The role of ontogeny on character polarization in early dinosaurs: a new specimen from the Late Triassic of southern Brazil and its implications
| Autor: | Max C. Langer, Cristian Pereira Pacheco, Sérgio Dias-da-Silva, Rodrigo Temp Müller |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Synapomorphy 010506 paleontology Dinosauriformes biology Ontogeny Sauropodomorpha Zoology Dinosauromorpha biology.organism_classification 010603 evolutionary biology 01 natural sciences Taxon Pampadromaeus General Agricultural and Biological Sciences Clade 0105 earth and related environmental sciences |
| Zdroj: | Historical Biology. 31:794-805 |
| ISSN: | 1029-2381 0891-2963 |
| DOI: | 10.1080/08912963.2017.1395421 |
| Popis: | Only recently, new ontogenetic series of early dinosaurs and related groups have been described. Here, we present an isolated immature dinosauriform femur from the Late Triassic of southern Brazil and investigate its influence on character polarization. Because the specimen shares a number of synapomorphies with Pampadromaeus barberenai, herein we postulate that it corresponds to a juvenile individual of that taxon. Accordingly, we investigate the morphological variation between juvenile and mature individuals of P. barberenai. Scoring these character states into a published phylogenetic data-set of Dinosauromorpha reveals that morphological variation is higher than that observed among closely-related taxa. Ontogenetic variation thus exerts influence on character polarization. In addition, modification of the scores affected by ontogeny produces different topologies, as noted by the reduction in both the number of most parsimonious trees and number of steps, and increased inclusivity of some clade... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|