Paralepidapedon g. n. (Trematoda : Lepocreadiidae), with Descriptions of Metacercariae of Paralepidapedon hoplognathi (Yamaguti, 1938) comb. n. and of Two Other Species from Sea Urchins(Taxonomy)

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Paralepidapedon g. n. (Trematoda : Lepocreadiidae) is erected to receive P. hoplognathi (Yamaguti, 1938) comb. n. (type species), P. antarcticum (Prudhoe et Bray, 1973) comb, n., P. dubium (Prudhoe et Bray, 1973) comb. n. and P. sebastisci (Yamaguti, 1938) comb. n. This genus is most closely related to Neolepidapedon Manter, 1954, but different from it in having the uroproct. Metacercariae of P. hoplognathi were found encysted in the sea urchins, Anthocidaris crassispina, Hemicentrotus pulcherrimus and Pseudocentrotus depressus, at Misaki, Kanagawa Prefecture, and developed to sexual maturity in the fish, Oplegnathus fasciatus, in feeding experiments. The metacercarial and adult worms are described. The development, structure and phylogenetic importance of the cirrus pouch in the genus are discussed. In addition, simultaneously obtained metacercariae of Proctoeces maculatus (Looss, 1901) Odhner, 191 1 (Fellodistomidae), from A. crassispina, Diadema setosum and H. pulcherrimus, and of an unidentified trematode from A. crassispina are briefly described.
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