Middle Ordovician (middle Darriwilian) Archaeospicularia and Entactinaria (radiolarians) from the Table Cove Formation, Piccadilly Quarry, Newfoundland, Canada

New, distinctive, well-preserved and previously undescribed constituents of a Middle Ordovician (middle Darriwilian, Dw2) radiolarian assemblage from the Table Cove Formation in Newfoundland are described. Three-dimensional X-ray micro-computed tomography (µ-CT) facilitates detailed examination of k...

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Bibliographic Details
Published in:Journal of paleontology 2021-09, Vol.95 (5), p.913-943
Main Authors: Kachovich, Sarah, Aitchison, Jonathan C.
Format: Article
Language:English
Subjects:
Archaeospicularia
Aspiculum irregulare
Canada
Computed tomography
computed tomography data
Darriwilian
Eastern Canada
electron microscopy data
Entactinaria
faunal list
faunal studies
Fossils
invertebrate
lithostratigraphy
microfossils
Middle Ordovician
Morphology
Neopalaeospiculum piccadilliensis
New species
new taxa
Newfoundland
Newfoundland and Labrador
Nyfrieslandia ramosissima
Ordovician
Paleontology
Paleozoic
Piccadilly Quarry
Port au Port Peninsula
Ports
Quarries
Radiolaria
Ramuspiculum laxum
REGULAR ARTICLES
SEM data
Spongentactinia nazarovi
Stratigraphy
Table Cove Formation
Taxonomy
three-dimensional models
Tomography
Westernbrookia polygonata
X-ray data
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Description
Summary:New, distinctive, well-preserved and previously undescribed constituents of a Middle Ordovician (middle Darriwilian, Dw2) radiolarian assemblage from the Table Cove Formation in Newfoundland are described. Three-dimensional X-ray micro-computed tomography (µ-CT) facilitates detailed examination of key specimens revealing hitherto unknown details of the internal morphologies of key lower Paleozoic taxonomic groups, among which a lack of knowledge has previously impeded resolution of higher taxonomic rankings. Twenty-seven archaeospiculid and entactinarian taxa are described and illustrated including six new species: Westernbrookia polygonata n. sp., Neopalaeospiculum piccadilliensis n. sp., Ramuspiculum laxum n. sp. Spongentactinia nazarovi n. sp., Aspiculum irregulare n. sp., and Nyfrieslandia ramosissima n. sp. The investigation extends the known ranges of the species: Pararcheoentactinia reedaeWon and Iams, 2002; Sphaeroentactinia robustaWon and Iams, 2015; Varispiculum ectospiculatumWon and Iams, 2015; and Svalbardospiculum multifurcatum (Won, Iams, and Reed, 2005), together with the genus Echidnina to the mid-Darriwilian.
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2021.18