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dc.contributor.authorZamora, Samuel
dc.contributor.authorRahman, Imran
dc.contributor.authorSumrall, Colin D
dc.contributor.authorGibson, Adam P
dc.contributor.authorThompson, Jeffrey R
dc.date.accessioned2022-03-18T14:22:59Z
dc.date.available2022-03-18T14:22:59Z
dc.date.issued2022-03-09
dc.date.submitted2021-12-17
dc.identifier.citationZamora Samuel, Rahman Imran A., Sumrall Colin D., Gibson Adam P. and Thompson Jeffrey R. 2022Cambrian edrioasteroid reveals new mechanism for secondary reduction of the skeleton in echinodermsProc. R. Soc. B.2892021273320212733 http://doi.org/10.1098/rspb.2021.2733en_US
dc.identifier.issn0962-8452
dc.identifier.doi10.1098/rspb.2021.2733
dc.identifier.urihttp://hdl.handle.net/10141/622971
dc.description.abstractEchinoderms are characterized by a distinctive high-magnesium calcite endoskeleton as adults, but elements of this have been drastically reduced in some groups. Herein, we describe a new pentaradial echinoderm, Yorkicystis haefneri n. gen. n. sp., which provides, to our knowledge, the oldest evidence of secondary non-mineralization of the echinoderm skeleton. This material was collected from the Cambrian Kinzers Formation in York (Pennsylvania, USA) and is dated as ca 510 Ma. Detailed morphological observations demonstrate that the ambulacra (i.e. axial region) are composed of flooring and cover plates, but the rest of the body (i.e. extraxial region) is preserved as a dark film and lacks any evidence of skeletal plating. Moreover, X-ray fluorescence analysis reveals that the axial region is elevated in iron. Based on our morphological and chemical data and on taphonomic comparisons with other fossils from the Kinzers Formation, we infer that the axial region was originally calcified, while the extraxial region was non-mineralized. Phylogenetic analyses recover Yorkicystis as an edrioasteroid, indicating that this partial absence of skeleton resulted from a secondary reduction. We hypothesize that skeletal reduction resulted from lack of expression of the skeletogenic gene regulatory network in the extraxial body wall during development. Secondary reduction of the skeleton in Yorkicystis might have allowed for greater flexibility of the body wall.en_US
dc.language.isoenen_US
dc.publisherThe Royal Societyen_US
dc.rightsopenAccessen_US
dc.titleCambrian edrioasteroid reveals new mechanism for secondary reduction of the skeleton in echinodermsen_US
dc.typeJournal Articleen_US
dc.identifier.eissn1471-2954
dc.identifier.journalProceedings of the Royal Society B: Biological Sciencesen_US
dc.date.updated2022-03-02T16:49:35Z
dc.identifier.volume289en_US
dc.identifier.issue1970en_US
elements.import.authorZamora, Samuel
elements.import.authorRahman, Imran A
elements.import.authorSumrall, Colin D
elements.import.authorGibson, Adam P
elements.import.authorThompson, Jeffrey R
dc.description.nhmCopyright © 2021, The Authors. This document is the author’s final accepted version of the journal article. You are advised to consult the published version if you wish to cite from it.en_US
dc.subject.nhmCambrianen_US
dc.subject.nhmechinodermsen_US
dc.subject.nhmskeletonen_US
dc.subject.nhmevolutionen_US
dc.subject.nhmdevelopmenten_US
refterms.dateFOA2022-03-18T14:23:00Z


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