Genus Aulacospira Moellendorff, 1890

Aulacospira Möllendorff 1890: 224; Páll-Gergely et al. 2019.

Micropetasus Möllendorff 1890: 224, as section Aulacospira; type species: Helix scalatella Möllendorff, 1888.

Type species.

Helix scalatella Möllendorff, 1888 by subsequent designation (Pilsbry 1895 in 1894-1895).

Diagnosis.

Shell small (H = 1.5 mm, W = 2.9 mm), helicoid, depressed or triangular, wider than high. Color uniformly brown or purplish. Apex prominent; protoconch smooth or with dense mesh of granular reticulation. Teleoconch smoothish, but with uneven, oblique striatae. Spire slightly concave, sometimes scalariform. Body whorl keeled or rounded, often with a groove below suture. Shell umbilicate; umbilicus narrow to moderately narrow. Aperture oblique, rounded, with 0-5 apertural teeth; peristome thin, expanded.

Remarks.

Páll-Gergely et al. (2019) suggested that Thai and Philippine Aulacospira may not be closely related due to their unusual distribution pattern and suggested that the similar shell shape of these snails may be due to convergence but more data are needed to support this hypothesis. However, we continue to use Aulacospira for Thai species following the description of this genus by Pilsbry (1916-1918).