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Ordovician (Whiterock) calymenid and encrinurid trilobites from the Precordillera of Argentina

Published online by Cambridge University Press:  14 July 2015

Gregory D. Edgecombe ,
Brian D. E. Chatterton ,
Beatriz G. Waisfeld  and
Norberto E. Vaccari
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
Beatriz G. Waisfeld
Affiliation:
CONICET, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida ángel Gallardo 470, 1405 Buenos Aires, Argentina
Norberto E. Vaccari
Affiliation:
CONICET, Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299,C.C. 395, 5000 Córdoba, Argentina
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Abstract

Phacopida from upper Whiterock (Lower Caradoc) horizons in the Las Aguaditas Formation of San Juan Province, Argentina, include the calymenid Platycalymene trapezoidalis (Baldis and Pöthe, 1995) and the encrinurids Frencrinuroides edseli new species, Lasaguaditas oweni new genus and species, and Walencrinuroides? new species A. Sulcocalymene Baldis and Pöthe, 1995, a purported subgenus of Flexicalymene, is a junior subjective synonym of Platycalymene Shirley, 1936. Platycalymene is now known from Avalonia, Baltica, Laurentia (Scotland), and the Precordillera. Emending the cladistic analysis of Ordovician Encrinurinae by Lespérance and Desbiens (1995), the monophyly and membership of Frencrinuroides and Walencrinuroides are ambiguous. Frencrinuroides edseli is closely related to species from eastern Laurentia. Lasaguaditas new genus is superficially cybelinid-like in some respects but shares several derived characters with the Encrinurinae. All three encrinurinid species in the Las Aguaditas Formation possess two instars in the protaspid period, a general pattern in Ordovician encrinurinid ontogeny.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 4 , July 1998 , pp. 678 - 697
Copyright
Copyright © The Paleontological Society 

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