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Siluro-Devonian Scutelluinae (Trilobita) from the Czech Republic: morphology and classification

Published online by Cambridge University Press:  20 May 2016

Harry B. Whittington
Harry B. Whittington*
Affiliation:
Sedgwick Museum, Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom
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Abstract

Complete exoskeletons of species of eight genera of Siluro-Devonian Scutelluinae show the morphology of the cephalon and thorax, particularly glabellar lobation, the wide inward extent of the doublure, and the development of fulcral processes and sockets, the latter more prominent on the external surface in stratigraphically younger species. The thorax of ten segments has axial rings with an articulating furrow and halfring as in most trilobites. The differences between the exoskeletons of Scutelluinae and Illaenidae are many, and imply anatomical differences. It is considered that Scutelluinae are related to the Ordovician Stygininae, and are to be united with them in Styginidae; a common origin for Styginidae and Illaenidae appears questionable.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 3 , May 1999 , pp. 414 - 430
Copyright
Copyright © The Paleontological Society 

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