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MORPHOLOGY OF PECTENOPHILUS ORNATUS, NEW GENUS, NEW SPECIES, A COPEPOD PARASITE OF THE JAPANESE SCALLOP PATINOPECTEN YESSOENSIS

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image of Journal of Crustacean Biology

ABSTRACT Reexamination of a crustacean parasitic on the gills of the scallop Patinopecten yessoensis has revealed that it is a copepod and not, as has been claimed, a rhizocephalan. The female is without appendages and its unsegmented, 8-mm broad body presents 1 dorsal unpaired and 2 pairs of lateral peripheral bulges. A small posterodorsal birth pore leads into a capacious brood pouch which is divided into 5 compartments by lateral septa. The mouth occurs in the middle of a circular area which is fused with a conical stalked structure made up of the host's connective tissue. The host's ctenidial epithelium lines the exterior of the stalk as well as the parasite body. The mouth opens into a blood lacuna in the middle of the stalk, and host blood is sucked into the digestive system which, in addition to a much subdivided pharynx, comprises an esophagus and a blind midgut. The female reproductive system consists of a branched ovary, 2 short oviducts, and an unpaired seminal receptacle; cement glands are absent. The males, 1-6 per female, are enclosed within a vesicle connected with the brood pouch; they are ovoid and have minute antennules, antennae, and mandibles placed on a small cephalic prominence. Spermatophores are attached to the inside of the male vesicle from where sperm are transferred to the seminal receptacle. Eggs are incubated in the brood pouch and develop into typical copepod nauplii.

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/content/journals/10.1163/193724088x00044
1988-01-01
2016-12-07

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