Pseudanthessius brevicauda   Ummerkutty,  1967 (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Poecilostomatoida
Family:Pseudanthessiidae

Description
Size: 1.13 mm (female).

First prosomal segment is very large and broader than long. Second and third segments gradually diminish both in length and width and are produced backwards at their postero-lateral corners. Last prosomal segment is short and partly overlapped by the preceding segment. Caudal ramus is very short, as long as broad. Cephalosomal appendages, especially maxillule and maxilla, are robust. The endopod of the fourth leg is half as long as exopod. Its inner margin is broken by two notches placed at equal distances. Fifth leg consists of spindle-shaped spine and two setae. The proximal half of the genital segment is broad and its width is only a little less than the length of the segment.

Female: Prosome is large and ovoid and very distinctly demarcated from the urosome. First pedigerous segment is fused with the cephalosome and the combined cephalothorax is broader than long; it is the widest part of the prosome. The next two segments diminish gradually both in length and width. The postero-lateral corners of both these segments are prolonged backwards. The last prosomal segment is very small and is partly overlapped by the preceding segment. The first urosomal segment is normal. The genital segment is swollen in the anterior half but the demarcation between the two parts is not very pronounced. Guarding the genital apertures there is a pair of sharp spines. The next three urosomal segments are small and their combined length is just that of the genital segment. Caudal ramus is short, nearly as long as broad. Antennule is 7-jointed. Antenna, mandible, maxillule, maxilla are stoutly built. In the antenna the third segment is not exceedingly short. Mandible has a chitinous rod-like process extending postero-laterally; the distal end of the process shows fine denticulation. The terminal spines of the maxillule are strong and broad-based. In the maxilla the teeth on the apical lash are very strong. The fourth endopod is half the length of the exopod. Its inner margin shows two breaks at equal distances, both accompanied by notches. The first two-thirds of the length of the inner margin are lined with fine setae. Fifth leg consists of a graceful spindle-shaped spine serrated along both margins and two short setae. One of the setae is close to the base of the spine while the other is a little removed.


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• Tamil Nadu, Gulf of Mannar (Lat: 8.5) (Long: 79) INDIA
• Tamil Nadu, Gulf of Mannar INDIA (Record: 03/11/1960)
• Tamil Nadu, Vedalai INDIA (Record: 03/11/1960) (Depth: 2 mts)

Literature Source(s)
  • Humes, AG and Jan, HS (1973) A revision of the family Lichomolgidae Kossmann, 1877, Cyclopoid Copepods mainly associated with Marine Invertebrates Smithsonian Contributions to Zoology Smithsonian Institution Press, Washington, D.C. 127 1-368 Available at - NIO, RC Kochi
  • Ummerkutty, ANP (1966) Description of two species of cyclopoid copepods, Pseudanthessius anormalus n. sp. and P. brevicauda n. sp. Proceedings of Symposium on Crustacea Marine Biological Association of India, Mandapam Camp Part I 107-113 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
  • James, PSBR ; Thomas, PA ; Pillai, CSG and Achari Kumaraswamy, GP (1969) ´╗┐Catalogue of types and of sponges, corals, polychaetes, crabs and echinoderms in the reference collections of the Central Marine Fisheries Research Institute Bulletin of Central Marine Research Institute CMFRI, Cochin 7 1-66 Available at - http://eprints.cmfri.org.in/567/1/Bulletin_7.pdf

Page last updated on:2011-03-11

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