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

Butler, Aodhan D.; Streng, Michael; Holmer, Lars E. and Babcock, Loren E. LU (2015) In Journal of Paleontology 89(6). p.933-955
Abstract

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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Paleontology
volume
89
issue
6
pages
23 pages
publisher
Paleontological Society
external identifiers
  • scopus:84971411269
ISSN
0022-3360
DOI
10.1017/jpa.2016.8
language
English
LU publication?
yes
id
50c074bf-f2c2-430b-a9b8-fbfda0c0c855
date added to LUP
2016-12-22 11:05:02
date last changed
2017-04-12 15:57:22
@article{50c074bf-f2c2-430b-a9b8-fbfda0c0c855,
  abstract     = {<p>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.</p>},
  author       = {Butler, Aodhan D. and Streng, Michael and Holmer, Lars E. and Babcock, Loren E.},
  issn         = {0022-3360},
  language     = {eng},
  month        = {11},
  number       = {6},
  pages        = {933--955},
  publisher    = {Paleontological Society},
  series       = {Journal of Paleontology},
  title        = {Exceptionally preserved Mickwitzia from the Indian Springs Lagerstatte (Cambrian Stage 3), Nevada},
  url          = {http://dx.doi.org/10.1017/jpa.2016.8},
  volume       = {89},
  year         = {2015},
}