Aenigmatoconcha sumonthai, a new helicarionid land snail from Chumphon Province, Southern Thailand (Helicarionidae: Durgellinae)

Digital Gems > Biodiversity Library of Southeast Asia

Language

English

Creator

Tumpeesuwan, C.
Tumpeesuwan, S.

Source Title

The Raffles Bulletin of Zoology

Publication date

2018/03/19

Publisher

Dept. of Zoology, National University of Singapore, Singapore

Page

170–176

Content Type

Journal Article

Object Type

Text

Terms of Use

Open Access

Access Status

Open

Repository

NUS Libraries

Start File Page

170

End File Page

176

Volume

66

Issue

1

Call Number

QL319 NMB

Subject

Snails -- Thailand -- Classification
Snails -- Thailand -- Identification

Keyword

Aenigmatoconcha
mantle shell lobes
radula
karst
endemic taxa
disjunct distribution
snails

Abstract

Aenigmatoconcha sumonthai, new species, is described from Tham Chang Phueak, a limestone range in Chumphon province, southern Thailand. The external morphology of the shell and soft parts, the genital system, and radula morphology were examined and compared with the type species of the genus, A. clivicola C. Tumpeesuwan & S. Tumpeesuwan, 2017 from northeastern Thailand. Externally the new species differs from A. clivicola in having a smaller shell, presence of black bands from the base of the long tentacles to the mantle edge, and both mantle shell lobes have numerous tiny white spots and irregular black marbling. The radula comprises approximately 22–35 transverse v-shaped rows of teeth, with each row having 11–150 unicuspid spatulated teeth. In the genital system, the penis is longer than the epiphallus and the base of the gametolytic sac is longer than the middle part.

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