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The role of beak shape in octopodid taxonomy

By R.S. Ogden, A.L. Allcock, P.C. Watts and J.P. Thorpe

Abstract

Beak shapes in nine species of Southern Ocean octopodids were measured using seven size-standardized ratios. The results were analysed using principal component analysis and discriminant function analysis and show that beak shape may be used as a taxonomic character to distinguish between genera, but not between species. Stepwise discriminant function analysis indicated that all seven ratios were required to maximize discrimination between beaks. A phenogram constructed from a matrix of Mahalanobis distances differed from a dendrogram produced from genetic data. This suggests that, although useful for discrimination, beak morphology is probably not suitable for constructing phylogenies

Topics: Marine Sciences, Biology and Microbiology, Zoology
Publisher: Sea Fisheries Research Institute
Year: 1998
OAI identifier: oai:nora.nerc.ac.uk:10131
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