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The last pteraspids (Vertebrata, Heterostraci): new material from the Middle Devonian of Alberta and Idaho

Published online by Cambridge University Press:  17 April 2020

David K. Elliott Open the ORCID record for David K. Elliott [Opens in a new window] ,
Linda S. Lassiter  and
Kathryn E. Geyer
David K. Elliott
Affiliation:
Division of Geology, School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona86011-4099, USA ,
Linda S. Lassiter
Affiliation:
Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona86011-5640, U.S.A.
Kathryn E. Geyer
Affiliation:
Division of Geology, School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona86011-4099, USA ,
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Abstract

This report documents the last pteraspids, (armored, jawless members of the Heterostraci), which are otherwise only known from the Early Devonian of the Old Red Sandstone Continent. Tuberculate pteraspid heterostracans are described from the Middle Devonian beds of two formations in western North America. The late Givetian Yahatinda Formation of Alberta and British Columbia consists of channels cut into lower Paleozoic rocks and represents deposition in marine to littoral environments. Clavulaspis finis (Elliott et al., 2000a) new combination is redescribed from additional material from the Yahatinda Formation and reassigned to the new genus Clavulaspis because the original genus name is invalid. The Eifelian Spring Mountain beds of Idaho consist of a large channel that represents a clastic-dominated estuarine environment. It contains Scutellaspis wilsoni new genus new species, and the previously described species from the Spring Mountain beds is redescribed and reassigned to Ecphymaspis new genus, which was prompted by new material and a review of the validity of the original genus name. Phylogenetic analysis shows that these three new taxa form part of the derived clade Protaspididae.

UUID: http://zoobank.org/9cf09b21-cec1-4ce4-bc2b-658d0b515e10

Type
Articles
Information
Journal of Paleontology , Volume 94 , Issue 4 , July 2020 , pp. 758 - 772
Copyright
Copyright © 2020, The Paleontological Society

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