The Ordovician trilobite Oenonella and the new family Oenonellidae, with new species from western Newfoundland, Canada

The tiny Ordovician trilobite Oenonella Fortey, 1980 has previously been known only from cranidia and pygidia of its Middle Ordovician type species. Two new species, Oenonella wasisnamei and O. otherfellersorum, from the Darriwilian Table Cove Formation, western Newfoundland, Canada, are known from...

Full description

Saved in:
Bibliographic Details
Published in:Journal of paleontology 2022-09, Vol.96 (5), p.1061-1077
Main Authors: Adrain, Jonathan M., Fortey, Richard A.
Format: Article
Language:English
Subjects:
Amechilus palaora
Arthropoda
Canada
Darriwilian
Eastern Canada
exoskeletons
Fillmore Formation
Fossil animals
invertebrate
lithostratigraphy
Lower Ordovician
Main Brook Newfoundland and Labrador
Marine invertebrates
Middle Ordovician
Millard County Utah
morphology
Museums
New family
New species
new taxa
Newfoundland
Newfoundland and Labrador
Oenonella
Oenonellidae
Ordovician
Paleontology
Paleozoic
Phylogenetics
Phylogeny
REGULAR ARTICLES
Shallow Bay Formation
Stratigraphy
Table Cove Formation
taxonomy
Trilobita
Trilobitomorpha
United States
Utah
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The tiny Ordovician trilobite Oenonella Fortey, 1980 has previously been known only from cranidia and pygidia of its Middle Ordovician type species. Two new species, Oenonella wasisnamei and O. otherfellersorum, from the Darriwilian Table Cove Formation, western Newfoundland, Canada, are known from silicified material that provides new information on the librigena, ventral morphology, and intraspecific variation within the group. The stratigraphic range of the genus is extended downward by an occurrence in the Floian of the Shallow Bay Formation, western Newfoundland. New knowledge of Oenonella confirms its likely phylogenetic relationship with Proscharyia Peng, 1990, known from the Tremadocian of South China. In addition, the overlooked Amechilus Ross, 1951, seems to belong to the same group. Both Oenonella and Proscharyia have in the past been assigned to the aulacopleuride family Scharyiidae Osmólska, 1957. New silicified material effectively rules out this possibility. The broader affinity of the group remains obscure, but together the three genera are assigned to the new family Oenonellidae. UUID:http://zoobank.org/ee3ce7ed-3d9b-4730-a5cb-cf680df418ec
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2022.22