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Article: A chitinozoan morphological lineage and its importance in Lower Silurian stratigraphy

Publication: Palaeontology
Volume: 43
Part: 2
Publication Date: June 2000
Page(s): 359 373
Author(s): Gary Lee Mullins
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How to Cite

MULLINS, G. 2000. A chitinozoan morphological lineage and its importance in Lower Silurian stratigraphy. Palaeontology43, 02, 359–373.

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Margachitina margaritana is a distinctive, chain-forming chitinozoan taxon of the uppermost Telychian Stage (Llandovery Series) to lower Homerian Stage (Wenlock Series). M. margaritana is shown to be the end member of a morphological lineage that developed from Calpichitina densa via the intermediate Margachitina banwyensis sp. nov. A local M. banwyensis Biozone, which correlates with the upper lapworthi graptolite Biozone, is proposed for the Banwy River section. The morphological lineage described provides a tool for the enhanced subdivision of the uppermost Llandovery Series, which may prove global in extent. This research suggests also that the base of the Wenlock Series may correlate with a level below the centrifugus graptolite Biozone and it also brings into question the systematic status of Calpichitina and Margachitina, although both genera are retained herein.
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