Scottocalanus investigatoris   Sewell,  1929 (Copepod)
Organism information awaits expert curation
Class: Maxillopoda

Size (male): length 5.5 mm

The proportional length of the cephalothorax and abdomen are as 3 to 1.
The head and 1st thoracic segment are fused together, as also are the last two thoracic segments, but between these two latter segments there is in the lateral region a deep indentation of the margin. There is no frontal crest. The rostrum consists of two stout spines, each tapering to a sharp point.

The abdomen consists of five segments, of which the 5th is very short.The furcal rami are as broad as long. Abdominal segments 2 and 3 are armed along their posterior margins with rows of fine closely-set spines.

In the 1st antenna, segments 8 to 12 inclusive are fused together, though traces of the original lines of separation can be detected between them; and segments 20 and 21 also appear to be fused. In the 2nd antenna, a tuft of curved setae or hairs arises from the basal segment.

The 1st pair of swimming legs consists each of a two-jointed basal portion, a three-jointed exopod and an unjointed endopod. Each segment of the exopod bears a single marginal spine, those on the proximal and middle segments being slender, while that on the distal segment is stout. The distal segment is clothed along the proximal half of its outer border with fine hair.

The 2nd swimming leg has a three-jointed exopod and a two-jointed endopod. There are more spinules on the surface of the 2nd and 3rd segments of the exopod.

The 3rd and 4th pairs of legs each consist of a three-jointed exopod and endopod.

In the 5th pair of legs, the exopod of the right leg consist of three segments.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• INDIA (Record: 23/04/1924)

Literature Source(s)
  • Sewell, RBS (1999) The copepoda of Indian seas Biotech Books, Delhi, India 407 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2010-07-19

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