Cambrian edrioasteroid reveals new mechanism for secondary reduction of the skeleton in echinoderms
dc.contributor.author | Zamora, Samuel | |
dc.contributor.author | Rahman, Imran | |
dc.contributor.author | Sumrall, Colin D | |
dc.contributor.author | Gibson, Adam P | |
dc.contributor.author | Thompson, Jeffrey R | |
dc.date.accessioned | 2022-03-18T14:22:59Z | |
dc.date.available | 2022-03-18T14:22:59Z | |
dc.date.issued | 2022-03-09 | |
dc.date.submitted | 2021-12-17 | |
dc.identifier.citation | Zamora 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.2021.2733 | en_US |
dc.identifier.issn | 0962-8452 | |
dc.identifier.doi | 10.1098/rspb.2021.2733 | |
dc.identifier.uri | http://hdl.handle.net/10141/622971 | |
dc.description.abstract | Echinoderms 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.iso | en | en_US |
dc.publisher | The Royal Society | en_US |
dc.rights | openAccess | en_US |
dc.title | Cambrian edrioasteroid reveals new mechanism for secondary reduction of the skeleton in echinoderms | en_US |
dc.type | Journal Article | en_US |
dc.identifier.eissn | 1471-2954 | |
dc.identifier.journal | Proceedings of the Royal Society B: Biological Sciences | en_US |
dc.date.updated | 2022-03-02T16:49:35Z | |
dc.identifier.volume | 289 | en_US |
dc.identifier.issue | 1970 | en_US |
elements.import.author | Zamora, Samuel | |
elements.import.author | Rahman, Imran A | |
elements.import.author | Sumrall, Colin D | |
elements.import.author | Gibson, Adam P | |
elements.import.author | Thompson, Jeffrey R | |
dc.description.nhm | Copyright © 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.nhm | Cambrian | en_US |
dc.subject.nhm | echinoderms | en_US |
dc.subject.nhm | skeleton | en_US |
dc.subject.nhm | evolution | en_US |
dc.subject.nhm | development | en_US |
refterms.dateFOA | 2022-03-18T14:23:00Z |