Abstract
AbstractTwo species of dirivultid copepod (Siphonostomatoida),Stygiopontius senckenbergiIvanenko & Ferrari, 2013 andDirivultus kaikosp. nov., were discovered from hydrothermal vent fields in the Okinawa Trough, the western North Pacific. SinceS. senckenbergiwas originally described based on two adult males from the New Ireland Fore-Arc system, Papua New Guinea, the discovery here represents the second record. This species was attached on ventral setae covered with filamentous bacteria of the deep-sea squat lobsterShinkaia crosnieri(Decapoda: Munidopsidae). The female ofS. senckenbergiis described for the first time as well as the nauplius I and the copepodid IV. Sexual dimorphism is shown on several appendages (i.e. antennule, leg 2 and leg 5). The nauplius I shows typical lethithotrophic characteristics.Dirivultus kaikosp. nov., which was found on the tentacular crown of the siboglinid tubewormLamellibrachia columna, differs from its two congeners by the antennule, maxilliped and leg 5 of both sexes. These are the second and third dirivultid species to be reported from Japan.
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