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SEM OBSERVATION OF THE NAUPLIUS OF MONSTRILLA HAMATAPEX, NEW SPECIES, FROM JAPAN AND AN EXAMPLE OF UPGRADED DESCRIPTIVE STANDARDS FOR MONSTRILLOID COPEPODS

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ABSTRACT The first description since 1901 of the free nauplius of a monstrilloid copepod is presented, based on scanning electron microscopy. First-instar larvae were hatched from eggs borne by a female Monstrilla hamatapex, new species, from inshore plankton in Tanabe Bay, Honshu, Japan. The naupliar appendages are less oligomerous and bear more setae than previously reported. Their apomorphies relative to a copepod naupliar "Bauplan" are identified by comparison to first instar nauplii of other copepod orders. The new species, based on the egg-bearing female and another female from Ago Bay, Honshu, is distinguished from M. helgolandica Claus, 1863, and some literature records of the latter, a supposedly widespread species, are brought into question. A nomenclature is devised for female monstrilloid antennular setae, and a list is provided of potentially diagnostic features that never or rarely have been used until now in adult monstrilloid taxonomy.

10.1163/193724095X00118
/content/journals/10.1163/193724095x00118
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/content/journals/10.1163/193724095x00118
2017-11-22

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