Abstract
Otodistomum is a genus of digenetic trematodes (AZYGIIDAE) which is widely distributed in elasmobranch fishes. The genus has long been known to occur in rays of both the Atlantic and Pacific coasts of North America, but the status of the species involved has been under discussion for some time. Representative collections from Raja stabuliforis from the Isles of Shoals region off the New Hampshire coast and from Raja binoculata from Pacific Grove, California, offered opportunity to restudy the characters which have been advanced by earlier workers for recognition of species and varieties of Otodistomum in North America. Stafford proposed the generic name Otodistomum in 1904 for trematodes which he identified as Otodistomnum veliporum (Creplin) from a barn-door skate of Canadian Atlantic waters. Odhner (1911) called attention to the fact that the material which Stafford and several other workers had identified as 0. veliporum was, according to his interpretation, a distinct species which von Beneden (1871) had named Distomum cestoides.
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