Chromosome Study of fourteen Land Pulmonate Snails in Thailand (Pulmonata: Achatinidae, Succineidae, Helicarionidae, Ariophantidae)(Thai)

Abstract

Fourteen species of land snails belonging to four families; Achatinidae, Succineidae, Helicarionidae and
Ariophantidae, from several parts of Thailand have been studied. All of them had chromosome numbers ranging from n = 24 to n = 33. In the family Achatinidae, Achatina fulica Bowdich, showed the haploid number
n = 31. For the family Succineidae, only one species, Succinea sp., was examined. The haploid chromosome
number was n = 24. All of seven genera and eleven species in family Ariophantidae, Cryptozona siamensis
Pfeiffer, Hemiplecta distincta Pfeiffer, H. weinkauffiana Crosse and Fischer , Macrochlamys asamurai Panha
, Macrochlamys sp. 1, Macrochlamys sp. 2, Macrochlamys sp. 3, Syama diadema Dall, Dyakia salangana Martens
, Megaustenia siamensis Haines and Durgella libas Solem had the same chromosome number, n = 33, while in the family Helicarionidae, Ryssota Lamarckiana Lea, had 29 haploid chromosomes.