Please use this identifier to cite or link to this item:
Title: Morphometric variation of extant platyrrhine molars: taxonomic implications for fossil platyrrhines
Author: Nova Delgado, Mónica
Galbany i Casals, Jordi
Martínez Pérez-Pérez, Alejandro
Keywords: Primats
Issue Date: 11-May-2016
Publisher: PeerJ
Abstract: The phylogenetic position of many fossil platyrrhines with respect to extant ones is not yet clear. Two main hypotheses have been proposed: the layered or successive radiations hypothesis suggests that Patagonian fossils are Middle Miocene stem platyrrhines lacking modern descendants, whereas the long lineage hypothesis argues for an evolutionary continuity of all fossil platyrrhines with the extant ones. Our geometric morphometric analysis of a 15 landmark-based configuration of platyrrhines' first and second lower molars suggest that morphological stasis may explain the reduced molar shape variation observed. Platyrrhine lower molar shape might be a primitive retention of the ancestral state affected by strong ecological constraints throughout the radiation of the main platyrrhine families. The Patagonian fossil specimens showed two distinct morphological patterns of lower molars, Callicebus like and Saguinus like, which might be the precursors of the extant forms, whereas the Middle Miocene specimens, though showing morphological resemblances with the Patagonian fossils, also displayed new, derived molar patterns, Alouatta like and Pitheciinae like, thereby suggesting that despite the overall morphological stasis of molars, phenotypic diversification of molar shape was already settled during the Middle Miocene.
Note: Reproducció del document publicat a:
It is part of: PeerJ, 2016, vol. 4, num. e1967, p. 1-26
Related resource:
ISSN: 2167-8359
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

Files in This Item:
File Description SizeFormat 
668070.pdf6.22 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons