| helminth parasites in freshwater fish from the papaloapan river basin, mexico. | a checklist based on previously published records and original data is presented for the helminth parasites reported in 35 fish species from nine families from the rio papaloapan basin, east mexico. the checklist contains 85 taxa from 39 helminth families. trematodes and nematodes were the most abundant taxonomic groups. the helminth fauna in the fish of the papaloapan river basin predominantly consists of neotropical species that are largely autogenic. the introduced species centrocestus formos ... | 2005 | 15812673 |