Dioryx distortus (Haines, 1855)

Cyclostoma distortum Haines, 1855: 158, pl. 5, figs 5-8.

Alycaeus distortus - Reeve 1878: pl. 3, species 24.

Dioryx distortus - Kobelt and Möllendorff 1897: 146; Kobelt 1902: 337.

Type locality.

“Siam” .

Material examined.

Siam: coll. Haines, AMNH 62467 (1 syntype).

Remarks.

Protoconch matte, without spiral striation; the overall sculpture very weak; first whorl of R1 with spiral striation and widely spaced, irregular radial lines; later spiral lines disappear and radial lines become regular and dense; R2 very long, reaches ca. 150°, it is entirely smooth, only slimmer light and thicker darker stripes alternate.