Three new species of the carnivorous snail genus Perrottetia Kobelt, 1905 from Thailand (Pulmonata, Streptaxidae)

Somsak Panha,Thanit Siriboon,Fred Naggs,Chirasak Sutcharit

doi:10.3897/zookeys.287.4572

Abstract

Three new species of the streptaxid snail genus Perrottetia are described from north and northeastern Thailand, Perrottetia aquilonaria sp. n., Perrottetia dermapyrrhosa sp. n. and Perrottetia phuphamanensis sp. n. Each species is endemic to a single or a few limestone mountain ranges. The species are characterized by the morphology of their genital organs, as well as by shell characters. Perrottetia aquilonaria sp. n. has a club shaped distal penis and large penial hooks are present and penial papillae cover almost the entire penial hook portion; adjacent areas possess low reticulated folds. Perrottetia dermapyrrhosa sp. n. has a long genital atrium and the penial sheath is about two-thirds of the penis length. Penial hooks are long, scattered and sunken into deep ovate hollows; vaginal hooks are present. Perrottetia phuphamanensis sp. n. has a rounded and protruded shell periphery. The aperture is subcircular, peristome is thick and the second parietal lamella is adjacent to the first parietal lamella; a basal lamella is the smaller than in the other Thai species.

Highlights

Terrestrial gastropods are primarily herbivores and only a few groups are carnivorous
Prior to Schileyko’s revision only two subfamilies, the Streptaxinae and the Enneinae had been recognized, which were primarily based on their shell morphology (Zilch 1960, Richardson 1988)
The Streptaxinae sensu Schileyko is composed of Perrottetia and 20 additional genera with discontinuous distribution patterns in South America, some Indian Ocean Islands, including the Mascarines and Seychelles, South and Southeast Asia and the Philippines

Summary

Introduction

Terrestrial gastropods are primarily herbivores and only a few groups are carnivorous. The characters of the genitalia, in particular those proximal to the genital orifice, have proved as useful tools for species recognition, and often can serve for the differentiation on the generic level in many streptaxids groups (Stoliczka 1871, Berry 1963, Sutcharit et al 2010). These characters were examined in the current investigation. Three new species of the carnivorous snail genus Perrottetia Kobelt, 1905 from Thailand... 43

Material and methods

Discussion