Prosimnia semperi (Weinkauff, 1881)
12mm

It is difficult to distinguish between this and the species we are calling Prosimnia draconis. According to Lorenz & Fehse (2009) the primary differentiating character in shell sculpture is one that we cannot reliably see in our photos of the living animals. We have divided them based on the presence of a more prominent transverse ridge of nodules near the anterior end of the shell in P. draconis. That feature, however, seems to vary, and there may not be a sharp dividing line between the more and less nodulolse forms. We saw these two species at a number of sites around Bali, including the Tulamben area and Gilimanuk near the western end of the island.

Created 30 December 2018

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