Paraeuchaeta investigatoris   Sewell,  1929 (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Calanoida
Family:Euchaetidae

Description
Size (male): length 5.62 mm.

The proportional length of the cephalothorax and abdomen are as 2 to 1.
The forehead, as in most of the male forms in this genus, is rounded and the rostrum is directed downwards. The posterior thoracic margin is rounded and is produced backwards in a rounded lappet that is about three times the size on the left side of the body than it is on the right. On the dorso-lateral region there is a well developed spine-like projection. There are no hairy tufts on the posterior margins.

The abdomen consists of the usual five segments: the 5th or anal segment is extremely short and is telescoped into the 4th. The posterior margins of the 2nd, 3rd and 4th segments are armed across the dorsal part of the posterior margin with a row of coarse spines.

The furcal rami are but little longer than broad and the 2nd furcal seta is about, one and a half times the length of the others; the accessory seta is short being only about one-half times the length of the rest.

The 1st antenna reaches back to the middle of the 2nd segment of the abdomen. Segment 20 is devoid of an ‘aesthetask’ though segments 19 and 21 each bear one.

In the 2nd antenna, the exopod is about one and a half times the length of the endopod. Basal 1 bears a well-marked tuft of hairs and externally is produced in a blunt rounded prominence, but is devoid of setae. The endopod bears 6 setae on the outer lobe and 7 on the inner.
In the mandibular palp the exopod consists of five segments, of which the 3rd is produced in a rounded lobe. The endopod is two-jointed and bears 9 setae at its distal end.

The 1st maxilla is much reduced. The basal segment and endopod together bear 5 setae and the exopod carries 10. The outer lobe bears 5 setae.
In the maxilliped the basal segment bears at its distal end a straight slender seta and a stout short process that is thickly haired.

The 1st swimming leg consists of a two-jointed basal part and the exopod has three segments; the endopod consists as usual of a single segment. There is no spine on the 1st segment of the exopod, a very small hair taking its place.

In the 2nd leg, the 2nd marginal spine on the 3rd segment of the exopod is comparatively short and does not reach the middle of the interval between it and the 3rd marginal spine.

The 5th pair of legs have the form characteristic of the genus. The hand of the left leg is produced into a dentate lamella that is nearly as long as the palm. It bears a row of teeth on the outer margin and a line of five teeth on the inner border. The finger –like process is longer than the dentate and is transversely striated.



Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• Bay of Bengal INDIA (Record: 21/10/1911)

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 - http://www.marinespecies.org

Page last updated on:2011-03-14

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