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Occurrence of the Ordovician-type aglaspidid Tremaglaspis in the Cambrian Weeks Formation (Utah, USA)

Published online by Cambridge University Press:  29 May 2013

RUDY LEROSEY-AUBRIL ,
JAVIER ORTEGA-HERNÁNDEZ ,
CARLO KIER  and
ENRICO BONINO
RUDY LEROSEY-AUBRIL*
Affiliation:
UMR 5276 CNRS, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement, Campus de la Doua, Université Claude Bernard Lyon 1, 2 rue Raphaël Dubois, 69622 Villeurbanne, France
JAVIER ORTEGA-HERNÁNDEZ
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
CARLO KIER
Affiliation:
Back to the Past Museum, Carretera Cancún, Puerto Morelos, Quintana Roo 77580, Mexico
ENRICO BONINO
Affiliation:
Back to the Past Museum, Carretera Cancún, Puerto Morelos, Quintana Roo 77580, Mexico
*
†Author for correspondence: leroseyaubril@gmail.com
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Abstract

The Guzhangian Weeks Formation preserves a diverse, yet virtually unstudied, non-trilobite arthropod fauna. Here we describe Tremaglaspis vanroyi sp. nov., the oldest representative of an enigmatic group of extinct arthropods, the Aglaspidida. Tremaglaspis was previously known from the Lower Ordovician and its morphology was regarded as particularly derived within the clade. Its occurrence in the Cambrian of Utah suggests that much of the early evolutionary history of the Aglaspidida remains unknown. A review of the environmental settings of previous aglaspidid findings suggests that these arthropods preferentially inhabited shallow-water environments, which may partially explain their limited fossil record.

Keywords

AglaspididaArthropodaWeeks FormationKonzervat-LagerstätteCambrianGuzhangian
Type
Rapid Communication
Information
Geological Magazine , Volume 150 , Issue 5 , September 2013 , pp. 945 - 951
Copyright
Copyright © Cambridge University Press 2013 

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