NEW HOST RECORD FOR THE WHALE LOUSE ISOCYAMUS DELPHINII (AMPHIPODA, CYAMIDAE)

Abstract

Isocyamus delphinii (Gu?rin-M?neville, 1836) was described from the com mon dolphin, Delphinus delphis L., 1758. It has subsequently been recorded from Risso's dolphin, Grampus griseus (G. Cuvier, 1812), the long-finned pilot whale, Globicephala melas (Traill, 1809), the short-finned pilot whale, Globi cephala macrorhynchus Gray, 1846, the white-beaked dolphin, Lagenorhynchus albirostris (Gray, 1846), the false killer whale, Pseudorca crassidens (Owen, 1846), the rough-toothed dolphin, Steno bredanensis (Lesson, 1828), the harbor porpoise, Phocoena phocoena (L., 1758), the bottlenose dolphin, Tursiops trunca tus (Montagu, 1821), and the Antillian beaked whale, Mesoplodon europaeus Ger vais, 1855. For documentation of the above host records, the reader is referred to Martin & Heyning, 1999 (their table 1 and Literature Cited section) and to Haney (unpubl.). The killer whale, Orcinus orea (L., 1758), is also listed as a host for /. delphinii in Sedlak-Weinstein (1992), who cites Best (1969) for the host record. One of the present authors (Haney), however, found no such reference in Best's report, so the record of this cyamid species from the killer whale is considered doubtful. Although Isocyamus delphinii has been reported on the aforementioned ceta cean hosts from various localities in the North Atlantic and Pacific oceans, it has only once been previously recorded from a cetacean in the Gulf of Mexico (Bowman, 1955).