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Farranula gracilis

Dana (1849)

Download a fact sheet for Farranula gracilis (PDF 460KB)


Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Cyclopoida
Family Corycaeidae
Genus Farranula
Species gracilis


  • Female: 0.79 – 1.10 mm
  • Male: 0.66 – 0.96 mm

Distinguishing characteristics

  • Cuticular lenses
  • Urosome form


  • Very difficult to identify
  • Urosome <3 times longer than caudal rami
  • Posterior margin of the genital enlargements 2/3 of the way down urosome
  • Caudal rami >2 times as long as wide


  • 2 plumose or spiny setae at base of A2
  • Prosome 2 segmented
  • Beak like keel on ventral surface
  • No mid dorsal hump on second prosome segment
  • P4 with no trace of endopod, 1 naked seta at the base
  • Urosome 1 segmented
  • Urosome 2 times as long as caudal rami
  • In lateral view, anterior section of dorsal margin of genital somite is almost parallel to ventral margin




  • 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.
  • Farran, G. P. (1911). "Plankton from Christmas Island, Indian Ocean. I. On Copepoda of the Family Corycaeidae." London Proc. Zool. Soc. 1911: (282-296).
  • Tanaka, O. (1957). "On copepoda of the family Corycaeidae in Japanese waters." Journal of the Faculty of Agriculture, Kyushu University 11(1): 77-97.