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Spermatangium structure and implantation sites in onychoteuthid squid (Cephalopoda: Oegopsida)

Published online by Cambridge University Press:  14 January 2011

K.S.R. Bolstad  and
H.J.T. Hoving
K.S.R. Bolstad*
Affiliation:
Earth & Oceanic Sciences Research Institute, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand
H.J.T. Hoving
Affiliation:
Ocean Ecosystems, Centre for Ecological and Evolutionary Studies, University of Groningen, PO Box 14, 9750 AA Haren, The Netherlands
*
Correspondence should be addressed to: K. Bolstad, Earth & Oceanic Sciences Research Institute, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand email: kbolstad@aut.ac.nz
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Abstract

Reproduction remains poorly understood in the Onychoteuthidae, with information previously published on only six of the ~25 species, from three of the seven genera. Herein new information is presented for a further five species from four genera: mated and spent females are reported from the genera Onychoteuthis, Onykia, Notonykia and Callimachus, and the morphologies and locations of implanted spermatangia for the species Onychoteuthis meridiopacifica and Onykia aequatorialis are provided. Males of the genus Onychoteuthis are found to implant spermatangia within longitudinal cuts in the female's mantle surface, while males of Onykia implant individual spermatangia into the female's mantle at various locations, without a specific associated wound. These different implantation strategies are discussed in the context of mating and fertilization. A bulb-like structure at the aboral end of the spermatangium, possibly unique to the genus Onychoteuthis, is also described and examined and its function discussed. All onychoteuthids examined herein are observed to undergo extreme late-life physical degeneration.

Keywords

OnychoteuthidaeOegopsidamatingspermatophoresspermatangia
Type
Research Article
Information
Marine Biodiversity Records , Volume 4 , December 2011 , e5
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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