Lophothrix frontalis f. minor     (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Calanoida
Family:Scolecitrichidae

Description
Size (female): 4.875-5.375 mm

The proportional lengths of the cephalothorax and abdomen are as 79 to 16, so that the abdomen is contained 4.5 times in the length of the anterior region of the body.
Both the frontal crest and the posterior margin of the thorax are less sharply rounded. The posterior border of the thorax reaches back half-way along the genital segment of the abdomen and also appears to be less sharply rounded.
The abdomen consists of four segments with the furcal rami.
The genital swelling on the ventral aspect of the 1st segment seems to be slightly less prominent than in the larger form. The posterior margins of segments 1 to 3 inclusive are armed with a row of fine needle-like spines and in addition, there is a row of fine needle-like spines across the dorsal aspect of segments 2 and 3 near the anterior border. The external furcal setae are short and delicate.
The 1st antenna extends back nearly to the posterior margin of the 3rd abdominal segment. Each consists of 24 free segments, segments 8 and 9 being fused.
In the 2nd antenna, the exopod bears 8 setae on the inner lobe and 6 on the outer.
In the 1st maxilla the masticatory lobe bears 13 setae. The 2nd inner lobe bears 2 and the 3rd 4 setae; the basal segment carries 5 setae and the 3 segments of the endopod have 3 setae each; the outer lobe possesses 7 long setae and 2 shorter ones and the exopod carries 9 setae. The distal portion of the endopod is armed with rows of minute spines.
In the mandible the basal segment bears 3 setae; the exopod has 6 and the 1st segment of the endopod carries 2.
In the maxilliped, the posterior margin of the basal segment seems to be more produced and more sharply pointed in the smaller form.
There are minute differences from the larger form in the spination of the swimming leg.
In the 5th pair of legs, the terminal segment of the leg is shorter in proportion to its breadth and in some examples the separation from segment 2 was incomplete.




Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• INDIA (Record: 1910-1925)

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:2009-08-05

Back to Search