Two New Species of the Genus Diploproctodaeum (Trematoda: Lepocreadiidae: Diploproctodaeinae), with Some Comments on Species in the Subfamily Diploproctodaeinae, from Japanese Marine Fishes : Systematics and Taxonomy

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Two new species of the trematode genus, Diploproctodaeum La Rue, 1926 (Lepocreadiidae: Diploproctodaeinae) , are described and illustrated from Japanese marine fishes. Diploproctodaeum hakofugu sp. n. from the intestine of Ostracion immaculatus (Teleostei: Ostraciidae) differs from all the previously known species of the genus and Diploproctodaeoides soleaticus Reimer, 1981, chiefly in a much more lobed ovary. Diploproctodaeum oviforme sp. n. from the intestine of Lactoria diaphanus (Ostraciidae) is separated from the most closely allied species, D, hakofugu, chiefly by the ventral sucker being much smaller than the oral sucker and pharynx. Some morphological and systematic comments are given on Japanese species in the subfamily Diploproctodaeinae Park, 1939. Diploporus Ozaki, 1928, is reduced to a synonym partly of Diploproctodaeum and partly of Bianium Stunkard, 1930. B. holocentri Yamaguti, 1942, is considered synonymous with B. hemistoma (Ozaki, 1928) Yamaguti, 1934.
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