Pseudodiaptomus burckhardti   Sewell,  1932 (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Calanoida
Family:Pseudodiaptomidae

Image copyrights: Biotech Books

a. The whole animal from the dorsal side

Description
Size (female): length 1.07 mm.

The length of the cephalothorax and abdomen are in the proportion of 53 to 25, so that the posterior region of the body is contained very nearly twice in the length of the anterior region.The head and 1st thoracic segment are separate, but segments 4 and 5 are fused together. The posterior thoracic margin is produced backwards in a sharp spine and a second smaller spine is situated in the dorso-lateral region, a little in front of the actual margin of the segment; in addition, the posterior margin extending from the lateral spine towards the dorsum bears a row of minute spinules.
The abdomen consists of the usual four free segments and the furcal rami
The genital segment is somewhat longer, and is swollen especially on the left side, where it is produced in a rounded prominence covered with a group of small spines; a row of small spines runs across the ventral aspect of the segment in front of the genital aperture. The posterior margins of segments 1 and 2 are devoid of spines; the 3rd segment bears on each side a tuft of long hair-like spines. The anal segment is considerably longer than either of the preceding two, being almost exactly equal to their combined length. The furcal rami are as long as the anal segment and are symmetrical. They are three times as long as broad and are fringed with hair on the inner margins. The 2nd distal seta is the longest and is five times as long as the furcal segment.The 1st antenna consists of 25 segments and reaches back to about the posterior border of the 2nd abdominal segment.
The seta of the third last segment seems to be modified in to a comb-like structure.The swimming legs are of the usual type. In the 1st swimming leg the 1st basal segment is produced on its outer margin in a rounded swelling; the two rami are of nearly equal length; exopod 1 bears a delicate marginal spine; exopod 2 is devoid of any spine; and exopod 3 possesses two very delicate marginal spines and an end-spine that is also very delicate and is approximately equal in length to the combined 2nd and 3rd segments.
In the 2nd, 3rd and 4th swimming legs the proximal marginal spine on exopod 3 is markedly reduced in size.It possess two marginal spines on each side of the 5th thoracic segment and by the fine spines that run along the posterior margin, as well as by the proportionate lengths of the abdominal segments.



Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• Andaman and Nicobar Islands, Nicobar, Nankauri Harbour INDIA
• Andaman and Nicobar Islands, Macpherson Strait INDIA

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:2011-03-15

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