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7 September 2022 Revision of Histiodella labiosa Bauer, 2010, and its inferred phylogeny in the evolution of the Middle Ordovician conodont genus Histiodella Harris, 1962
Yong Yi Zhen, Jeffrey A. Bauer, Stig M. Bergström
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Abstract

Based on abundant topotype specimens from the Oil Creek Formation at the type locality in southern Oklahoma, Histiodella labiosa is described and revised. The morphological variation of the Pa, Pb, and M elements of this previously little-known species is also systematically documented and illustrated. The revised species definition, with formal designation of a lectotype and a new diagnosis supported by morphological comparison with its ancestral and descendent species, has enhanced its value for correlation of the lower Darriwilian. The inferred phylogeny of Histiodella that resulted from this study is based on both cladistic and morphological analyses. It supports the monophyletic grouping of Histiodella species and their evolutionary relationships. This has wide biostratigraphic implications because many Histiodella species are valuable for detailed global correlation of upper Dapingian to middle Darriwilian strata.

Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Paleontological Society
Yong Yi Zhen, Jeffrey A. Bauer, and Stig M. Bergström "Revision of Histiodella labiosa Bauer, 2010, and its inferred phylogeny in the evolution of the Middle Ordovician conodont genus Histiodella Harris, 1962," Journal of Paleontology 96(5), 1149-1165, (7 September 2022). https://doi.org/10.1017/jpa.2022.26
Accepted: 19 March 2022; Published: 7 September 2022
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