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Subeucalanus pileatus

Giesbrecht (1888)

Download a fact sheet for Subeucalanus pileatus (PDF 371KB)


Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Subeucalanidae
Genus Subeucalanus
Species pileatus


  • Female: 1.95 - 2.50 mm
  • Male: 1.80 - 2.25 mm

Distinguishing characteristics

  • Female prosome slender, widest at the posterior end of the cephalosome
  • Female anterior cephalosome triangular, rounded anteriorly, more pointed than S. Subcrassus, but exact shape variable
  • Male similar but smaller than S. crassus, terminal setae on left P5 is shorter than the terminal segment (longer in S. subcrassus)


  • Very similar to S. crassus but much smaller
  • Terminal seta on left P5 is shorter than the terminal segment
  • Hairy terminal segment on the 5th leg


  • Anterior head triangular overall but rounded anteriorly
  • There is apparently considerable variation in the shape of the head in the female
  • Genital segment with widest part in dorsal view at midlength as long as wide; in lateral view distal part of seminal receptacles bilobed
  • Caudal rami asymmetrical
  • Antenna 2 endopod segment 1 shorter than endopod segment 2 and hardly 2.5 times as long as wide
  • Basipod 2 of mandibular palp with 3 setae, endopod reaches the distal border of basipd 2
  • Endopod segment 1 with 2 setae, endopod segment 2 with 4 setae
  • Maxilla 1 inner lobe 3 with 4 setae, basipod 2 with 5 setae
  • Maxilliped endopod segment 1 and 2 with 4 setae




  • Bradford-Grieve J., (1994). The marine fauna of New Zealand: Pelagic calanoid copopoda: Megacalanidae, Calanidae, Paracalanidae, Mecynoceridae, Eucalanidae, Spinocalanidae, Clausocalanidae. New Zealand Oceanographic Memoir 102.
  • Bradford-Grieve, J. M., E. L. Markhaseva, et al. (1999). Copepoda. South Atlantic Zooplankton. D. Boltovskoy. Leiden, The Netherlands, Backhuys Publishers. 1: 869-1098.@