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South America’s earliest (Ordovician, Floian) crinoids

Published online by Cambridge University Press:  16 December 2015

Thomas E. Guensburg  and
Beatriz G. Waisfeld
Thomas E. Guensburg
Affiliation:
Sciences Division, Rock Valley College, 3301 North Mulford Road, Rockford, Illinois 61114, USA 〈t.guensburg@rockvalleycollege.edu〉
Beatriz G. Waisfeld
Affiliation:
Centro de Investigaciones en Ciencias de lat Tierrra (CICTERRA), CONICET and Centro de Investigaciones Paloebiológicas (CIPAL–FCEFyN), Universidad Nacional de Córdoba, Av. Velez Sársfield 1611, Córdoba, Argentina 〈beawaisfeld@com.uncor.edu〉
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Abstract

Two new Early Ordovician crinoids have been discovered in Gondwanan rocks of northwest Argentina. Ramseyocrinus argentinus n. sp., among the most complete for the genus, aids in reconstructing key morphology. Ramseyocrinus is unorthodox with just four radials forming the entire cup, these articulating to five arms above and a tetrameric stem below. Evidence is presented radials comprise A, B, D, and E ray elements (C absent) with B and D radials adjoining to form a compound facet for the C arm. Thus the cup entirely lacks posterior plating; an elongate anal sac projects from the CD tegmen region alongside the C arm. Cup synapomorphies closely link Ramseyocrinus and the Middle Ordovician Tetragonocrinus; inclusion of this clade within disparids is tenuous. Quechuacrinus ticsa n. gen. and sp., increases the paleogeographic range of reteocrinid camerates, previously documented only from Laurentia. This taxon expresses synapomorphies characterizing the Late Ordovician Reteocrinus, demonstrating the antiquity of this morphotype.

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Articles
Information
Journal of Paleontology , Volume 89 , Issue 4 , July 2015 , pp. 622 - 630
Copyright
Copyright © 2015, The Paleontological Society 

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