Mussel of the

Page last updated
10 December 2003

Mussel of the Month

The December 2003 Mussel of the Month is Prisodon obliquus. P. obliquus is a member of the freshwater mussel family Hyriidae from the Amazon region of South America.

Prisodon obliquus
Plate 27, figs. 1-2 from Spix & Wagner (1827, Testacea Fluviatilia
Quae in Itinere per Brasiliam Annis MDCCCXVII – MDCCCXX)

The figure of this month's MUSSELp Mussel of the Month is from Spix & Wagner's 19th century treatment of the freshwater Mollusca of Brazil. They actually favored two different names for the shell illustrated above: Unio caudatus and Diplodon furcatum! This potential confusion, however, is moot since the same species was described earlier by Schumacher under the name Prisodon obliquus.


Phylum Mollusca
Class Bivalvia
Subclass Palaeoheterodonta
Order Unionoida

Superfamily Etherioidea Deshayes, 1830

Family Hyriidae Swainson, 1840
Subfamily Hyriinae s.s.
Tribe Hyriini

Genus Prisodon Schumacher, 1817

Species Prisodon obliquus Schumacher, 1817
(+ Unio caudatus + Diplodon furcatum, Spix & Wager, 1827)

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