Journal Article

PUBDB-2022-07516

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ediacaran Corumbella has a cataphract calcareous skeleton with controlled biomineralization

Osés, G. L. ; Wood, R. ; Romero, G. R. ; Evangelista Martins Prado, G. M. ; Bidola, P. M.Extern*HZG* ; Herzen, J.Extern* ; Pfeiffer, F.Extern* ; Stampar, S. N. ; Alves Forancelli Pacheco, M. L. (Corresponding author)Extern*

2022
Elsevier St. Louis

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Please use a persistent id in citations: doi:10.1016/j.isci.2022.105676  doi:10.3204/PUBDB-2022-07516

Abstract: Summary:Corumbella is a terminal Ediacaran tubular, benthic fossil of debated morphology, composition, and biological affinity. Here, we show that Corumbella had a biomineralized skeleton, with a bilayered construction of imbricated calcareous plates and rings (sclerites) yielding a cataphract organization, that enhanced flexibility. Each sclerite likely possessed a laminar microfabric with consistent crystallographic orientation, within an organic matrix. Original aragonitic mineralogy is supported by relict aragonite and elevated Sr (mean = ca. 11,800 ppm in central parts of sclerites). In sum, the presence of a polarisation axis, sclerites with a laminar microfabric, and a cataphract skeletal organization reminiscent of early Cambrian taxa, are all consistent with, but not necessarily indicative of, a bilaterian affinity. A cataphract skeleton with an inferred complex microstructure confirms the presence of controlled biomineralization in metazoans by the terminal Ediacaran, and offers insights into the evolution of development and ecology at the root of the ‘Cambrian radiation’.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Experiment(s):

1. DORIS Beamline BW2 (DORIS III)

Appears in the scientific report 2022

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