CENOTES (SINKHOLES) OF THE YUCATAN PENINSULA, MEXICO, AS A HABITAT OFADULT TREMATODES OF FISH

Examination of a total of 581 fish specimens of 15 species from 39 cen otes (sinkholes) in the Yucatan Peninsula, southeastern Mexico, reveal ed the presence of 10 species of adult trematodes. These were as follo ws. Saccocoelioides sogandaresi Lumsden, 1963, Saccocoelioides sp. (fa mily Haploporidae), Cichlusotrema ujati Pineda et Andrade, 1989 (Angio dictyidae), Crassicutis cichlasomae Manter, 1936 (Homalometridae), Mag nivitellinum simplex Kloss, 1966 (Macroderoididae), Stunkardiella mini ma (Stunkard, 1938) (Acanthostomidae), Oligogonotylus manteri Watson, 1976 (Cryptogonimidae), Genarchella tropica (Manter, 1936), G. astyana ctis (Watson, 1976), and G. isabellae (Lamothe-Argumedo, 1977) (Deroge nidae). Saccocoelioides sogandaresi is reported from Mexico for the fi rst time. Poecilia velifera and P. latipunctata for S. sogundaresi, Ci chlasoma octofasciatum for C. cichlasomae, Cichlasoma Friedrichstahli and C. meeki for O. manteri, and C. meeki, C. octofasciatum and Gobiom orus dormitor for G. isabellae represent new host records. Most specie s found are described and figured and their host range and distributio n are discussed.