Diagnosis, Systematics, and Notes on Grandidierella japonica (Amphipoda: Gammaridea) and Its Introduction to the Pacific Coast of the United States

Abstract

The introduction of Grandidierella japonica Stephensen, 1938 (Corophiidae) from Japan to Tomales Bay, Bolinas Lagoon and San Francisco Bay, California, is recorded for the first time. A diagnosis and a list of associate species are given. The possible synonymy of the genera Grandidierella and Neomicrodeutopus is indicated. This species probably arrived with oyster spat transplants from Japan.