Monogenetic trematodes (Monopisthocotylea: Dactylogyridae) from freshwater fishes of Colombia, South America.
Eight dactylogyrid species (3 new) are reported from the gills of freshwater fish from Colombia. Anacanthorus columbianus n.sp. from Salminus affinis and Tilapia mossambica is close to A. anacanthorus but differs in hook and copulatory complex morphology. A. cuticulovaginus n.sp. from S. affinis is close to A. brazilensis but differs primarily in having only one pair of eyes, in hook and copulatory complex morphology, and in the heavily sclerotized vagina. Urocleidoides anops n.sp. from Characidium caucanum is related to U. microstomus but lacks eyes, has a vaginal sclerite, and further differs in the morphology of the copulatory complex and haptoral armament. U. costaricensis, U. heteroancistrium and U. strombicirrus n.comb (for Cleidodiscus strombicirrus Price & Bussing, 1967) were found on Astyanax fasciatus. Cichlidogyrus sclerosus and C. tilapiae, on Tilapia mossambica, are recorded for the first time from the western hemisphere.