How to Distinguish from Similar Species: This is the only clam found attached by byssal threads to the abdomen of Upogebia. Pseudopythina compressa has a serrated dorsal margin of its right valve, and a thickness about 1/3 the length; plus does not have an indented ventral margin (and is not on Upogebia).
Geographical Range: Kodiak, Alaska to Punta Rompiente, Baja California.
Depth Range: Intertidal to 5m
Habitat: Symbiont on the abdomen of Upogebia pugettensis and on Aphrodita polychaetes.
Biology/Natural History: Males in this species are dwarves and can be found in the mantle cavity of the larger female.
Smith et al. (2008) found in a small sample that parasitism by this clam did not seem to cause weight loss in Upogebia pugettensis.
Kozloff 1987, 1996
Smith, Andrew E., John W. Chapman, and Brett R. Dumbauld, 2008. Population structure and energetics of the bopyrid isopod parasite Orthione griffinis in mud shrimp Upogebia pugettensis. Journal of Crustacean Biology 28(2): 228-233
General Notes and Observations: Locations, abundances, unusual behaviors:
Authors and Editors of Page:
Dave Cowles (2005): Created original page