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Silurian to lower middle Devonian Chonetacea
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Three major groups of Llandoverian to Eifelian chonetids are recognized: the Chonetidae, the Anopliidae, and the Chonostrophiidae as mentioned in this paper.Abstract:
Three major groups of Llandoverian to Eifelian chonetids are recognized: the Chonetidae, the Anopliidae, and the Chonostrophiidae. The relationship of these groups to each other and to the enigmatic genera Notiochonetes and Allanetes are not known. Protochonetes is considered to have given rise to Strophochonetes, Chonetes, Parachonetes, Eccentricosta, Dawsonelloides n.g., and possibly Longispina; Chonetes to have given rise to Eodevonaria and Plebejochonetes n.g.; Plebejochonetes n.g. to Plicodevonaria n.g. Chonostrophia was derived from Chonostrophiella, Shagamella n.g. and Eoplicanoplia n.g. are considered to share a common ancestry, Shagamella n.g. gave rise to Anoplia; Eoplicanoplia n.g. to Plicanoplia n.g. which, in turn, gave rise to Cyrtoniscus n.g. Lower Devonian chonetids are notably provincial in their geographic distribution. Seven new genera are defined: Plebejochonetes n.g. from the lower Devonian and Eifelian of Europe & Turkey; Plicodevonaria n.g. from the lower Devonian and Eifelian of Europe, Turkey, Morocco, and Burma; Dawsonelloides n.g. from the lower Devonian of the northern Appalachians; Shagamella n.g. from the Ludlow of Britain and Venezuela; Eoplicanoplia n.g. from the Ludlow of North America; Plicanoplia n.g. from the lower Devonian of North and South America; and Cyrtoniscus n.g. from the lower Devonian of northeastern North America. The family Anopliidae is revised. The family Eodevonariidae Sokolskaja, is placed in the synonomy of the Chonetinae.read more
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References
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Journal Article
The Silurian Rocks of the Ludlow District, Shropshire
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XXV.—On the Fossils of the Older Deposits in the Rhenish Provinces; preceded by a general Survey of the Fauna of the Palœozoic Rocks, and followed by a Tabular List of the Organic Remains of the Devonian System in Europe.
D’Archiac,M. Edouard De Verneuil +1 more
TL;DR: In this article, the Geological Society of France published a survey of the fossils found in the same beds in France, in Belgium, in the Eifel, and in various parts of Germany.