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Title: How many pygmy marmoset (Cebuella Gray, 1870) species are there? A taxonomic re-appraisal based on new molecular evidence
Authors: Boubli, Jean Philippe
Silva, Maria Nazareth Ferreira da
Rylands, Anthony B.
Nash, Stephen David
Bertuol, Fabrício
Nunes, Mário S.
Mittermeier, Russell A.
Byrne, Hazel
Silva, Felipe Ennes
Röhe, Fábio
Sampaio, Iracilda C.
Schneider, Horácio
Farias, Izeni P.
Hrbek, Tomas
Keywords: Cytochrome B
Bayes Theorem
Dna Sequence
Isolation And Purification
Statistical Model
Bayes Theorem
Cytochromes B
Likelihood Functions
Sequence Analysis, Dna
Issue Date: 2018
metadata.dc.publisher.journal: Molecular Phylogenetics and Evolution
metadata.dc.relation.ispartof: Volume 120, Pags. 170-182
Abstract: The pygmy marmoset, Cebuella pygmaea, the smallest of the New World monkeys, has one of the largest geographical distributions of the Amazonian primates. Two forms have been recognized: Cebuella pygmaea pygmaea (Spix, 1823), and C. p. niveiventris Lönnberg, 1940. In this study, we investigated if the separation of pygmy marmosets into these two clades can be corroborated by molecular data. We also examine and compare coloration of the pelage in light of the new molecular results. We analyzed the mtDNA cytochrome b gene and, for the first time for any Neotropical primate, we used a reduced representation genome sequencing approach (ddRADseq) to obtain data for recently collected, geographically representative samples from the Rio Japurá a northern tributary of the Rio Solimões and from the Javarí Jutaí Juruá Madeira and Purus river basins, all tributaries south of the Solimões. We estimated phylogenies and diversification times under both maximum likelihood and Bayesian inference criteria. Our analysis showed two highly supported clades, with intraclade divergences much smaller than interclade divergences, indicating two species of Cebuella: one from the Rio Japurá and one to the south of Solimões. The interpretation of our results in light of the current taxonomy is not trivial however. Lönnberg stated that the type of Spix's pygmy marmoset (type locality ‘near Tabatinga’) was obtained from the south of the Solimões, and his description of the distinct niveiventris from Lago Ipixuna, south of the Solimões and several hundred kilometres east of Tabatinga, was based on a comparison with specimens that he determined as typical pygmaea that were from the upper Rio Juruá (south of the Solimões). As such it remains uncertain whether the name pygmaea should be applicable to the pygmy marmosets north of the Rio Solimões (Tabatinga type locality) or south (near Tabatinga but across the Solimões). Finally, our analysis of pelage coloration revealed three phenotypic forms: (1) south of the Rio Solimoes, (2) Eirunepé-Acre, upper Juruá basin; and (3) Japurá. More samples from both sides of Solimões in the region of Tabatinga will be necessary to ascertain the exact type locality for Spix's pygmaea and to resolve the current uncertainties surrounding pygmy marmoset taxonomy. © 2017 Elsevier Inc.
metadata.dc.identifier.doi: 10.1016/j.ympev.2017.11.010
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