Abstract
Two new species representing new genera of tantulocaridans are described from western Japan. Paradoryphallophora inusitata n.g., n.sp. is parasitic on deep-sea asellote isopods and belongs in the family Doryphallophoridae. It differs from the type genus Doryphallophora in the form of the abdomen and thoracopods of the adult male, and in the stylet and the pore pattern on the dorsal cephalic shield of the tantulus larvae. Hypertantulus siphonicola n.g., n.sp. infests shallow-water siphonostomatoid copepods and is assigned to the family Basipodellidae on the basis of the pattern of thoracic tergite separation of the male trunk sac. A developing sexual female is described, only the second known from the Tantulocarida. This is the first record of tantulocaridans on a representative of the copepod order Siphonostomatoida and the first case of presumed hyperparasitism recorded in the group.
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