PHILOMETRA-MARGOLISI N-SP (NEMATODA, PHILOMETRIDAE) FROM THE GONADS OF THE RED GROUPER, EPINEPHELUS-MORIO (PISCES, SERRANIDAE), IN MEXICO

A new nematode species, Philometra margolisi n.sp., is described from the gonads of the serranid fish Epinephelus morio from Mexico (localit ies Telchac, Chuburna, Progreso, and Rio Lagartos, Yucatan). It is cha racterized mainly by long (0.432-0.468 mm) and slender spicules and a simple gubernaculum (length 0.084-0.093 mm) in the male and by body sh ape and size (length 65-85 mm), arrangement and number of small cephal ic papillae (eight papillae in an outer circle and four in an inner on e), structure and length (1.07-1.18 mm) of the esophagus, long ovaries , and the presence of a pair of small lateral papilla-like projections on the elongate caudal end in gravid females.