Abstract
The cercaria of N. kentuckiensis was found in Anaplocamus dilatatus (Nitrocris d.) and Mudalia carinata. The metacercaria was found in all fishes examined from Opequon River, West Virginia, except Cottus bairdi which was also refractory to experimental infection. Two species of Centrarchidae, four of Cyprinidae, three of Salmonidae, Etheostoma flabellare, Platypoecilus maculatus, and Trichogaster trichopterus were experimentally infected. The development of the metacercaria and cyst and effect on the fish are described. The histopathology initially consists of hemorrhage and muscle necrosis about the metacercaria, followed by reorganization and formation of a loose connective tissue cyst. The controversial adult names are discussed and an emendation of the genus Neogogatea is presented. A survey of fishes from the Opequon River near Leetown, West Virginia, revealed a high population of the prohemistomulum metacercaria of Neogogatea kentuckiensis n. comb. (Mesostephanus k.). Likewise the snail host was found to be heavily parasitized. The longifurcate cercaria of this trematode was described as Cercaria kentuckiensis by Cable (1935) from Goniobasis semicarinata in Kentucky. Anderson (1944) reported it from Goniobasis depygis in Indiana. Chandler and Rausch (1948) described the adult Neogogatea pandionis, a closely related worm, from the osprey, Pandion haliaetus carolinensis. Vemberg (1952) reported the cercaria from Goniobasis livescens in Indiana. Myer (1960) stated that the cercaria of Prohemistomum chandleri, also reported by Vemberg (1952), is probably Cercaria kentuckiensis. Hoffman (1959) reported the metacercaria from fish and an experimental adult from baby chicks as Neogogatea pandionis Chandler and Rausch. Myer (1960) redescribed the cercaria, infected fish with the cercaria, and reared the metacercaria to adult in baby chicks; he named the adult Mesostephanus kentuckiensis n. comb. Our adult form, reared in baby chicks, which is identical with Myer's, is very similar to the adult described from the osprey by Chandler Received for publication 11 December 1962. and Rausch (1948). Apparently the latter is either a closely related species of the same genus or the slight differences might be due to fixation artefacts. Our metacercaria has been deposited in the USNM Helminthological Collection as no. 56005, the adult as no. 38887.
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