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The proximal development in Cymatograptus (Graptoloidea) from Argentina and its relevance for the early evolution of the Dichograptacea

Published online by Cambridge University Press:  14 July 2015

Blanca A. Toro  and
Jörg Maletz
Blanca A. Toro
Affiliation:
CONICET. Departamento de Geología y Paleontología, IANIGLA, Centro Regional de Investigaciones Científicas y Tecnológicas, C.C. 131, 5500 Mendoza, Argentina,
Jörg Maletz
Affiliation:
Department of Geology, University at Buffalo, SUNY, 772 Natural Science Complex, Buffalo, N.Y. 14260-3050, USA,
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Abstract

Cymatograptus bidextro sp. nov. from the Floian “Baltograptus deflexus” Biozone of northwest Argentina represents the oldest expansograptid with an artus type proximal development and a prosicular origin of the first theca. The species bears a variably dextral or sinistral proximal development, previously known exclusively from Tremadocian members of the Anisograptidae, but not from the Dichograptidae. The proximal development types of the Dichograptacea are shown to consist of several independently changing characters and cannot be used as phylogenetically useful descriptors. Proximal developments are more variable than expected and several independent origins of an artus type proximal development can be recognized in the Lower to Middle Ordovician.

Type
Research Article
Information
Journal of Paleontology , Volume 82 , Issue 5 , September 2008 , pp. 974 - 983
Copyright
Copyright © The Paleontological Society 

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