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Laurentian origin of solutan echinoderms: new evidence from the Guzhangian (Cambrian Series 3) Weeks Formation of Utah, USA

Published online by Cambridge University Press:  13 March 2017

BERTRAND LEFEBVRE  and
RUDY LEROSEY-AUBRIL
BERTRAND LEFEBVRE*
Affiliation:
UMR CNRS 5276, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement, Campus de la Doua, Université Claude Bernard Lyon 1, 2 rue Raphaël Dubois, 69622 Villeurbanne, France
RUDY LEROSEY-AUBRIL
Affiliation:
Palaeoscience Research Centre, School of Environmental & Rural Science, University of New England, Armidale, New South Wales 2351, Australia
*
†Author for correspondence: bertrand.lefebvre@univ-lyon1.fr
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Abstract

A new solutan echinoderm, Pahvanticystis utahensis gen. et sp. nov. is described from the upper part of the Weeks Formation (Guzhangian). The Cambrian (Series 3) succession of the central House Range in western Utah documents the early diversification of the class Soluta, which is characterized by a major ecological transition from sessile, ‘pelmatozoan’ primitive taxa (Coleicarpus, Wheeler Formation), to more and more vagile, temporarily attached (Castericystis, Marjum Formation), to mostly unattached, ‘homalozoan’ derived forms (Pahvanticystis, Weeks Formation). The morphology of Pahvanticystis is remarkably intermediate between those of Castericystis and Minervaecystis. Its twisted, flattened dististele possibly represents an adaptation for a more efficient crawling atop soft substrates. This morphological feature also questions the phylogenetic relationships between syringocrinid and dendrocystitid solutans, and the possible evolution of the latter from basal, Pahvanticystis- or Minervaecystis-like syringocrinids by paedomorphosis.

Keywords

CambrianEchinodermataGuzhangianHouse RangeSolutaUtah
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 5 , July 2018 , pp. 1190 - 1204
Copyright
Copyright © Cambridge University Press 2017 

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