Hadroconus sibogae is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Moreover the whole shell is covered with fine growth striae, which form a large sinus above near the suture and are protracted below near the keel, following the direction of the riblets.

Its margin is bordered by a strongly beaded rib, which can be followed still a little in its interior, which is otherwise rather smooth, though sculptured by very fine radiating and spiral striae.

Its upper margin is thin, slightly broken, but judging after the growth striae, sinuous above, protracted towards the keel, which appears to have been tooth-like.

The rhachidian tooth (R) of the radula has a subquadrate body, with rounded posterior corners, enlarged sides and a short, reflected cusp, with a few denticles.