Scutalus versicolor

Broderip described in 1832 Bulinus versicolor from “in montibus Peruviae (Mongon, near Casma)”. This undoubtedly refers to Cerro Mongón, near the village Casma on the coast of northern Peru.

During work in the London museum I found two lots, one of which is considered possible type material. These shows some variation, but on photographs recently taken from material collected at the type locality, it may be seen that this variation is considerable, both in shape of the shell and aperture.

The type locality is a ‘lomas’ on a hill south of Casma, and the irregular, very scarse precipitation may play an important role in the development of these snails. However, no other data are known on the biology of this species.

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