[New species of thorny-headed worms of the genus Echinorhynchus (Echinorhynchidae) from fish of the southwestern Atlantic].

Two new species of Acanthocephala of the genus Echinorhynchus were found and described from fishes of Falkland-Patagonia and South Georgia Island area. E. longiproboscis sp. n. from Dissostichus eleginoides and Macrourus holotrachys intestines differs from its close relative E. gadi (Zoega in Müller, 1776) in proboscis armature and the proboscis to the body length ratio. E. georgianus sp. n. from D. eleginoides intestines differs from E. gadi in proboscis armature and length and shape of the basal hooks.