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Taxonomic status of Stylocheiron armatum Colosi 1917 (Crustacea : Euphausiacea) — A critical evaluatton

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Relation http://eprints.cmfri.org.in/1370/
 
Title Taxonomic status of Stylocheiron armatum Colosi 1917 (Crustacea : Euphausiacea) — A critical evaluatton
 
Creator Mathew, K J
 
Subject Crustacean Fisheries
 
Description Stylocheiron armatum originally described by Colosi (1917) closely resembles Stylocheiron carinatum
G.O. Sars (1883). Colosi described the species based on morphological differences observed with the
elongated third coiroopod and the male copulatory organ. The species was established partly on Sars'
(1883), Ortmann's (1893) and Hansen's (1910) S. carinatum and also on the specimens collected from the
Indian Ocean and the Caribbean Sea. However, the later workers without perhaps examining the tropical
euphausiids of the Indian Ocean, synonymised S. armatum with S. carinatum stating that the differences
between the two species in the petasma and the elongated thoracic leg were too small to give the status of
species to the former. In the course of a detailed study of Euphausiacea of the southeastern Arabian Sea,
the author had the opportunity to examine vast collections of euphausiids and this has enabled him to have
a closer look on the systematic position of S. armatum- The study has revealed that the morphological
characters between the two species are so distinct tltat a re-thinking on the validity of the S. armatum is
necessary. The material e5wmined by the author had characters more akin to S. armatum- In the present
communication a critical evaluation of the status of S. armatum is made. A revised key, incorporating some
new characters, for the identification of species and ' forms' of genus Styloclieiron is also presentel.
 
Publisher MBAI
 
Date 1980
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/1370/1/Math_50-56.pdf
Mathew, K J (1980) Taxonomic status of Stylocheiron armatum Colosi 1917 (Crustacea : Euphausiacea) — A critical evaluatton. Journal of the Marine Biological Association of India, 22 (1&2). pp. 50-56.