

Zoosystematics and evolution

Volume

100

Series / Issue

Issue: 3

Pages

1135--1154

Subjects

Helicarionoidea , Land snails , Malay Peninsula , Phylogeny , systematics , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia Pensoft

Identifiers

DOI: https://doi.org/10.3897/zse.100.129455

 

Abstract

The Malay Peninsula has traditionally been considered to harbour a diverse land-snail fauna, both in terms of a high species richness and a wide variety of conchological traits, especially within the limacoid land snails. A recent survey along the Malay Peninsula of southern Thailand discovered an overlooked limacoid taxon “Trochomorpha” sculpticarina Martens, 1883, previously assigned to genus Trochomorpha of the Trochomorphidae. This genus is herein described as Janbinmorphagen. nov. based on comparative studies of shell morphology, external features, genital anatomy and radular morphology, as well as analyses of partial sequences of two mitochondrial markers, COI and 16S rRNA, and of one nuclear marker, 28S rRNA. This new genus is characterised by a combination of distinct morphological and anatomical features. The most distinguishing features are a depressed trochiform shell with a keeled last whorl, gametolytic organ without a duct, gametolytic sac with two lobes, and proximal epiphallus encircled with a thick sheath and attached by the penial retractor muscle. In addition, an analysis of the differentiation in mitochondrial and nuclear markers confirmed that this new genus, first recognised by morphology, is also genetically distinct. The molecular data also confirm that J. sculpticarinacomb. nov. is a member of the Ariophantidae and has a close evolutionary relationship to Hemiplecta and Maelamaodiscus.