Papers in Palaeontology
Volume 7, Issue 4 p. i
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First published: 13 October 2021
https://doi.org/10.1002/spp2.1406

Graphical Abstract

Cover: Holotype of Archaeocidaris ivanovi from the Carboniferous of Russia (PIN 5348/192). Specimen (including matrix) approx. 87 mm wide. (https://doi.org/10.1002/spp2.1280)

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