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South America’s earliest (Ordovician, Floian) crinoids

Published online by Cambridge University Press:  16 December 2015

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〉

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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Copyright © 2015, The Paleontological Society 

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References

Astini, R.A., 2008, Sedimentación, facies, discordancias y evolución paleoambiental durante el Cambro-Ordovícico, in Coira, B., and Zappetini, E.O., eds., Geología y recursos naturales de la Provincia de Jujuy: Relatorio del 17º Congreso Geológico Argentino, p. 5073.Google Scholar
Astini, R.A., and Waisfeld, B.G., 1993, Análisis estratigráfico y paleoambiental del Ordovícico inferior (Formaciones Acoite y Sepulturas) al Oeste de Purmamarca, Cordillera Oriental jujeña: 12º Congreso Geológico Argentino, v. 1, p. 96106.Google Scholar
Astini, R.A., Waisfeld, B.G., Toro, B.A., and Benedetto, J.L., 2004, El Paleozoico Inferior y Medio de la región de Los Colorados, borde occidental de la Cordillera Oriental (Provincia de Jujuy), Argentina: Revista de la Asociación Geológica Argentina, v. 59, p. 243260.Google Scholar
Bahlburg, H., and Furlong, K.P., 1996, Lithospheric modelling of the Ordovician foreland basin in the Puna- NW Argentina: on the influence of arc loading on foreland basin formation: Tectonophysics, v. 259, p. 245258.CrossRefGoogle Scholar
Bates, D.E.B., 1968, On Dendrocrinus cambriensis Hicks, the earliest known crinoid: Palaeontology, v. 11, p. 406409.Google Scholar
Benedetto, J.L., Vaccari, N.E., Waisfeld, B. G., Sanchez, T.M., and Folgia, R.D., 2009, Cambrian and Ordovician biogeography of the South American margin of Gondwana and accreted terranes, in Basset, M.G., ed., Early Paleozoic Peri-Gondwanan Terranes: new insights from tectonics and biogeography: Geological Society of London, Special Publication, v. 325, p. 201232.Google Scholar
Cope, J.C.W., 1988, A reinterpretation of the Arenig crinoid Ramseyocrinus: Palaeontology, v. 31, p. 229235.Google Scholar
Deline, B., and Ausich, W.I., 2011, Testing the plateau: a re–examination of disparity and morphologic constraints in early Paleozoic crinoids: Paleobiology, v. 37, p. 214236.CrossRefGoogle Scholar
Donovan, S.K., 1984, Ramseyocrinus and Ristnacrinus from the Ordovician of Britain: Palaeontology, v. 27, p. 623634.Google Scholar
Donovan, S.K., 1989, More about Ramseyocrinus Bates (Crinoidea): Journal of Paleontology, v. 63, p. 11241125.CrossRefGoogle Scholar
Donovan, S.K., and Savill, J.J., 1988, Ramseyocrinus from the Arenig of Morocco: Journal of Paleontology, v. 62, p. 283285.CrossRefGoogle Scholar
Eckert, J.D., and Brett, C.E., 1987, Stipatocrinus, a new and unusual camerate crinoid from the lower Silurian of Western New York: Royal Ontario Museum Life Sciences Contributions, v. 146, 17 p.Google Scholar
Fortey, R.A., and Cocks, L.R.M., 2003, Palaeontological evidence bearing on global Ordovician–Silurian continental reconstructions: Earth Science Reviews, v. 61, p. 245307.CrossRefGoogle Scholar
Guensburg, T.E., 1984, Echinodermata of the Middle Ordovician Lebanon Limestone, Central Tennessee: Bulletins of American Paleontology, v. 86, no. 319, 100 pp.Google Scholar
Guensburg, T.E., 2012, Alphacrinus new genus and origin of the disparid clade: Journal of Paleontology, v. 84, p. 12091216.CrossRefGoogle Scholar
Guensburg, T.E., and Sprinkle, J., 2003, The oldest known crinoids and a new crinoid plate homology system: Bulletins of American Paleontology, no. 364, 43 p.Google Scholar
Hicks, M., 1873, On the Tremadoc crinoids in the neighborhood of St. David’s, South Wales, and their fossil contents: Quarterly Journal of the Geological Society of London, v. 29, p. 3952.CrossRefGoogle Scholar
Kolata, D.R., 1975, Middle Ordovician Echinoderms from northern Illinois and Southern Wisconsin: Journal of Paleontology, v. 49, Memoir 7 74 p.Google Scholar
McCormick, T., and Fortey, R.A., 1999, The most widely distributed trilobite species, p. Ordovician Carolinities genacinaca: Journal of Paleontology, v. 73, p. 202218.CrossRefGoogle Scholar
Prokop, R.J., and Petr, V., 1999, Echinoderms in the Bohemian Ordovician: Journal of the Czech Geological Society, v. 44, p. 6368.Google Scholar
Rozhnov, S.V., 1988, Morphology and taxonomic position of Lower Ordovician crinoids: Paleontological Journal, no. 2, p. 6782 [English translation from Russian].Google Scholar
Sevastopulo, G.D., and Lane, N.G., 1988, Ontogeny and phylogeny of disparid crinoids, in Paul, C.R.C., and Smith, A.B., eds., Echinoderm Phylogeny and Evolutionary Biology: Oxford, Oxford University Press, p. 245253.Google Scholar
Stukalina, G.A., 1967, On taxonomic features of articulated stems of crinoids: Biostratigraphic Compendium, v. 3, p. 200205 [in Russian].Google Scholar
Stukalina, G.A., 1980, New species of quadrilaterial from the Ordovician of Khazakstan, Urals, and Eastern European platform, in Stukalina, G.A., ed., New Species of Ancient Plants and Invertebrates of the USSR, 5, Akademiia Nauk USSR: Moscow, Paleontologischeskii Institute, p. 8895.Google Scholar
Toro, B.A., 1997, La fauna de graptolitos de la Formación Acoite, en el borde occidental de la Cordillera Oriental Argentina, análisis bioestratigrafico: Ameghiniana, v. 34, p. 393412.Google Scholar
Toro, B.A., and Maletz, J., 2008, The proximal development in Cymatograptus (Graptoloidea) from Argentina and its relevance for the early evolution of the Dichograptacea: Journal of Paleontology, v. 82, p. 974983.CrossRefGoogle Scholar
Ubaghs, G., 1978, Skeletal morphology of fossils crinoids, in Moore, R.C., and Teichert, C., eds., Treatise on Invertebrate Paleontology, pt. T, Echinodermata 2(1): Boulder Colorado and Lawrence, Kansas, Geological Society of America and University of Kansas Press.Google Scholar
Ubaghs, G., 1983, Notes sur les echinoderms de l’Ordovicien inferior de la Montagne Noire (France), chapter III, in Calymenina, Echinodermata et Hyolitha de L’Ordovicien inferior de la Montagne Noire: Carcassonne, France, Mémoire de la Société d’Etudes Scientifiques de l’Aude.Google Scholar
Waagen, W., and Jahn, J.J., 1899, Systême silurien du centre de la Bohême, Recherches paléontologiques, in Barrande, J., Classe de échinodermes, part 2, Famille de crinoïdes, Prague and Leipzig, 215 p.Google Scholar
Wachsmuth, C., and Springer, F., 1885. Revision of the Paleaeocrinoidea, pt. 3, sec. 1. Discussion of the classification and relations of the brachiate crinoids, and conclusion of the generic descriptions: Academy of Natural Sciences of Philadelphia Proclamations, p. 64226.Google Scholar
Waisfeld, B.G., and Vaccari, N.E., 2003, Trilobites, in Benedetto, J.L., ed., Ordovician fossils of Argentina: Universidad Nacional de Córdoba, Secretaría de Ciencia y Tecnología, 561 p.Google Scholar
Waisfeld, B.G., and Vacarri, N.E., 2008, Oxygen–controlled Early Ordovician trilobite assemblages: the Thallasanopyge fauna from Northwest Argentina, in Râbano, I., Gonzalo, R., and García-Bellido, D., eds., Advances in Trilobite Research: Cuadernos del Museo Geominero, 9, p. 421425.Google Scholar

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