Cryptic diversity of the tube-dwelling polychaete <i>Phyllochaetopterus</i> in the Shinkai Seep Field, Mariana Trench

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  • Kayama Watanabe Hiromi
    X-STAR, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Chen Chong
    X-STAR, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Nishi Eijiroh
    Yokohama National University
  • Ohara Yasuhiko
    Hydrographic and Oceanographic Department of Japan Research Institute for Marine Geodynamics (IMG), Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Nagoya University

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  • Cryptic diversity of the tube-dwelling polychaete Phyllochaetopterus in the Shinkai Seep Field, Mariana Trench

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Abstract

<p>Phyllochaetopterus (Annelida: Chaetopteridae) is a diverse genus of tube-dwelling polychaetes found in a wide range of marine environments from subtidal to abyssal depths, including chemosynthesis-based ecosystems. The Shinkai Seep Field (SSF) is a serpentinite-hosted system in the Mariana Trench, where the deepest-known Phyllochaetopterus polychaetes inhabit the surfaces of brucite/carbonate chimneys. Despite all specimens collected from SSF being morphologically consistent with P. polus originally described from a deep-sea hot vent on the Mid-Atlantic Ridge, molecular barcoding using the mitochondrial cytochrome c oxidase subunit I (COI) gene revealed at least three cryptic lineages, none of which corresponded to P. polus. Phylogenetic reconstruction recovered P. polus embedded among the three SSF lineages, confirming their close relationship. These results warrant careful examination of Phyllochaetopterus from other regions using integrative taxonomy in order to understand its true diversity and pinpoint further taxonomically informative morphological characters.</p>

Journal

  • Plankton and Benthos Research

    Plankton and Benthos Research 16 (1), 73-77, 2021-02-19

    The Plankton Society of Japan, The Japanese Association of Benthology

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