New records of trypanorhynch cestodes from the Gulf of Mexico, including Kotorella pronosoma (Stossich, 1901) and Heteronybelinia palliata (Linton, 1924) comb. n.

Four trypanorhynchs, Kororella pronosoma (Stossich, 1901), Nybelinia cf. bi sulcata (Linton, 1889), Nybelinia scoliodoni (Vijayalakshmi, Vijayalakshmi et Gangadharam, 1996), and Dasyrhynchus pacificus Robinson, 1965 are report ed for the first time from the Gulf, which is now known to harbour at least 34 different species. In addition to the range extension for the trypanorh ynchs listed above, 21 new host records are reported involving 13 cestode s pecies. Characters of the genus Kotorella Euzet et Radujkovic, 1989 are eme nded, Nybelinia narinari MacCallum, 1917 is considered a junior synonym of Kotorella pronosoma (Stossich, 1901), and Heteronybelinia palliata (Linton, 1924) comb. n. is redescribed. The usefulness of the bulb ratio as a means to distinguish different tentaculariid species is discussed, and the impor tance of shallow water localities for the life cycle of trypanorhynch cesto des is emphasised.