A CRITICAL STUDY OF STAFFORD'S REPORT ON "TREMATODES OF CANADIAN FISHES" BASED ON HIS TREMATODE COLLECTION

Abstract

The internal trematodes from fish in the late Dr. Stafford's slide collection have been restudied and described. Gasterostomum armatum of Stafford is identified with Prosorhynchus squamatus Ohdner, 1905, and Crepidostomum laureatum with C. cooperi Hopkins, 1932. Homalometron pallidum Stafford, 1904, is redescribed and it is suggested that the genus Homalometron Stafford, 1904, is synonymous with Lepocreadium Stossich, 1904. Neophasis pusilla Stafford, 1904, and Stenakron vetustum Stafford, 1904, are redescribed and assigned to the family Allocreadiidae. Hemiurus appendiculatus of Stafford, is demonstrated to represent H. levinseni Ohdner, 1905, and Brachyphallus crenatus Rudolphi, 1802, while Fellodistomum incisum of Stafford represents the species F. fellis Olsson, 1868, and F. agnotum Nicoll, 1909. Species of the genera Azygia and Otodistomum are reidentified. Protenteron diaphanum Stafford, 1904, is redescribed and the species is referred to the genus Cryptogonimus Osborn, 1903, the new combination being Cryptogonimus diaphanus.