Records of the bird capillariid nematode Ornithocapillaria appendiculata (Freitas, 1933) n. comb. from freshwater fishes in Mexico, with remarks on Capillaria patzcuarensis Osorio-Sarabia et al., 1986

Re-examination of capillariid specimens collected from the freshwater fish Chirostoma estor Jordan from Lake Patzcuaro in 1985-1986 and deposited as p aratypes of Capillaria patzcuarensis Osorio-Sarabia, Perez-Ponce de Leon & Salgado-Maldonado, 1986 showed that their morphology was in contradiction w ith the description of this species and, in fact, they could be identified as the species originally described as C. appendiculata Freitas, 1933 from cormorants Phalacrocorax brasilianus (Gm.) in Brazil; conspecific capillari id specimens were later recorded from Chirostoma estor and Cyprinus carpio L. from the same locality. This species and two others are transferred to O rnithocapillaria Barus & Sergeeva, 1990 as O. appendiculata (Freitas, 1933) n. comb., O. carbonis (Dubinin & Dubinina, 1940) n. comb., and O. phalacro coraxi (Borgarenko, 1975) n. comb. This is the first record of O. appendicu lata in Mexico. Its occurrence in fishes suggests that these nematodes may be acquired by their fish hosts accidentally while feeding on cormorant exc rement containing mature nematodes. A female capillariid collected from one of 110 Chirostoma estor examined from this locality in April, 1998 was ide ntified as Capillaria patzcuarensis. Both capillariid species are briefly d escribed and illustrated.