Molecular phylogeny and a chronology of diversification for "phractocephaline" catfishes (Siluriformes: Pimelodidae) based on mitochondrial DNA and nuclear recombination activating gene 2 sequences

Molecular Phylogenetics and Evolution
Michael Hardman, John G Lundberg

Abstract

The Maracaibo basin in northwestern Venezuela is home to over 108 species of freshwater fishes, over half of which occur nowhere else. The rise of the Mérida Andes between 8 and 10 million years ago is believed to have divided a preexisting biota and facilitated allopatric speciation. The distinctive "phractocephaline" clade of pimelodid catfishes has a distribution that includes the Maracaibo historically and today is represented by Perrunichthys (Maracaibo endemic), Leiarius, Phractocephalus, and Steindachneridion. A resolved and well-supported phylogeny was obtained from the phylogenetic analysis of over 3.4kb (including cytochrome b, NADH dehydrogenase subunit 1, recombination activating gene subunit 2). Rates of divergence among "phractocephalines" were calibrated with fossil material and the Mérida uplift. These independent calibrators provided different node-age estimates when the rates were applied separately to the gene partitions (mtDNA and rag2). Node-age discrepancies were particularly evident at older nodes. This is due to two factors: (1) multiple substitution of mtDNA underestimates the amount of change and therefore time since cladogenesis, whereas (2) calibration of an ancient node with fossils produces an arti...Continue Reading

References

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Citations

Dec 7, 2006·Biology Letters·Julia J Day, Mark Wilkinson
Feb 4, 2009·Evolution; International Journal of Organic Evolution·Ricardo Betancur-R, Jonathan W Armbruster
Feb 28, 2009·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Simone C Cohen, Anna Kohn
Feb 5, 2019·Molecular Ecology·Melissa Rincon-SandovalJavier A Maldonado-Ocampo
Jan 1, 2011·Animals : an Open Access Journal From MDPI·James S AlbertRoberto E Reis

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