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Cosmocalanus darwinii

Lubbock (1860)

Download a fact sheet for Cosmocalanus darwinii (PDF 529KB)


Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Calanidae
Genus Cosmocalanus
Species darwinii


  • Female: 1.6 - 2.58 mm
  • Male: 1.6 - 2.35 mm

Distinguishing characteristics

  • Inner margin of coxa of P5 finely serrated in both sexes
  • Form of male P5
  • Spinules on posterior margin of genital and 2nd urosome somite in female


  • P5 extremely large and very asymmetrical, left exopod highly modified, right leg not modified
  • Tooth on inner edge of external spine of left P5 is placed about 1/3 of length from the from base of the spine


  • A1 reaches almost to the end of urosome
  • 5 swimming legs, all similar in form
  • Posterior prosome corners drawn into points
  • Genital somite bulges quite strongly and comes to blunt point towards the anterior somite


  • Epipelagic
  • Pacific, Indian and Atlantic
  • Subtropical and tropical


  • Eggs released into water column
  • Fine particle feeders, probably omnivorous
  • Usually restricted to surface layers
  • Females often found with 2 or more spermatophores


  • Bradford-Grieve, J. M. (1994). The marine fauna of New Zealand: Pelagic Copepoda: Megacalanidae, Calanidae, Paracalanidae, Mecynoceridae, Eucalanidae, Spinocalanidae, Clausocalanidae. National Institute of Water and Atmospheric Research, Wellington, New Zealand.
  • Conway DVP, White, R.G., Hugues-Dit-Ciles, J., Gallienne, C.P. and Robins, D.B. (2003) Guide to the coastal and surface zooplankton of the south-western Indian Ocean, Vol Occasional Publications No. 15. Marine Biological Association of the United Kingdom.
  • Dakin, W. J. and Colefax A., (1940). "The plankton of the Australian coastal waters off New South Wales Part I." Publications of the University of Sydney: 210.
  • Boxshall, G. A. and S. H. Halsey (2004). "An introduction to copepod diversity." Ray Society Publications 166: i-xv, 1-966.
  • Chiba (1953)
  • Grice G.D., (1961) 1962. - Calanoid copepods from equatorial waters of the Pacific Ocean. Fishery Bull. Fish Wildl. Serv. U.S., 61 (186): 167-246.
  • Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2009. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at