Ceratothoa angulata (Richardson) was found in the mouth of
Dussumier's halfbeak, Hyporhamphus dussumieri; Cymothoa bychowskyi
Avdeev in the gill chamber of the red cornetfish, Fistularia petimba; and Elthusa
raynaudii (Milne-Edwards) in the mouth of the blueline snapper, Lutjanus kasmira,
collected in Guam. Elthusa raynaudii has only been reported in the Southern
Hemisphere, except for one other record in Japan; C. bychowskyi has previously
only been found in the Indian Ocean; and C. angulata has previously
only been found in the Philippines and Borneo. The blueline snapper is a new
host for E. raynaudii. These great range extensions suggest how poorly cymothoid
isopods are known
