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. 2021 May 11;11:10021. doi: 10.1038/s41598-021-89472-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Stillatuberoolithus storrsi oogen. et oosp. nov. partial eggs and eggshell. (a) Partial egg (DMNH EPV.65736). Dotted circle indicates estimated spherical egg size based upon curvature (b) Partial egg (DMNH EPV.128286, paratype). Note circular dispersituberculate nodes visible in apex view (top left) and slightly elongated nodes with long axes aligned visible in lateral view (top right). Dotted circle indicates estimated spherical egg size based upon curvature. Blue dotted line indicates potential ellipsoidal egg size (profile is based upon laevisoolithid eggs); (c) Eggshell fragments (left to right, UCM 1039A, DMNH EPV.65602 holotype, UCM 1139 paratype, UCM 1083) displaying variation in ornamentation grading from circular to oval-shaped, flattened nodes that taper in cross section; (d) Node profiles grading from circular (left) to oval-shaped (right).