Hydrobioides avarix Annandale 1918

Hydrobioides avarix Annandale, 1918 Hydrobioides avarix Annandale, 1918: pl. 14, figs 1, 2, 2 a, 2 b, 2 c (Myanmar, Shan State, NW shore of Inle Lake, a stream near Fort Stedman, now Maing Thauk). Material examined. • 3 probable syntypes (preserved dry), Inle Lake, South Shan, Burma. “ Ex. India Museum ”, NHMUK.20060143. Remarks. We did not discover this species during our fieldwork and only examined three probable syntypes. The detailed descriptions of shell, operculum, radula, and male genitalia of this species have been given by Annandale (1918). This species can be distinguished from Hydrobioides nassa by more inflated whorls and a simple outer lip without the varix structure nearby. It can be distinguished from Gabbia nana comb. nov. based on a larger and thinner shell with less inflated whorls and an operculum, which is much smaller than the aperture. The validity and genus assignment of this species need further study based on fresh specimens.