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

By

Čhirasak Sutčharit
Somsak Panhā‏

Type

Article

Date of Publication

2021

Original Publication

ZooKeys

Volume

1047

Pages

101--154

Subjects

Conservation , edible snails , lectotype , Southeast Asia , taxonomy type specimen

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1047.65735

 

Abstract

The genusHemiplectais a group of large-sized land snails which have long been used as a food resource by Indochinese people. There are five dextral and four sinistral species currently recognized from Thailand. The dextral group is comprised of two previously recorded species (H. humphreysianaandH. distincta), two newly recorded species (H. funereaandH. esculenta), and one new species (H. nemorosasp. nov.) from northern Thailand is being proposed. We reassessed the diagnostic characters of the genitalia, mantle edge, and radula. Specimens were classified into the genusHemiplectaon the basis of the penial verge and shell lobe, and on the characters of a bulbous gametolytic sac without a gametolytic duct. A complete species list, together with photographs of the name-bearing types or authenticated specimens and the taxonomic status ofHemiplectas.l. that are known from Indochina including Peninsular Malaysia and Myanmar, is provided for the first time. In total, this species list contains 39 available nominal species names described from this area. Type or authentic specimens can be located for 37 nominal species names, of which 25 are illustrated herein and the other 12 were recently illustrated. However, two available species-level names could not be traced to any type specimens. In addition, lectotypes ofH. funereaandH. plutoare designated herein to stabilize the names.