Mussel of the

Page last updated
2 October 2009

Mussel of the Month

The October 2009 Mussel of the Month is Inversidens brandtii. Inversidens is a genus of two species, found in Japan, China, and eastern Russia.

Inversidens brandtii
SMF 3646. Mikawa, Japan (type of U. parcedentata).

Inversidens is currently thought of as consisting of only two species. Formerly, however, it was regarded to have as many as six species (Haas, 1969). Improvements in data beyond just conchological similarities have inspired several revisions, resulting in the former Inversidens being split into three different genera: Inversidens, Inversiunio, and Pronodularia. Since we published our global checklist (Graf & Cummings, 2007), new species have been described in both Inversiunio and Pronodularia. Furthermore, the Russian Comparatory School of Malacology has has also weighed in and recognized numerous species that no one else sees. We don't regard their special brand of splitting to be that helpful.

Haas (1969) Current

Inversidens brandtii
Inversidens parcedentata
Inversidens brandtii
Inversidens pantoensis Inversidens pantoensis
Inversidens japanensis japanensis
Pronodularia japanensis
Pronodularia seomjinensis
Inversidens japanensis jokohamensis
Inversidens haconensis
Inversiunio jokohamensis
Inversidens reinianus Inversiunio reinianus
  Inversiunio yanagawensis
  Inversiunio verrucosus


Phylum Mollusca
Class Bivalvia
Subclass Palaeoheterodonta
Order Unionoida

Superfamily UNIONOIDEA Rafinesque, 1820

Family UNIONIDAE s.s.

Genus Inversidens Haas, 1911

Species Inversidens brandtii (Kobelt, 1879)

For more information about the taxonomy of Inversidens, check out:
  • Graf, D.L. & K.S. Cummings. 2007. Review of the systematics and global diversity of freshwater mussel species (Bivalvia: Unionoida). Journal of Molluscan Studies 73: 291-314.
  • Haas, F. 1969. Superfamilia Unionacea. Das Tierreich (Berlin) 88: 663 pp.
  • Kondo, T. 1982. Taxonomic revision of Inversidens (Bivalvia: Unionidae). Venus 41: 181-198.
  • Kondo, T. Y. Hyun, & C. Seung-Ho. 2007. Two new species of unionid mussels (Bivalvia: Unionidae) from Korea. Venus 66: 69-73.
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