A survey of the cestode parasites collectd from 332 specimens of freshwater fishes of Lake Nasser at Asswan, revealed the presence
of 4 species, one of which is new (Marsypocephalus aegyptiacus n. sp. from Clarias lazera; Proteocephalus sulcatus from Clarias lazera & C. anguillaris; Caryophyllaeus laticeps from Barbus bynni and Bothriocephalus barbus from Barbus bynni).
In addition to the new species and revised data on the morphology and variability of the individual parasite species, taxonomic problems, the range of hosts and geographical distribution are also discussed.