Affiliation:
1. Department of Earth, Environmental, and Planetary Sciences Washington University in St. Louis St. Louis Missouri 63130 USA
2. Museum of Paleontology University of Michigan Ann Arbor Michigan 48109 USA
3. Department of Geosciences University of West Georgia Carrollton 30118 Georgia
4. Department of Earth and Planetary Sciences University of Tennessee Knoxville Tennessee 37996 USA
Abstract
AbstractGreat strides have been made in understanding the phylogeny of the five extant echinoderm classes, however, many Palaeozoic groups have yet to be examined in a rigorous, quantitative framework. The aberrant morphologies of Paracrinoidea, an unusual group of Palaeozoic echinoderms, have hindered their inclusion in large‐scale phylogenetic and morphologic studies. This study uses a combined approach of phylogenetic analysis and morphological disparity to elucidate species relationships within the clade. Findings from this study suggest that Paracrinoidea is a monophyletic group and that respiratory structures, oral plate arrangement, and ambulacral morphologies are important for defining subclades within Paracrinoidea. Examination of paracrinoids in a quantitative framework, facilitates their inclusion in larger projects examining Palaeozoic echinoderm evolution, ecology and biogeography.
Funder
Geological Society of America
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