Pteropurpura debruini: Poropteron debruini: Shell up to 25 mm in length at maturity, spinose. Spire high with 1,75 protoconch whorls and up to 6 lightly convex teleoconch whorls. Protoconch whorls rounded, smooth. No apparent terminal varix. Suture lightly impressed. Third or fourth to last teleoconch whorls with 3 varices (early teleoconch whorls damaged in all examined specimens).
No other axial sculpture except fine growth striae and one, relatively weak intervaricial node. Varices of last whorl with 3 short spines. Shoulder spine longest, weakly bent adapically. Spines joined by a webbed varicial expansion with lamellate adapertural surface. Spiral sculpture consisting of numerous, shallow striae and 3 very low cords that connect the varicial spines. Aperture roundly-ovate. Columellar lip smooth, weakly erect abapically, adherent at adapical extremity. Anal notch obsolete. Outer lip smooth with 3 or 4 denticles within. Siphonal canal medium-sized, straight, sealed, with 2 short, sealed or narrowly open, acute spines. Colour whitish to brown.

Pteropurpura debruini: Poropteron debruini: Related to P. uncinarius and originally separated from that species (and from the other South African species of Pteropurpura) by its shorter and less curved shoulder spine, the less deep suture, the lesser number of varicial spines, the lack of intervaricial node, and by the presence of denticles within the aperture. The species is obviously different from P. graagae, but study of many specimens of P. uncinaria allowed me to verify that most of these proposed differences are not constant. However, the distinct apertural denticles of P. debruini not yet observed in P. uncinaria, and the fact that P. debruini apparently shows little intraspecific variation are the ac¬tual reasons for retaining it at the specific rank.

Pteropurpura debruini: Poropteron debruini: From Hout Bay, west coast of Cape Peninsula, South Africa, to Swakopmund, Namibia