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Differences in the otoliths support the distinction of the genus Macrodon into two species in the south-western Atlantic Ocean

Published online by Cambridge University Press:  19 September 2012

Luis Gustavo Cardoso ,
Simôni Santos  and
Manuel Haimovici
Luis Gustavo Cardoso*
Affiliation:
Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Caixa Postal 474, Avenida Itália Km 8, CEP 96201-900, Rio Grande, RS, Brazil
Simôni Santos
Affiliation:
Instituto de Estudos Costeiros, Universidade Federal do Pará, Campus de Bragança, Pará, Brazil
Manuel Haimovici
Affiliation:
Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Caixa Postal 474, Avenida Itália Km 8, CEP 96201-900, Rio Grande, RS, Brazil
*
Correspondence should be addressed to: L.G. Cardoso, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Caixa Postal 474, Avenida Itália Km 8, CEP 96201-900, Rio Grande, RS, Brazil email: [email protected]
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Abstract

Morphological differences in the otoliths of Macrodon atricauda from Rio Grande do Sul State (southern Brazil) and of M. ancylodon from Pará State (northern Brazil) were examined. Until recently, these were considered two populations of the same species. Although relatively similar in their general shape, those of large M. atricauda (>300 mm total length) were shorter and thinner and their outer surface was convex (those of the smallest specimens had a more lobullated antero-dorsal margin) whereas those of similarly sized M. ancylodon were larger, thicker and less lobullated. These features of the otoliths allow these morphologically similar species to be discriminated. The pattern of translucent and opaque bands in sectioned otoliths also differed. The otoliths of M. atricauda showed clear annual banding which allowed ageing, while those of M. ancylodon had no distinct alternate bands.

Keywords

otolithsspecies differentiationMacrodonsouth-western Atlantic
Type
Research Article
Information
Marine Biodiversity Records , Volume 5 , August 2012 , e93
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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