Description of the mature female and epicaridium larva of Cabirops montereyensis Sassaman from southern California (Crustacea: Isopoda: Cabiropidae)

The cryptoniscoid isopod Cabirops montereyensis Sassaman, previously known only from Monterey Bay, California, has been collected at Malibu, California. Diagnostic characters of the cryptoniscus larva are illustrated with scanning electron microscopy and the mature female and epicaridium larva are described. The mature female exhibits characteristics typical of most species in the genus, especially those parasitic on pseudionine bopyrids. The epicaridium larva differs from other described Cabiropidae in details of the appendages and in the possession of a prominent anal tube.