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Dirivultidae (Copepoda: Siphonostomatoida) from hydrothermal vent fields in the Okinawa Trough, North Pacific Ocean, with description of one new species

Published online by Cambridge University Press:  26 November 2020

Daisuke Uyeno Open the ORCID record for Daisuke Uyeno [Opens in a new window] ,
Keiichi Kakui Open the ORCID record for Keiichi Kakui [Opens in a new window] ,
Hiromi K. Watanabe Open the ORCID record for Hiromi K. Watanabe [Opens in a new window]  and
Yoshihiro Fujiwara Open the ORCID record for Yoshihiro Fujiwara [Opens in a new window]
Daisuke Uyeno*
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima890-0065, Japan
Keiichi Kakui
Affiliation:
Faculty of Science, Hokkaido University, Sapporo, Japan
Hiromi K. Watanabe
Affiliation:
X-star, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan
Yoshihiro Fujiwara
Affiliation:
RIGC, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan
*
Author for correspondence: Daisuke Uyeno, E-mail: [email protected]
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Abstract

Two species of dirivultid copepod (Siphonostomatoida), Stygiopontius senckenbergi Ivanenko & Ferrari, 2013 and Dirivultus kaiko sp. nov., were discovered from hydrothermal vent fields in the Okinawa Trough, the western North Pacific. Since S. senckenbergi was 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 lobster Shinkaia crosnieri (Decapoda: Munidopsidae). The female of S. senckenbergi is 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 kaiko sp. nov., which was found on the tentacular crown of the siboglinid tubeworm Lamellibrachia 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.

Keywords

DirivultidaeDirivultus kaiko sp. novLamellibrachia columnaROV ‘Kaiko’Shinkaia crosnieriStygiopontius senckenbergiOkinawa Trough
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 8 , December 2020 , pp. 1283 - 1298
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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