Capillariids (Nematoda, Capillariidae) from Agonostomus monticola and Gobiomorus spp. (Pisces, Mugilidae and Eleotridae) from fresh waters in Mexico

A new nematode, Paracapillaroides agonostomi gen. et sp. n., is described f rom the stomach and the intestine of the mugilid Agonostomus monticola (Ban croft) from the Cuitzmala River (the Pacific Ocean basin), State of Jalisco ; Mexico. This capillariid species represents a new genus similar to Paraca pillaria Mendonca, 1963, differing from it substantially in the structure o f the spicular sheath that is formed by two distinct parts, a broader and m uch shorter spinose proximal part and a narrower, very long aspinose distal part. Another capillariid, Paracapillaria teixeirafreitasi pacifica subsp. n. is described from the intestine of eleotrids Gobiomorus polylepis Ginsb urg (type host) and G. maculatus (Gunther) from the same locality (Cuitzmal a River, Jalisco). This subspecies is differentiated from P. teixeirafreita si teixeirafreitasi (G. Caballero, 1971) by the absence of a pair of minute preanal papillae, by a considerably longer spicule (0.261-0.501 mm),a dist inctly thicker egg wall, and by the geographical distribution (Pacific Ocea n basin). P. teixeirafreitasi teixeirafreitasi is briefly described from sp ecimens collected from Gobiomorus dormitor Lacepede from the Tecolutla Rive r, Veracruz, Mexico.