Redescription of the freshwater calanoid copepod <i>Neutrodiaptomus formosus</i> with key to females of diaptomid species in Japan

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  • Ueda Hiroshi
    Usa Marine Biological Institute, Science Research Center, Kochi University
  • Tomikawa Ko
    Graduate School of Humanities and Social Sciences, Hiroshima University
  • Ohtsuka Susumu
    Takehara Station, Setouchi Field Science Center, Graduate School of Integrated Sciences of Life, Hiroshima University

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  • Redescription of the freshwater calanoid copepod Neutrodiaptomus formosus with key to females of diaptomid species in Japan

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Abstract

<p>Neutrodiaptomus formosus (Kikuchi, 1928) is a calanoid copepod found in freshwater ponds in Japan. In the original description of this species, the illustration of the female habitus and the diagnostic description of the genital double somite were based on the copepodid V stage. Since there have been no studies describing the adult female of N. formosus, we redescribed fully both sexes of adults. The female genital double somite has a prominent projection at the right posterior corner, which is unique in this genus. Some differences between N. formosus and a previous description of the congener N. tumidus were found in the segmentation and setation of the cephalothoracic appendages. A key to females of 11 diaptomid species occurring in Japanese freshwaters is provided, because the previous keys so far were based mainly on male characters.</p>

Journal

  • Plankton and Benthos Research

    Plankton and Benthos Research 15 (2), 178-184, 2020-05-27

    The Plankton Society of Japan, The Japanese Association of Benthology

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