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Sexual dimorphism and biology of the large deepwater mastigoteuthid squid Idioteuthis cordiformis (Cephalopoda, Mastigoteuthidae) off Tasmania, Australia

Published online by Cambridge University Press:  20 August 2021

George D. Jackson Open the ORCID record for George D. Jackson [Opens in a new window]  and
Christine H. Jackson
George D. Jackson*
Affiliation:
Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA92354, USA
Christine H. Jackson
Affiliation:
Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA92354, USA
*
Author for correspondence: George D. Jackson, E-mail: GDJackson@llu.edu
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Abstract

This study provided biological information on 146 specimens of the poorly known deepwater mastigoteuthid squid Idioteuthis cordiformis. Mantle length ranged from 200–500 mm for males and 270–702 mm for females. The largest female weighed just under 12 kg. The majority of males were mature and all females were immature. The fins were larger and thicker than the mantle. Mantle weight of males and females was 44.8% and 55.2% of fin weight, respectively, and were significantly different. There was a significant sex effect on mantle length, total weight, mantle weight and fin weight, with females having greater values in all categories. There was a small season effect for mantle weight and fin weight. There was little ingested prey material except fluid and oil in the caecum that was typically bright orange or red. Total fluid volume ranged from 23–230 ml and 20–550 ml for males and females, respectively. The per cent oil component of total fluids in the caecum ranged from 6.9–50% and 10.8–50% for males and females, respectively, with no significant difference in per cent oil between males and females. There was a significant positive relationship between total weight and oil volume for females, and for males and females combined. The function of the oil is uncertain. While this study provided information on sex differences in the body size, sexual dimorphism and caecum oil content, information is still incomplete regarding reproduction due to the lack of any mature females captured in this study.

Keywords

Deep-sea cephalopodmaturityoegopsid squidreproduction
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 101 , Issue 4 , June 2021 , pp. 717 - 723
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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