Ptychobranchus occidentalis

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Ptychobranchus occidentalis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Unionoida
Family: Unionidae
Genus: Ptychobranchus
Species: P. occidentalis
Binomial name
Ptychobranchus occidentalis
Conrad, 1836

Ptychobranchus occidentalis is a species of freshwater mussel in the family Unionidae, the river mussels. It is endemic to the United States,[1] where it is known from Arkansas, Kansas, Louisiana, Missouri, and Oklahoma. Its common name is Ouachita kidneyshell.[2]

This mussel packages its larvae, or glochidia, in a membranous conglutinate which resembles a small prey item. When a fish comes to investigate this lure, the glochidia attach to its gills and use it as a host during their development.[3]


  1. ^ a b Bogan, A. E. 1996. Ptychobranchus occidentalis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. Downloaded on 05 August 2013.
  2. ^ Ptychobranchus occidentalis. NatureServe. 2012.
  3. ^ Orangethroat darter (Etheostoma spectabile) with the conglutinates of Ouachita kidneyshell, (Ptychobranchus occidentalis). Freshwater Mollusk Conservation Society.