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Hurdiid radiodontans from the middle Cambrian (Series 3) of Utah

Published online by Cambridge University Press:  24 July 2017

Stephen Pates
Affiliation:
Department of Zoology, University of Oxford, Oxford, OX1 3PS, UK 〈stephen.pates@zoo.ox.ac.uk〉
Allison C. Daley
Affiliation:
Department of Zoology, University of Oxford, Oxford, OX1 3PS, UK 〈stephen.pates@zoo.ox.ac.uk〉 Oxford University Museum of Natural History, Oxford, OX1 3PW, UK Faculty of Geosciences and Environment, University of Lausanne, Sorge Géopolis, CH1015, Lausanne, Switzerland 〈allison.daley@unil.ch〉
Bruce S. Lieberman
Affiliation:
Division of Invertebrate Paleontology, Biodiversity Institute, University of Kansas, Lawrence, Kansas 66045, USA 〈blieber@ku.edu〉 Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045, USA

Abstract

Radiodontan body elements, some belonging to Peytoia and Hurdia and some unassigned, have been reported from the Langston Formation (Spence Shale Member), Wheeler Formation, and Marjum Formation of the middle Cambrian (Series 3) of Utah. These identifications are reassessed in light of recent work on the morphology of the radiodontan Hurdia. New specimens of Hurdia are identified from the Spence Shale, representing mouthparts (oral cones), cephalic carapace H-elements, frontal appendages, and a single isolated swimming flap. The shape of the H-elements allows H. victoria Walcott, 1912 to be identified from the Spence Shale for the first time. The flap is larger and more complete than any reported from the Burgess Shale and allows for a better understanding of the morphology of Hurdia swimming flaps. A 3D model of a Hurdia frontal appendage indicates that there is only one morph of Hurdia frontal appendage found in both species, and apparent morphological differences between disarticulated appendages reflect a preservational continuum caused by varying oblique angles relative to the seafloor. Peytoia should no longer be reported from the Spence Shale, but its presence is confirmed in the Wheeler and Marjum formations. New mouthparts (oral cones) of Hurdia from the Spence Shale and Peytoia from the Marjum Formation with surface textures of submillimeter-diameter raised nodes are described. These new features have not been observed in material from the Burgess Shale and suggest slight differences in preservation.

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Copyright © 2017, The Paleontological Society 

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