Cytogenetics of Bolinus brandaris and phylogenetic inferences within the Muricidae (Mollusca: Gastropoda)

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Abstract:

The purple dye murex, Bolinus brandaris (Linnaeus, 1758), is a muricid gastropod common throughout the Mediterranean and along the Moroccan and Portuguese Atlantic coasts. In the present study, we confirmed the diploid chromosome number of 2n = 70 for this species, and established for the first time the karyotype, which comprised 12 metacentric, 15 submetacentric and eight subtelocentric chromosome pairs. To facilitate cytotaxonomic comparisons, we carried out a comparative karyological analysis through multidimensional scaling between B. brandaris and three other 2n = 70 muricid species (Hexaplex trunculus, Ocenebra erinaceus, and Stramonita haemastoma) for which chromosomal measurements have been previously published. The interpretation of the ideograms and the statistical analysis highlighted the closest similarity of B. brandaris and H. trunculus compared to S. haemastoma and O. erinaceus. Indeed, B. brandaris and H. trunculus showed the smallest dissimilarities both for relative length and arm ratio, with O. erinaceus presenting intermediate values, whereas the highest dissimilarities were found between H. trunculus and S. haemastoma for both data. The karyotypes of B. brandaris and H. trunculus (subfamily Muricinae) presented the highest proportions of metacentric chromosomes compared to the other two muricids analysed, suggesting that those karyotypes could be considered primitive within the 2n = 70 Muricidae studied so far. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 96, 185–193.

Keywords: Portugal; Ria Formosa; chromosomes; gastropods; karyotype; purple dye murex

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1095-8312.2008.01100.x

Affiliations: 1: Instituto Nacional de Recursos Biológicos (INRB, IP)/IPIMAR, Avenida 5 de Outubro s/n, P-8700-305 Olhão, Portugal 2: Centro de Ciências do Mar (CCMAR), EcoReach Research Group, Universidade do Algarve, Campus de Gambelas, P-8005-139 Faro, Portugal 3: Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, P-3810-193 Aveiro, Portugal 4: Instituto Nacional de Recursos Biológicos (INRB, IP)/IPIMAR, Avenida de Brasília, P-1449-006 Lisboa, Portugal

Publication date: January 1, 2009

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