Acinolaemus Thompson & Upatham, 1997

Tongkerd, Piyoros, Lwin, Ngwe, Pall-Gergely, Barna, Chanabun, Ratmanee, Pholyotha, Arthit, Prasankok, Pongpun, Seesamut, Teerapong, Siriwut, Warut, Srisonchai, Ruttapon, Sutcharit, Chirasak & Panha, Somsak, 2024, Contributions of a small collection of terrestrial microsnails (Pupilloidea, Hypselostomatidae) from Myanmar with description of three new species, ZooKeys 1195, pp. 157-197 : 157

Genus Acinolaemus Thompson & Upatham, 1997

Acinolaemus Thompson & Upatham, 1997: 223, 224. Panha and Burch 2005: 39.

Type species.

Acinolaemus ptychochilus Thompson & Upatham, 1997, by original designation.

Remarks.

The general shell characteristics of this genus, such as shell form, with or without tuba, and ascending to descending aperture, are similar to the other Southeast Asian hypselostomatid genera.

This genus has similar shell form, protoconch sculpture, tuba shape, and aperture opened (ascending or descending), making it congruent with those of other Southeast Asian hypselostomatid genera. Since only the shell morphology has been published so far, the systematic relationship with its confamilials remains unknown and needs further study. In the meantime, Acinolaemus can be distinguished from other genera in having a small size (height 1-2 mm), enlarged and conspicuous angular lamella, prominent posterior corner balloon-shaped by angular lamella and upper palatal plica. Moreover, the two species known from Myanmar are characterised by a teleoconch sculpture with a pattern of rectangular, malleated pitting, crossed by spiral and radial ridges.

Currently, ten nominal species of the genus are known to occur in Thailand and the Mekong Delta and in limestone areas of Cambodia and Vietnam ( Changlom et al. 2019; MolluscaBase 2023). The two species reported here represent the first records of the genus Acinolaemus in Myanmar.