Abstract # 2500 Event # 196:

Scheduled for Monday, September 21, 2009 09:15 AM-09:25 AM: Session 19 (Del Mar Room) Oral Presentation


H. Schneider1, J. R. Bernardi1, D. B. Cunha1, C. H. Tagliaro1, S. F. Ferrari2 and I. Sampaio1
1Universidade Federal do Para - Instituto de Estudos Costeiros, Bragança, Pará 68600-000, Brazil, 2Universidade Federal de Sergipe, Departamento de Biologia

Our ongoing research into the phylogeny of the platyrrhines has revealed the limitations of the use of a single molecular marker for the evaluation of the relationships within a group. We used two mitochondrial DNA genes (16S and D-loop) and the intron 2 of the nuclear Epsilon gene to the re-examination of the status of Callibella, a new genus recently proposed. The mtDNA 16S resulted in an unresolved polytomy and, despite our expectations, the gene was unable to elucidate even the most recent branching events within the platyrrhine radiation. By contrast, the much larger D-loop sequence was more informative. The results obtained here were somewhat different from those of van Roosmalen and van Roosmalen (2003). Interestingly, while the divergence values recorded by those authors were similar to those recorded in the present study for most comparisons, e.g. for Cebuella vs. Mico, the divergence of Callibella and Mico [12-13%] are much higher than those recorded here [~8.5%]. Analysis of intron 2 of the nuclear gene provided an alternative topology, in which Cebuella and Callibella appear as a sister group. However, the bootstrap support for this arrangement was far from convincing, such as they do not appear to challenge the conclusions significantly. The sum of the evidence obtained here contradicts the classification of C. humilis as a distinct genus within the Callitrichinae.