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UTAS Home > IMAS Home > Image Key > Copepoda > Calanoida > Mecynoceridae >  Mecynocera clausi

Mecynocera clausi

I.C. Thomson (1888)

Download a fact sheet for Mecynocera clausi (PDF 316KB)


Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Mecynoceridae
Genus Mecynocera
Species clausi


  • Female: 0.92 – 1.21 mm
  • Male: 0.94 – 1.12 mm

Distinguishing characteristics

  • Spermathecae obvious and nearly spherical
  • A1 extends well beyond caudal rami in females


  • A1 extends beyond caudal rami by 1-2 segments and is not geniculate
  • Dorsal cephalic hump present
  • P1 Enp 1 segmented
  • P1-P4 segmentation as for female
  • P5 uniramous, 5 segmented, asymmetrical, right leg is longer
  • Right P5 inner border hairy, terminal segments on both sides with a stout terminal spine and short disto lateral spinule
  • Genital pore on right side


  • A1 twice as long as body with elongate setae on many of the segments
  • P1 has a 3 segmented exopod and 1 segmented endopod
  • P2-4 almost identical, exopods and endopods 3 segmented
  • P5 uniramous, symetrical, 5 segmented
  • Spermathecae obvious and nearly spherical


  • Epipelagic
  • Predominantly oceanic, can occur in estuarine and coastal areas
  • Australian distribution includes Western Australia, Great Barrier Reef, North West Cape and Tasmania
  • World distribution: widespread in tropical, subtropical and temperate waters of all oceans
  • Also found in sub-Antarctic waters


  • More abundant on Great Barrier Reef during winter (August) than summer (January – March)
  • Found in Tasmania throughout the year
  • Herbivorous


  • Boxshall, G. A. and S. H. Halsey (2004). "An introduction to copepod diversity." Ray Society Publications 166: i-xv, 1-966.
  • 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.
  • Bradford-Grieve, J. M., E. L. Markhaseva, et al. (1999). Copepoda. South Atlantic Zooplankton. D. Boltovskoy. Leiden, The Netherlands, Backhuys Publishers. 1: 869-1098.
  • Mckinnon, A. D., S. Duggan, et al. (2005). "Mesozooplankton dynamics in nearshore waters of the Great Barrier Reef." Estuarine, Coastal and Shelf Science 63(4): 497-511.
  • Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2009. Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at
  • Taw & Ritz (1978)