Chamalycaeus excisus ( Moellendorff , 1887)
Alycaeus excisus Möllendorff , 1887b: 287.
Alycaeus (Chamalycaeus) excisus - Kobelt 1902: 355.
Chamalycaeus (Chamalycaeus) excisus - Zilch 1957: 142, pl. 6, fig. 20.
Chamalycaeus excisus excisus - Páll-Gergely and Auffenberg 2019: 378, figs 2B, 3, 4C, D.
Type locality.
"Insel Bongao zwischen Sulu und Borneo" (from the title).
Material examined.
Sulu-Inseln, Insel Bongao (Tawi-Tawi-Gr.), leg. Möllendorff 1890, coll. O. Boettger, SMF 109479 (holotype [single adult specimen mentioned in the original description]); Same data, SMF 109480 (4 paratypes).
Remarks.
Protoconch elevated without spiral lines; R1 with weak, widely spaced, irregular ribs and somewhat stronger spiral striation; R2 relatively short, with widely spaced, elevated, sharp ribs.