The genus Metamysidopsis W. M. Tattersall is currently represented by two species in the eastern Pacific: M. elongata (Holmes, 1910) in California, U.S.A., and M. pacifica (Zimmer, 1918) in Peru… Click to show full abstract
The genus Metamysidopsis W. M. Tattersall is currently represented by two species in the eastern Pacific: M. elongata (Holmes, 1910) in California, U.S.A., and M. pacifica (Zimmer, 1918) in Peru and Panama. The distribution and some morphological details of both species are presented and discussed and a new species is described from the southern Gulf of California, western Mexico. Commonly used diagnostic characters for the species of Metamysidopsis are analysed based on data available in the literature. A diagnosis is provided for the three species occurring in the eastern Pacific and a key to the 10 currently known species of the genus is provided.
               
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