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The last pteraspids (Vertebrata, Heterostraci): new material from the Middle Devonian of Alberta and Idaho (2020)

Elliott, David K. ; Lassiter, Linda S. ; Geyer, Kathryn E.

Paleontological Society

In: Journal of Paleontology. 2020; 94(4): 758-772. Published 2020 Apr 17. doi: 10.1017/jpa.2020.9.

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Publication Date: 2020-04-17

Description: 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

Print ISSN: 0022-3360

Electronic ISSN: 1937-2337

Topics: Geosciences

Published by Paleontological Society

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Elrathia hensonensis nomen novum, new replacement name for Elrathia groenlandica Geyer and Peel, 2017 (Trilobita, Ptychopariacea) (2020)

Geyer, Gerd ; Peel, John S.

Paleontological Society

In: Journal of Paleontology. 2020; 94(5): 1007-1007. Published 2020 Mar 25. doi: 10.1017/jpa.2020.11.

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Publication Date: 2020-03-25

Description: In an article by Geyer and Peel (2017, p. 288), we inadvertently coined a species-group name, Elrathia groenlandica Geyer and Peel, 2017 for a trilobite species of the superfamily Ptychopariacea. This name is a junior homonym of Elrathia? groenlandica Poulsen, 1927 and is thus invalid (ICZN Article 57.2; see International Commission on Zoological Nomenclature, 1999). We therefore propose Elrathia hensonensis new name as the replacement name for E. groenlandica Geyer and Peel, 2017. The new species name is derived from the Henson Gletscher area, North Greenland, the region where the type locality of this species is located.

Print ISSN: 0022-3360

Electronic ISSN: 1937-2337

Topics: Geosciences

Published by Paleontological Society

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