Glossobius impressus (Say, 1818) (Isopoda, Cymothoidae), a buccal-attaching fish parasite new to India

Glossobius is currently one of the most species-poor and yet most variable isopod genera parasitizing marine fishes. Recently, a cymothoid isopod identifiable as Glossobius impressus (Say, 1818), was collected in Indian waters. This collection constitutes the first Indian record of G. impressus, also from a new host, the Coromandel flyingfish Hirundichthys coromandelensis, which is the third species of this isopod genus known from the country. Here, the specimen is briefly described, and the known hosts and geographical records of the species are reviewed. A key to the three species of Glossobius from India is also given.