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Ordovician cheirurid trilobites from the Argentine Precordillera

Published online by Cambridge University Press:  20 May 2016

Gregory D. Edgecombe ,
Brian D. E. Chatterton ,
Norberto E. Vaccari  and
Beatriz G. Waisfeld
Gregory D. Edgecombe
Affiliation:
Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia,
Brian D. E. Chatterton
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
Norberto E. Vaccari
Affiliation:
Instituto de Geología y Minería, Universidad Nacional de Jujuy, Avenida Bolivia 1661, C.C. 258, San Salvador de Jujuy, Argentina
Beatriz G. Waisfeld
Affiliation:
Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, 1405 Buenos Aires, Argentina
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Abstract

New cheirurid trilobite species from the Las Aguaditas Formation in San Juan Province include the Llanvirn Macrogrammus rafi, and the Early Caradoc Ceraurinella zhoui, Nieszkowskia jakei, and N. yongyii. Precordilleran species, such as the Llanvirn Macrogrammus pengi new species from the Gualcamayo Formation, reinforce sinoparapilekiinid affinities for the poorly known Macrogrammus Whittard, 1966, although the monophyly of Sinoparapilekiini requires corroboration. The ontogeny of Ceraurinella zhoui confirms the presence of early protaspid stages for this genus (and Cheirurinae in general). Rare cheirurids include species of Heliomeroides, Pateraspis, and an additional acanthoparyphinid.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 6 , November 1999 , pp. 1155 - 1175
Copyright
Copyright © The Paleontological Society 

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