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Mesocalanus tenuicornis

Dana (1849)

Download a fact sheet for Mesocalanus tenuicornis (PDF 515KB)


Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Calanidae
Genus Mesocalanus
Species tenuicornis


  • Female: 1.80 - 2.40 mm
  • Male: 1.70 - 2.20 mm

Distinguishing characteristics

  • P1-P4 without modification or ornamentation
  • Smooth inner margin of P5 coxa in both sexes
  • Form of P5


  • A1 around twice as long as prosome
  • P5 only slightly asymmetric
  • Left P5 terminal spine of exopod segment 3 almost as long as itfs segment when measured along the outer border


  • A1 around twice length of prosome
  • Width to length ration of pedigerous somites is equal to or greater than 0.3
  • Posterior margin of cephalosome not elevated in lateral view
  • 5 swimming legs, all similar
  • Urosome somite 2 about 1.25 times longer than somite 3


  • Epi-, meso- and bathypelagic
  • Cosmopolitan
  • Pacific , Indian and Atlantic
  • Tropical, subtropical and temperate; possibly into subantarctic


  • Fine particle feeders, probably omnivorous
  • Eggs released into water column
  • Up to 3 generations per year
  • Has been observed in Alaskan waters, so broad temperature (and possibly salinity) tolerance


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