On the growth rings on Histioteuthis bonnellii (Férussac, 1835) upper beaks

MEREU, MARCO;Stacca D;CANNAS, RITA;CUCCU, DANILA

2011-01-01

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Abstract

The concentric rings present in the internal lateral wall of upper beaks of 109 Histioteuthis bonnellii (Cephalopoda: Histioteuthidae) caught in the south Sardinian waters were counted. From 142 to 409 and from 176 to 437 rings were counted in males and females, respectively. No difference was found between the number of rings among sexes (p>0.05). One year life-span was estimated in both sexes