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Revision of the middle Cambrian trilobite Paradoxides jemtlandicus

Published online by Cambridge University Press:  29 June 2006

A. W. A. RUSHTON
A. W. A. RUSHTON
Affiliation:
Department of Palaeontology, Natural History Museum, London SW7 5BD, UK
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Abstract

Paradoxides jemtlandicus Wiman, 1903, from strata near the boundary between the oelandicus Stage and the paradoxissimus Stage of the middle Cambrian in central Sweden, is redescribed using more complete specimens than were known hitherto. It is one of the earliest species of the genus Paradoxides sensu stricto, and though the form of the dorsal exoskeleton and the transverse shape of the hypostome are normal for the genus, compared with typical Paradoxides such as P. paradoxissimus it shows features that can be regarded as primitive. These features include the shape of the glabella, the lack of strong fusion of the rostrum with the hypostome, the acute inner spine angle of the librigena and the short pygidium; they are reminiscent of some species of Hydrocephalus.

Keywords

trilobitesParadoxidesmiddle CambrianJämtlandSweden
Type
Original Article
Information
Geological Magazine , Volume 143 , Issue 6 , November 2006 , pp. 771 - 776
Copyright
© 2006 Cambridge University Press

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