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Functional anatomy of Fossula fossiculifera



Functional anatomy of Fossula fossiculifera



American Malacological Bulletin 10(2): 129-138



Fossula fossiculifera (D'Orbigny, 1843) is the type species of the genus Fossula, a member of the family Mycetopodidae. The genus is restricted to South America. The species is found in the Parana River and its tributaries from Argentina to the state of Sao Paulo, Brazil, and in the Paragacu River on the Atlantic ridge of the state of Bahia, Brazil. These medium-sized bivalve molluscs live buried in muddy substrata. The incurrent aperture is fringed along the inner fold while the excurrent aperture is smooth. The ctenidia are of type D (Atkins, 1937a). The stomach is a type IV structure (Purchon, 1958) with morphological differences on the right wall. The posterior gut is voluminous; the typhlosole runs throughout its length. The animals are hermaphrodites and incubate their eggs in the marsupium of the inner demibranchs.

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