Euchirella maxima   Wolfenden,  1905 (Copepod)
Organism information awaits expert curation
Class: Maxillopoda

Size: length 6.1 to 7.2 mm.

In female the total length is 4.0mm and the proportional lengths of the cephalothorax and abdomen are as 7 to 1. The forehead shows the triangular crest that is characteristic of the adult. The rostrum is short and stout and between it and the crest is a small projection that bears two short hairs. The cephalon and 1st thoracic segment are fused but the line of fusion between them is clearly visible. Thoracic segments 4 and 5 are also fused together. The posterior margin is rounded, but in the lateral region, where in the adult stage there is a well-marked backwardly directed flap, there is in this stage only a slight irregularity in the uniform curve of the margin and a thickening of the chitin. The abdomen is short and consists of only three segments, which have, with the furcal rami. The second segment is armed along the dorsal part of the posterior margin with a row of fine spines.
The 1st antenna closely resembles that of the adult, except that segments 24 and 25 have not yet become fused. Segments 8 and 9 are, as in adult, also fused, so there are 24 free joints in the appendage.
The 2nd antenna and mouth-parts in their general form closely resemble those of the adult; the number of setae borne by the various appendages is ,however, smaller.
In the mandible the exopod bears 6 setae as in the adult; but the endopod appears to possess only 7.
In the 1st maxilla the 2nd inner lobe bears a single seta and the 3rd inner lobe three, of which one is large and the other are small. The basal segment carries a single large seta and two small ones, and the endopod bear three setae, as in the adult. The outer lobe appears to have only five setae and the exopod bears only 9.
In the 1st swimming leg both rami consist of only a single segment; the exopod however, bears on its outer margin three marginal spines, the proximal two of which are situated close together and are smaller than the distal.
In the 2nd swimming leg the exopod consists of two segments, of which the proximal bears a single marginal spine and the distal bears three. The end-spine is about as long as the distal segment and is coarsely serrated. The endopod consists of a single segment.
In the 3rd and 4th swimming legs the exopod also consists of two segments and the endopod also possesses two. There is no trace of any spine on the 1st basal segment of the 4th leg.

Synonym (s)
Euchirella maxima Wolfenden, 1905
Euchirella maxima Farran, 1908
Euchirella maxima A. Scott, 1909
Euchirella maxima Wolfenden, 1911
Euchirella maxima Sewell, 1913
Euchirella maxima With, 1915
Euchirella maxima Sars, 1925

Common Name (s)
Economic Importance and Threats



• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• INDIA (Record: 21/10/1911, 23/04/1924)

Literature Source(s)
  • Manakadan, R and Pittie, A (2002) Standardized english and scientific names of the Indian subcontinent-2002 Newsletter for Birdwatchers S. Sridhar 42 p 35
  • 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 -
  • Marine Species Identification Portal Available at -

Page last updated on:2011-09-12

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