Chirundina indica   Sewell,  1929 (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Calanoida
Family:Aetideidae

Image copyrights: Biotech Books

Female: The whole animal from above

Description
Size (female): length 4.19-4.75 mm

The proportional lengths of the cephalothorax and abdomen are as 4.7 to 1. The forehead is somewhat prominent, so that in side view the head has a truncated appearance. There is a low median crest that is very much less marked. The rostrum is well developed and is diredted downwards and forwards. The head and 1st thoracic segments, as also thoracic segments 4 and 5 are fused together. The posterior thoracic margin is produced slightly backwards and is rounded; it shows no trace of any projecting process.
The abdomen consists of four segments with furcal rami. The genital segment is symmetrical and ventrally presents a well-marked swelling. The 2nd and 3rd segments are armed along their posterior margins with fine needle-like spines. The 4th segment bears a tuft of hairs ventrally. The furcal rami are as broad as long and bear only four setae, all of nearly equal length; both inner and outer margins are fringed with hair and the accessory seta is small. The 1st antenna reaches back as far as the 3rd segment of the abdomen. The 8th and 9th segments are completely fused and the 24th and 25th segments partially so. In the 2nd antenna the endopod is approximately half the length of the exopod; the distal segment bears 8 and 6 setae on its inner and outer lobes, respectively. The 1st segment of the exopod bears a single seta with a thickened base, and the 2nd segment bears near its proximal end two setae, of which the first possesses a swollen base and the 2nd arises from a small swelling. The distal segment of the exopod is as long as segments 2 and bears at its extremity three setae, while a fourth arises half way along its length. The 1st basal segment bears a line of long hairs. The mandibular palp carries 9 setae on the endopod and 3 on the exopod. In the 1st maxilla, the basal segment bears five setae of which one is considerably thicker than the rest; the endopod carries 15 setae and the exopod 11. The 3rd inner lobe bears 5 setae. The maxilliped is long and slender, the 2nd basal segment being greatly elongated and the terminal ramus comparatively short; the proportional lengths of the two basal segments and the ramus are 28 : 50 : 15.The proximal part of the posterior margin of the 1st basal is armed with small spinules and is somewhat produced; distally there is rounded projection with thickened chitin. The second basal segment has a transparent lamella along the posterior margin, the middle of its length being usually concave. The 1st pair of legs have the usual two-jointed basal part and the exopod is two-jointed, while the endopod consists of a single segment. The 1st basal segment projects markedly inwards towards the median line. In the exopod the 1st and 2nd segments of the ramus are fused together, though traces of the original joint between them can be easily detected; the marginal spine on the proximal segment has been completely suppressed. The 2nd pair of legs possess a three-jointed exopod and an endopod that consists of only a single joint, the outer margin bears a sharp spinous process that marks the limit of the originally separate proximal segment. The 3rd and 4th legs are similar and are each composed of a three –jointed exopod and endopod. There are no spines on the posterior surface of the 1st basal segment of the 4th leg
The 5th pair of legs is absent.



Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• 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 - http://www.marinespecies.org

Page last updated on:2010-07-02

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