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Onychodiaptomus birgei
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae
Distinguishing Characteristics
  • Each caudal ramus with five setae
  • Inner process on second exopod of male left 5th leg distinctly curved
  • Large lateral spine ≥ length of second exopod on male right 5th leg
  • Third segment from the end of the right first antenna has a blunt point at the distal end
  • First segment of the right exopod with a quadrangular appendage
Additional Notes

  • Other sources:
    • Walton, W.E. 1985. The factors regulating the reproductive phenology of Onychodiaptomus birgei (Copepoda:Calanoida). Limnol. Oceanogr. 30: 167-179
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