Two microsporidian parasites found in marine fishes in the Atlantic Ocean.

Two new species of microsporidia are reported from the Atlantic marine fishes: Pleistophora duodecimae sp. n. from skeletal musculature of the rat-tail, Coryphaenoides nasutus Günther and Glugea capverdensis sp. n. from the intestine, mesentery and ovary of the lantern fish, Myctophum punctatum Rafinesque. Formation of secondary xenomas was observed in the latter species. Both species may inflict serious damage upon their hosts.