Stomacosmethis roebeleni ( Moellendorff , 1894)
Alycaeus roebeleni Möllendorff , 1894: 154, pl. 16, figs 20, 21.
Alycaeus (Alycaeus) roebeleni - Kobelt 1902: 350; Zilch 1957: 147, pl. 6, fig. 27.
Alycaeus roebeleni - Foon and Liew 2017: 62-64, figs 26, 31W.
Type locality.
"Samui Islands, Gulf of Siam" (from the title).
Material examined.
Golf von Siam, Koh-Samui, coll. Möllendorff , SMF 109317 (lectotype, designated by Zilch 1957); Siam, Samui, coll. Möllendorff , NHMW 40508 (13 shells, probably syntypes).
Remarks.
Protoconch elevated, no spiral lines visible; R1 with rather irregular, fine ribs, and somewhat weaker, dense spiral striae; R2 short, with roughly ten thicker/darker stripes, and much narrower/lighter stripes in-between, which are elevated from the surface.