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

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Exceptionally preserved Mickwitzia from the Indian Springs Lagerstatte (Cambrian Stage 3), Nevada. / Butler, Aodhan D.; Streng, Michael; Holmer, Lars E.; Babcock, Loren E.

In: Journal of Paleontology, Vol. 89, No. 6, 01.11.2015, p. 933-955.

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Butler, Aodhan D. ; Streng, Michael ; Holmer, Lars E. ; Babcock, Loren E. / Exceptionally preserved Mickwitzia from the Indian Springs Lagerstatte (Cambrian Stage 3), Nevada. In: Journal of Paleontology. 2015 ; Vol. 89, No. 6. pp. 933-955.

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TY - JOUR

T1 - Exceptionally preserved Mickwitzia from the Indian Springs Lagerstatte (Cambrian Stage 3), Nevada

AU - Butler, Aodhan D.

AU - Streng, Michael

AU - Holmer, Lars E.

AU - Babcock, Loren E.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Exceptionally preserved specimens of the Cambrian stem-group brachiopod Mickwitzia occidens Walcott, 1908 are described in detail from the Indian Springs Lagerstatte 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.

AB - Exceptionally preserved specimens of the Cambrian stem-group brachiopod Mickwitzia occidens Walcott, 1908 are described in detail from the Indian Springs Lagerstatte 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.

UR - http://www.scopus.com/inward/record.url?scp=84971411269&partnerID=8YFLogxK

U2 - 10.1017/jpa.2016.8

DO - 10.1017/jpa.2016.8

M3 - Article

VL - 89

SP - 933

EP - 955

JO - Journal of Paleontology

T2 - Journal of Paleontology

JF - Journal of Paleontology

SN - 0022-3360

IS - 6

ER -