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Deep echinoderm phylogeny preserved in organic molecules from Paleozoic fossils

Christina E. O'Malley, William I. Ausich and Yu-Ping Chin
Deep echinoderm phylogeny preserved in organic molecules from Paleozoic fossils
Geology (Boulder) (May 2016) 44 (5): 379-382

Abstract

Isolation of organic molecules directly from Paleozoic to Cenozoic fossils has been documented, which raises important, new questions about the conditions of preservation and the range of paleobiological issues that can be addressed with these new data. Herein, molecules are isolated from fossil echinoderms exceeding 445 Ma in age. Previously, morphological data have been insufficient to establish a consensus regarding early echinoderm evolution. Thus, organic molecules extracted from fossil echinoderm specimens (mostly Paleozoic) belonging to the classes Asteroidea, Blastoidea, Crinoidea, Diploporita, Echinoidea, and Edrioasteroidea are used to assess the position of crinoids and blastozoans within competing echinoderm phylogenetic hypotheses. Fluorescence excitation-emission spectroscopy of organic molecules in fossil extracts are used to compare relationships among hypotheses. These new data support the hypothesis that living eleutherozoans diverged early from stemmed echinoderms, crinoids are nested within the clade that includes other blastozoans, and edrioasteroids are a distinct clade.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 44
Serial Issue: 5
Title: Deep echinoderm phylogeny preserved in organic molecules from Paleozoic fossils
Affiliation: Carroll High School, Dayton, OH, United States
Pages: 379-382
Published: 201605
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 2016-054054
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2016124
Illustration Description: illus.
Secondary Affiliation: Ohio State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201626
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