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| A Hemiplecta humphreysiana from Singapore; B Hemiplecta distincta from Saraburi, Thailand; D, E Hemiplecta funerea from Nan, Thailand D yellow shell form and E dark shell form; F Hemiplecta esculenta from Chiang Mai, Thailand; |
Abstract
The genus Hemiplecta is 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. humphreysiana and H. distincta), two newly recorded species (H. funerea and H. esculenta), and one new species (Hemiplecta nemorosa sp. nov.) from northern Thailand is being proposed. We reassessed the diagnostic characters of the genitalia, mantle edge, and radula. Specimens were classified into the genus Hemiplecta on 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 of Hemiplecta s.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 of H. funerea and H. pluto are designated herein to stabilize the names.
Keywords: Conservation, edible snails, lectotype, Southeast Asia, taxonomy type specimen
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| Living snail. A Hemiplecta humphreysiana from Singapore (width about 45 mm) B, C Hemiplecta distincta B from Saraburi, Thailand (width about 65 mm) and C mating pairs D, E Hemiplecta funerea from Nan, Thailand (width about 50 mm) D yellow shell form and E dark shell form (width about 50 mm) F Hemiplecta esculenta from Chiang Mai, Thailand (width about 30 mm). |
Chirasak Sutcharit and Somsak Panha. 2021. 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. ZooKeys. 1047: 101-154. DOI: 10.3897/zookeys.1047.65735
