Known definitive hosts: sharks, skates, and rays; this specimen is from the round stingray, Urolophus halleri
Site of infection: spiral valve
Typical size: variable; often fairly small
Distribution: trypanorhynchs are worldwide in marine waters and go wherever their hosts go; this specimen was taken from a stingray in the Gulf of California.
First intermediate host: the few life-cycles that have been described have demonstrated procercoids in copepods
Second intermediate host: the few life-cycles that have been described have shown teleost fish to harbor the pleurocercoids