Description of the egg cases of Dentiraja polyommata (Rajiformes: Rajidae) and Asymbolus pallidus (Carcharhiniformes: Scyliorhinidae) from Queensland, Australia

Cassandra L. Rigby, William T. White, Peter M. Kyne

Research output: Contribution to journalArticle

Abstract

Descriptions of the egg cases of Dentiraja polyommata (n = 16) and Asymbolus pallidus (n = 44) are provided from egg cases collected from a commercial trawl fishery off Swain Reefs, central Queensland, Australia. Egg cases of D. polyom-mata are rectangular, convex and golden-tan in colour and those of A. pallidus elongate, vase-shaped and golden. To de-termine if a comparative statistical non-metric multi-dimensional scaling approach could identify egg cases of species taken in the same region and fishery, egg cases were compared with the skate D. endeavouri and catsharks A. analis, A. rubiginosus and Figaro boardmani. The statistical approach clearly discriminated the species based on five proportional measurements and identified the morphometrics that separated genera and species. This approach is valuable in a fisheries context for accurate identification of visually similar egg cases that can assist management of oviparous chondrichthyans. A rare incidence of intraspecific chondrichthyan cannibalism was noted for A. pallidus males that consumed egg cases of their own species.

LanguageEnglish
Pages329-341
Number of pages13
JournalZootaxa
Volume4294
Issue number3
DOIs
StatePublished - 19 Jul 2017

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Rajiformes
Carcharhiniformes
Scyliorhinidae
Rajidae
egg masses
Queensland
egg
fishery
fisheries
cannibalism
Asymbolus
reefs
reef
incidence
color

Cite this

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title = "Description of the egg cases of Dentiraja polyommata (Rajiformes: Rajidae) and Asymbolus pallidus (Carcharhiniformes: Scyliorhinidae) from Queensland, Australia",
abstract = "Descriptions of the egg cases of Dentiraja polyommata (n = 16) and Asymbolus pallidus (n = 44) are provided from egg cases collected from a commercial trawl fishery off Swain Reefs, central Queensland, Australia. Egg cases of D. polyom-mata are rectangular, convex and golden-tan in colour and those of A. pallidus elongate, vase-shaped and golden. To de-termine if a comparative statistical non-metric multi-dimensional scaling approach could identify egg cases of species taken in the same region and fishery, egg cases were compared with the skate D. endeavouri and catsharks A. analis, A. rubiginosus and Figaro boardmani. The statistical approach clearly discriminated the species based on five proportional measurements and identified the morphometrics that separated genera and species. This approach is valuable in a fisheries context for accurate identification of visually similar egg cases that can assist management of oviparous chondrichthyans. A rare incidence of intraspecific chondrichthyan cannibalism was noted for A. pallidus males that consumed egg cases of their own species.",
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Description of the egg cases of Dentiraja polyommata (Rajiformes: Rajidae) and Asymbolus pallidus (Carcharhiniformes: Scyliorhinidae) from Queensland, Australia. / Rigby, Cassandra L.; White, William T.; Kyne, Peter M.

In: Zootaxa, Vol. 4294, No. 3, 19.07.2017, p. 329-341.

Research output: Contribution to journalArticle

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