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Ontogeny and systematics of Toernquistiidae (Trilobita, Proetida) from the Ordovician of the Argentine Precordillera

Published online by Cambridge University Press:  20 May 2016

Brian D. E. Chatterton ,
Gregory D. Edgecombe ,
Beatriz G. Waisfeld  and
Norberto E. Vaccari
Brian D. E. Chatterton
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada
Gregory D. Edgecombe
Affiliation:
Division of Earth and Environmental Sciences, Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia
Beatriz G. Waisfeld
Affiliation:
División Paleozoología de Invertebrados, 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, 5000 Córdoba, Argentina
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Abstract

The following new Toernquistiidae from Whiterockian (Llanvirn to lower Caradoc) strata of the Precordillera, western Argentina, are described: Chomatopyge canasi new species, Lasarchopyge benedettoi new genus and species, Lasarchopyge correae new genus and species, Lasarchopyge new species A, and Paratoernquistia sanchezae new genus and species. Phylogenetic analysis suggests that the Toernquistiidae Hupé, 1953 (including Chomatopyge, Lasarchopyge, Mesotaphraspis, Paratoernquistia, and Toernquistia) is closely related to but distinct from the Dimeropygidae Hupé, 1953 (including Ischyrotoma, Ischyrophyma and Dimeropyge). It is difficult to find unique synapomorphies that unite toernquistiids and dimeropygids into a monophyletic group that excludes other proetides (e.g., hystricurids), although details of their ontogenies are similar. Several species of Toernquistiidae are known from the Argentine Precordillera (one species previously described), and other species of this family have been described from Australia, Baltica, China, Kazakhstan and Laurentia. Members of the Dimeropygidae are known only from Baltica and Laurentia.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 2 , March 1998 , pp. 273 - 303
Copyright
Copyright © The Paleontological Society 

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