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Genetic and morphological evidence that the eastern Pacific damselfish Abudefduf declivifrons is distinct from A. concolor (Pomacentridae)


Genetic and morphological evidence that the eastern Pacific damselfish Abudefduf declivifrons is distinct from A. concolor (Pomacentridae)



Copeia(2): 7-88



ISSN/ISBN: 0045-8511

DOI: 10.2307/1446891

No consensus exists in the systematic literature about whether the Mexican night-sergeant, Abudefduf declivifrons, from Baja California and the Sea of Cortez, is distinct from the Panamic night-sergeant, Abudefduf concolor, from the rest of the tropical eastern Pacific. We present evidence from electrophoretic comparisons of proteins, nucleotide sequence comparisons of the cytochrome oxidase I gene of mitochondrial DNA, and quantitative comparisons of morphology. All agree that the two nominal species are distinct. Based on analysis of isozyme and mitochondrial DNA data from the Caribbean species of night-sergeant, Abudefduf taurus, we suggest that A. declivifrons split from the lineage leading to A. concolor and A. taurus before the Pliocene rise of the Isthmus of Panama. The two night-sergeants from the eastern Pacific differ significantly in body, snout, and caudal peduncle depth and can be distinguished by the condition of the suborbital margin (adnate in A. concolor, semi-adnate or exposed in A. declivifrons).

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Accession: 017919795

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