New records of crustacean (Isopoda: Bopyridae and Cirripedia: Rhizocephala) and molluscan (Bivalvia: Galeommatoidea) symbionts from gebiid mud shrimps (Crustacea: Decapoda: Gebiidea) with description of a new species of Gyge Cornalia & Panceli, 1861 from Iran

Gebiid mud shrimps host numerous symbionts including nearly 40 described species of parasitic epicaridean isopods as well as rhizocephalan barnacles and bivalve molluscs. Collections of gebiids from the Senckenberg Forschungsinstitut were examined to locate new and previously cited specimens bearing bopyrid, rhizocephalan and mollusc symbionts. We report on material from Japan consisting of four species of bopyrid isopods from three genera (Gyge, Phyllodurus, and Procepon), one rhizocephalan barnacle (Parasacculina shiinoi), and one symbiotic bivalve (Peregrinamor ohshimai).

The record of the abdominal bopyrid Phyllodurus sp. is based on a single male specimen but likely represents a new species although more material is needed to make that determination. We also report on an additional two species of Gyge: one from European waters (G. branchialis) and one new species from the Persian Gulf. The new species can be distinguished from its closest congener based on the female uropods being visible in dorsal view and having a straight posterior lobe of the first oostegite plus the male having large midventral tubercles on the posterior five pereomeres and all pleomeres.

A key to females of all species of Gyge is provided.