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The Upper Tremadocian (Ordovician) Graptolite Bryograptus: taxonomy, biostratigraphy and biogeography

The Upper Tremadocian (Ordovician) Graptolite Bryograptus: taxonomy, biostratigraphy and biogeography

Authors :
Maletz, Jörg
Egenhoff, Sven
Alonso, Ricardo Narciso
Publication Year :
2010
Publisher :
The Paleontological Association, 2010.

Abstract

The taxonomy, biostratigraphical and palaeogeographical distribution of the Lower Ordovician graptolite genus Bryograptus is evaluated. Bryograptus is recognized as a distinct triradiate anisograptid with a multiramous, pendent rhabdosome. The species of the genus Bryograptus can be interpreted as shallow water faunal elements with a strongly limited biogeographical distribution to the Atlantic Faunal Realm. Bryograptus is restricted to a narrow interval in the Upper Tremadocian, the Bryograptus Biozone of Scandinavia and South America (Argentina), making it a taxon with a high potential for precise biostratigraphical correlations. The proximal end development can be used to differentiate the genus Bryograptus from other pendent multiramous graptoloid genera with a homoplastic rhabdosome development. Characteristics of the proximal end development and structure easily differentiate these genera in relief specimens, but not in flattened material. Fil: Maletz, Jörg. Saint Francis Xavier University; Canadá Fil: Egenhoff, Sven. State University Of Colorado - Fort Collins; Estados Unidos Fil: Alonso, Ricardo Narciso. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.od......3498..952138d8466f06aaa2337fe43c830a8a
Full Text :
https://doi.org/10.1111/j.1475-4983.2009.00920.x/abstract