Systematics of the Early Ordovician (late Tremadocian; Stairsian) trilobite Gonioteloides Kobayashi, with species from the Great Basin, western USA

The Early Ordovician (late Tremadocian; Stairsian) trilobite Gonioteloides Kobayashi has long been known from a small number of pygidia assigned to a single formally named species, and its affinities have not been assessed. Silicified material from western Utah and southeastern Idaho includes six di...

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Bibliographic Details
Published inJournal of paleontology Vol. 95; no. 5; pp. 1022 - 1047
Main Authors Adrain, Jonathan M., Karim, Talia S.
Format Journal Article
LanguageEnglish
Published New York, USA The Paleontological Society 01.09.2021
Cambridge University Press
Paleontological Society
Subjects
Affinity
Arthropoda
Basin and Range Province
Bear River Range
Dimeropygidae
Exoskeleton
exoskeletons
Extinct species
Fillmore Formation
Fossil animals
Garden City Formation
Gonioteloides
Great Basin
Idaho
invertebrate
Lower Ordovician
Marine invertebrates
Millard County Utah
Morphology
new taxa
Nomenclature
North America
ontogeny
Ordovician
Paleontology
Paleozoic
Phylogeny
REGULAR ARTICLES
Species
Stairsian
Stratigraphy
Systematics
taxonomy
Tremadocian
Trilobita
Trilobitomorpha
United States
Utah
Western U.S
Canada
United States > US
Colorado
Great Basin
Bear River
British Columbia Canada
Idaho
Utah
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Summary:The Early Ordovician (late Tremadocian; Stairsian) trilobite Gonioteloides Kobayashi has long been known from a small number of pygidia assigned to a single formally named species, and its affinities have not been assessed. Silicified material from western Utah and southeastern Idaho includes six distinct species assigned to the genus, one of which is the type species. Two others (G. moffitti and G. pankowskii) are new and formally named. An additional three species that are clearly new but known from sparse material are described in open nomenclature. Gonioteloides has a stratigraphic distribution through five consecutive trilobite zones in the mid-Stairsian Stage (upper Tremadocian). Although exoskeletal morphology of three species is almost completely known, the phylogenetic affinity of the taxon remains difficult to determine. It is tentatively assigned to Dimeropygidae Hupé. UUID: http://zoobank.org/23257d6c-262b-4ef5-ae4e-cc431777e67e
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2021.37