A comparative review of condylobasal lengths and other craniometric characters in 30 species of pinniped

• Published in: Polar Record
• Main Authors: Cruwys, E., Friday, A.E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1995
• Subjects: General Earth and Planetary Sciences; Ecology; Geography, Planning and Development; Mirounga leonina; Polar Record
• Online Access: http://dx.doi.org/10.1017/s0032247400024852; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400024852

ABSTRACT The condylobasal length (CBL) of skulls from 999 sexually mature seal, sealion, and fur seals of 30 different species was measured. Additional data gathered from previous studies were also included to give an indication of variation within each species, particularly where there is a wide geographical dispersion. Where possible, means and ranges of CBL were given separately for each sex, so that the degree of sexual dimorphism could be assessed. Previous studies have indicated that CBL continues to increase after sexual maturity has been reached. In order to assess this, three species ( Mirounga leonina, Otaria byronia (flavescens) , and Halichoerus grypus ) that contained individuals of known age were included in the study. Other craniometric characters are often expressed as a percentage of CBL when assessing taxonomic relationships. Some of these characters were reassessed using the new data.