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Exceptionally preserved Mickwitzia from the Indian Springs Lagerstätte (Cambrian Stage 3), Nevada

Published online by Cambridge University Press:  09 May 2016

Aodhán D. Butler
Affiliation:
Department of Earth Science, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden 〈aodhan.butler@geo.uu.se〉 〈michael.streng@geo.uu.se〉 〈lars.holmer@pal.uu.se〉
Michael Streng
Affiliation:
Department of Earth Science, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden 〈aodhan.butler@geo.uu.se〉 〈michael.streng@geo.uu.se〉 〈lars.holmer@pal.uu.se〉
Lars E. Holmer
Affiliation:
Department of Earth Science, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden 〈aodhan.butler@geo.uu.se〉 〈michael.streng@geo.uu.se〉 〈lars.holmer@pal.uu.se〉
Loren E. Babcock
Affiliation:
School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, USA, and Department of Geology, Lund University, Sölvegatan 12, 223 62 Lund, Sweden 〈babcockloren@gmail com〉

Abstract

Exceptionally preserved specimens of the Cambrian stem-group brachiopod Mickwitzia occidens Walcott, 1908 are described in detail from the Indian Springs Lagerstätte in Nevada, USA. Shell structure and preserved mantle setae from these specimens reveal a variable diagenetic (taphonomic) history and provide insight into the phylogenetic position of mickwitziids. Morphologic and morphometric comparison to M. monilifera (Linnarsson, 1869) from Sweden and M. muralensis Walcott, 1913 from British Columbia, Canada reveals clear species-level distinctions. Scanning electron microscopic analysis allows revision of the generic diagnosis. The Mickwitzia shell is characterized by the presence of inwardly pointing phosphatic cones and tangential setae-bearing tubes. The inwardly pointing cone structures are not consistent with setal bearing structures as previously thought, but rather represent endopunctae-like structures. Acrotretid-like shell structures and shell-penetrating setae in M. occidens strengthen the previously proposed close relationship between stem-group brachiopods and tommotiids, a group of small shelly fossils.

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Articles
Copyright
Copyright © 2016, The Paleontological Society 

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