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Lower Devonian calmoniid trilobites from the Argentine Precordillera: new taxa of the Bouleia Group, and remarks on the tempo of calmoniid radiation

Published online by Cambridge University Press:  01 May 2009

Gregory D. Edgecombe ,
Norberto E. Vaccari  and
Beatriz G. Waisfeld
Gregory D. Edgecombe
Affiliation:
Division of Earth and Environmental Sciences, Australian Museum, PO Box A285, Sydney South, NSW 2000, Australia
Norberto E. Vaccari
Affiliation:
Câtedra de Estratigrafía y Geologia Histórica, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, CONICET, Avenida Vélez Sârsfield 299, 5000 Córdoba, Argentina
Beatriz G. Waisfeld
Affiliation:
Câtedra de Estratigrafía y Geologia Histórica, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, CONICET, Avenida Vélez Sârsfield 299, 5000 Córdoba, Argentina
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Abstract

New calmoniids from the Lower Devonian Talacasto Formation in the Precordillera of San Juan, Argentina, extend the stratigraphic and geographic ranges of a clade including Bouleia Kozlowski, 1923 and Parabouleia Eldredge, 1972. The new genus Talacastops accommodates the Lochkovian T. zarelae sp.nov. from the Talacasto Formation and a closely related species from western Bolivia (Talacastops sp.nov. A). The diagnosis of Parabouleia is broadened to include P. eldredgei sp.nov., from Lochkovian strata in the lower part of the Talacasto Formation. Calmoniids from below the Scaphiocoelia Assemblage Zone display morphological disparity that rivals later occurrences, and do not conform to a model of gradual transformation of an acastomorph ancestor. Stratigraphic range extensions based on correction for ghost lineages imply a high diversity within Calmoniidae very early in the Devonian.

Type
Articles
Information
Geological Magazine , Volume 131 , Issue 4 , July 1994 , pp. 449 - 464
Copyright
Copyright © Cambridge University Press 1994

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