Sexual dimorphism in P. canaliculata has been inferred on size differences
where females are larger than males (Estebenet and Cazzaniga, 1998). In addition to
size dimorphism, qualitative analysis revealed that there appears to be variation in the
shape of the aperture and operculum where females have broader mouth and a
concave operculum and the males a convex operculum (Cowie, 2006). Since the