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aqua 17(4)_Catshark egg

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Volume 17, Issue 4 – 15 October 2011

Brett A. Human: Description of a unique catshark egg capsule (Chondrichthyes: Scyliorhinidae) from the North West Shelf, Western Australia, pp. 199-209

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Description

SINGLE PAPER

Volume 17, Issue 4 – 15 October 2011

Brett A. Human: Description of a unique catshark egg capsule (Chondrichthyes: Scyliorhinidae) from the North West Shelf, Western Australia, pp. 199-209

Abstract

A review of the chondrichthyan reference collection of the Western Australian Museum led to the discovery of several lots of previously undescribed catshark egg capsules (Chondrichthyes: Scyliorhinidae) that initially could not be assigned to any particular genus due to their novel morphology. These egg capsules bear unique, well-developed ridges running longitudinally along the length of the egg capsule and are T-shaped in cross section, with one of these egg capsules having an embryo inside. The egg capsules and the embryo are described in detail, and compared against other genera of Australian catsharks. It is hypothesised that the egg capsules belong to the genus Apristurus Garman based on the gross morphology of the embryo. There are two candidate species of Australian Apristurus whose egg capsule remain unknown and to which genus the egg capsules could belong. However, based on the gross morphology of the embryo, it is possible that they represent an undescribed species.

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