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Can molecular data place each neotropical monkey in its own branch?
H Schneider1, F C Canavez, I Sampaio
1Division of Genetics, Instituto Nacional de Câncer, Rio de Janeiro, RJ, Brazil.
Chromosoma
|April 18, 2001
Summary
This study clarifies neotropical primate phylogeny using DNA data. It confirms three primate families and details evolutionary branching within Atelidae, Pitheciidae, and Cebidae, including callitrichines.
Area of Science:
- Primate evolutionary biology
- Molecular phylogenetics
- Neotropical biodiversity
Background:
- Understanding the evolutionary history of neotropical primates is crucial for conservation and understanding primate radiation.
- Previous phylogenetic studies have yielded varying results regarding the relationships between major platyrrhine families and genera.
Purpose of the Study:
- To resolve the phylogenetic relationships among extant neotropical primate genera using comprehensive DNA sequence data.
- To clarify the evolutionary branching patterns within the Atelidae, Pitheciidae, and Cebidae families.
- To investigate the relationships between major platyrrhine families and the placement of key genera.
Main Methods:
- Tandemly aligned four DNA datasets representing all neotropical primate genera.
- Analyzed 6,763 base pairs (bp) with 2,086 variable characters and 674 informative sites.
- Employed Maximum Parsimony, Maximum Likelihood, and Neighbor-Joining analyses, along with conjoint analysis.
Main Results:
- Confirmed the monophyly of three primate families: Atelidae, Pitheciidae, and Cebidae, which emerged concurrently during primate radiation.
- Resolved intra-familial relationships: Alouatta basal in Atelidae; Callicebus basal in Pitheciidae; Aotus, Cebus, Saimiri, and callitrichines grouped in Cebidae.
- Detailed callitrichine phylogeny: Cebuella with Callithrix, Callimico sister to Callithrix/Cebuella, Leontopithecus sister to that clade, and Saguinus as the earliest offshoot.
Conclusions:
- The study provides a robust molecular phylogeny for neotropical primates, clarifying relationships within and between major families.
- Identified key evolutionary divergences and branching patterns, contributing to a deeper understanding of primate diversification in South America.
- Highlighted remaining questions regarding the precise branching order of Aotus, Cebus, Saimiri, callitrichines, and the interrelationships of the three main families.