Journal article
The brachymetopid trilobite Radnoria in the Silurian (Wenlock) of New York State and Arctic Canada
Canadian journal of earth sciences, Vol.42(12), pp.2087-2096
12/2005
DOI: 10.1139/e05-085
Abstract
Radnoria bretti n. sp., from the Wenlock (Sheinwoodian) Rochester Formation of western New York State, is the best preserved and most completely known member of its genus. It provides the first definitive information on Radnoria's hourglass-shaped rostral plate, the first known hypostome of a Silurian member of the genus, demonstrates that Radnoria engaged in sphaeroidal enrollment, and reveals that early holaspid individuals had tubercles on the posterior thoracic axes and pygidial axial rings that were effaced with maturity. Three new species from the Wenlock of the Cape Phillips Formation of Nunavut are known from sparse material and are reported in open nomenclature. Together, the species greatly increase knowledge of Laurentian Silurian brachymetopids, which have until now been known from a single cranidium from the Wenlock of Arkansas.
Details
- Title: Subtitle
- The brachymetopid trilobite Radnoria in the Silurian (Wenlock) of New York State and Arctic Canada
- Creators
- Jonathan M Adrain - University of IowaDenis K Tetreault - University of Windsor
- Resource Type
- Journal article
- Publication Details
- Canadian journal of earth sciences, Vol.42(12), pp.2087-2096
- Publisher
- National Research Council of Canada
- DOI
- 10.1139/e05-085
- ISSN
- 0008-4077
- eISSN
- 1480-3313
- Language
- English; French
- Date published
- 12/2005
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229170402771
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