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Ontogeny of the proetoid trilobite Stenoblepharum, and relationships of a new species from the Upper Ordovician of Argentina

Published online by Cambridge University Press:  14 July 2015

Gregory D. Edgecombe ,
Brian D. E. Chatterton ,
Norberto E. Vaccari  and
Beatriz G. Waisfeld
Gregory D. Edgecombe
Affiliation:
1Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia
Brian D. E. Chatterton
Affiliation:
2Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
Norberto E. Vaccari
Affiliation:
3CONICET, Cátedra de Estratigrafía y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, C.C. 395, 5000 Córdoba, Argentina
Beatriz G. Waisfeld
Affiliation:
3CONICET, 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

Silicified material from the Early Caradoc part of the Las Aguaditas Formation in San Juan Province, Argentina, includes a nearly complete growth series for a new species of the tropidocoryphid Stenoblepharum Owens, 1973. Cladistic analysis of Stenoblepharum species indicates that S. astinii new species is most closely allied to the Early Caradoc S. strasburgense (Cooper, 1953) from Virginia. Chinese species of Stenoblepharum are sister group to a Baltic/Laurentian clade. A single adult-like protaspid stage occurs in the life cycle of S. astinii, closely resembling the protaspis of Decoroproetus. It is preceded by a non-adult-like first protaspid instar that appears to be characteristic of Proetoidea in general but contrasts markedly with the early larval stages of other taxa in Proetida.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 3 , May 1997 , pp. 419 - 433
Copyright
Copyright © The Paleontological Society 

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