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Subeucalanus subcrassus

Giesbrecht (1888)

Download a fact sheet for Subeucalanus subcrassus (PDF 418KB)


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


  • Female: 2.35 - 2.68 mm
  • Male: 2.40 mm

Distinguishing characteristics

  • Female similar to S. crassus but slimmer, genital somite is also narrower
  • Female anterior cephalosome rounded anteriorly, more pointed and extends further forward in lateral view than S. crassus
  • Male similar but smaller than S. crassus, terminal setae on left P5 is longer than the terminal segment (shorter in S. plieatus)


  • Terminal seta on left leg 5 longer than the terminal segment


  • Anterior of head rounded anteriorly
  • Genital segment broader than long with widest part in dorsal view on the posterior half of the segment
  • Caudal rami assymetrical
  • Antenna 2 endopod segment 1 shorter than endopod segment 2 and less than 3 times as long as wide
  • Basipod 2 of mandibular palp with 3 setae, endopod reaches the distal boarder of basipod 2, endopod segment 1 with 2 detse, endopod segment 2 with 4 setae
  • Maxilla 1 inner lobe 3 with 4 setae, basipod 2 with 5 setae
  • Maxilliped endopod segments 1 and 2 with 4 setae each
  • This species has often been confused with S. pilateus and S. monachus


  • Epiplanktonic
  • Broadly neritic
  • Tropical Indo-West Pacific



  • 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.