Duobrachium sparksae (incertae sedis Ctenophora Tentaculata Cydippida) : A new genus and species of benthopelagic ctenophore seen at 3,910 m depth off the coast of Puerto Rico

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  • Ford Michael
    National Oceanic and Atmospheric Administration/National Marine Fisheries Service/Office of Science & Technology/Marine Ecosystems Division
  • Bezio Nicholas
    California State University Monterey Bay National Oceanic and Atmospheric Administration/National Marine Fisheries Service/National Systematics Laboratory/National Museum of Natural History
  • Collins Allen
    National Oceanic and Atmospheric Administration/National Marine Fisheries Service/National Systematics Laboratory/National Museum of Natural History

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  • <i>Duobrachium sparksae (incertae sedis</i> Ctenophora Tentaculata Cydippida)<i>:</i> A new genus and species of benthopelagic ctenophore seen at 3,910 m depth off the coast of Puerto Rico

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<p>On April 10, 2015, three individuals of an undescribed species of ctenophore were observed moving just above the seafloor in the Arecibo Amphitheater inside the Guajataca Canyon, north-northwest of Puerto Rico at a depth of approximately 3,900 m. The ctenophore is distinctive; having two prominent tentacle arms, a body that is rectangular when observed laterally along the tentacular plane, and rounded when observed laterally along the stomodeal plane. The tentacle arms each give rise to an extensible tentacle bearing short tentilla of uniform length and distribution. One ctenophore appeared to be anchored to the seafloor by its two long flexible tentacles, as well as by two filaments exiting its oral end. The overall form of the ctenophore suggests classification within the problematic, non-monophyletic order Cydippida, but the robust tentacle arms are more reminiscent of benthic species of Platyctenida, particularly those of families Lyroctenidae and Ctenoplanidae. Whereas most platyctenid ctenophores do not possess ctene rows in their adult forms, features that are possessed by the new species described herein, species of Ctenoplanidae retain comb rows as adults and are capable of limited swimming. The species described herein is easily distinguishable from all other known species of Ctenophora and may trace its origin to a lineage diverging near the origin of Platyctenida.</p>

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  • Plankton and Benthos Research

    Plankton and Benthos Research 15 (4), 296-305, 2020-11-18

    日本プランクトン学会、日本ベントス学会

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