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Sexual dimorphism in Stylocheiron indicum Silas and Mathew (Crustacea: Euphausucea)

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Relation http://eprints.cmfri.org.in/1368/
 
Title Sexual dimorphism in Stylocheiron indicum Silas and Mathew (Crustacea: Euphausucea)
 
Creator Mathew, K J
 
Subject Crustacean Fisheries
 
Description Many species of euphausiids are found sexually dimorphic, the characters being manifested with several
of their body organs. This phenomenon has been investigated in some species in detail and as a result
it has been found that the morphological variations between the two sexes are more pronoimced in species
of the genera namely Thysanoessa, Nematoscelis, Nematobrachion and Stylocheiron. The organs thus
found to vary in males and females are the antennules, their flagellae, photophores, lateral denticles on
carapace, abdominal segments, eye or even the preanal spine. Considering die manifestation of sexual
dimorphic characters in diverse body organs in euphausiids an attempt has been made here to study the
degree of sexual dimorphism in Stylocheiron indicum Silas and Mathew. Ir this species differences were
observed with some of the body parts in the adult males and females. In order to assess the magnitude
of such differences a few morphological characters were cwnpared in both the sexes statistically. Of the
characters examined it was found that the proportion of length to depth of the sixth abdominal segment,
and the proportion of the width of the upper part of the eye to the width of the lower part of the eye were
significantly different in the two sexes.
 
Publisher MBAI
 
Date 1980
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/1368/1/Math_39-44.pdf
Mathew, K J (1980) Sexual dimorphism in Stylocheiron indicum Silas and Mathew (Crustacea: Euphausucea). Journal of the Marine Biological Association of India, 22 (1&2). pp. 39-44.