Three new meiobenthic species from a submarine cave in Japan: Echinoderes gama, E. kajiharai, and E. uozumii (Kinorhyncha: Cyclorhagida)

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  • Yamasaki, Hiroshi
    Faculty of Arts and Science, Kyushu University Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity
  • Fujimoto, Shinta
    Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University
  • Tanaka, Hayato
    Tokyo Sea Life Park

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Abstract

Three new species of echinoderid kinorhynchs are described from Daidokutsu, a submarine cave in Ryukyu Islands, Japan. Echinoderes gama sp. nov. is characterized by the presence of middorsal acicular spines on segments 4–8; lateroventral acicular spines on segments 7–9; lateroventral tubes on segment 5; sublateral tubes on segment 8; laterodorsal tubes on segment 10; and type-2 gland cell outlets in subdorsal and lateroventral position on segment 2. Echinoderes kajiharai sp. nov. is defined by the presence of middorsal acicular spines on segments 4, 6, 8; lateral accessory acicular spines on segment 9; lateroventral acicular spines on segments 6–8; lateroventral tubes on segments 2 and 5; midlateral tubes on segment 10; and type-2 gland cell outlets in laterodorsal position on segments 2 and 5, and subdorsal position on segments 8 and 9. Echinoderes uozumii sp. nov. is characterized by the presence of middorsal acicular spines on segments 4 and 6; lateroventral acicular spines on segments 6–9; lateroventral tubes on segments 2 and 5; sublateral tubes on segment 8; laterodorsal tubes on segment 10; type-2 gland cell outlets in subdorsal and lateral accessory position on segment 2; and blunt, short pectinate fringe teeth of primary pectinate fringe on segment 1. In addition, the Echinoderes multiporus species group including E. kajiharai sp. nov., and the Echinoderes bispinosus species group including E. uozumii sp. nov. are established. Furthermore, the distribution of the two species groups and the origin of Echinoderes species in Daidokutsu are discussed.

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Details 詳細情報について

  • CRID
    1050580007680245248
  • NII Book ID
    AA00701587
  • ISSN
    14697769
    00253154
  • HANDLE
    2324/4774181
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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