The ecdysozoans are the most diverse animal group on Earth, . Molecular clock studies indicate that the ecdysozoans may have diverged and diversified in the Ediacaran Period, , but unambiguous ecdysozoan fossils first appear in the earliest Cambrian and are limited to cycloneuralians–. Here we report new material of the early Cambrian microscopic animal Saccorhytus coronarius , which was previously interpreted as a deuterostome. Saccorhytus coronarius is reconstructed as a millimetric and ellipsoidal meiobenthic animal with a spinose armor and an anterior mouth but no anus. Purported pharyngeal gills in support of the deuterostome hypothesis are shown to be taphonomic artifacts. Phylogenetic analyses indicate that Saccorhytus coronarius belongs to the total-group Ecdysozoa, highlighting the morphological and ecological diversity of early Cambrian ecdysozoans. ### Competing Interest Statement The authors have declared no competing interest. : #ref-1 : #ref-2 : #ref-3 : #ref-4 : #ref-5 : #ref-7 : #ref-8
- Downloaded 765 times
- Download rankings, all-time:
- Site-wide: 41,885
- In paleontology: 79
- Year to date:
- Site-wide: 25,693
- Since beginning of last month:
- Site-wide: 68,841
Downloads over time
Distribution of downloads per paper, site-wide
- 27 Nov 2020: The website and API now include results pulled from medRxiv as well as bioRxiv.
- 18 Dec 2019: We're pleased to announce PanLingua, a new tool that enables you to search for machine-translated bioRxiv preprints using more than 100 different languages.
- 21 May 2019: PLOS Biology has published a community page about Rxivist.org and its design.
- 10 May 2019: The paper analyzing the Rxivist dataset has been published at eLife.
- 1 Mar 2019: We now have summary statistics about bioRxiv downloads and submissions.
- 8 Feb 2019: Data from Altmetric is now available on the Rxivist details page for every preprint. Look for the "donut" under the download metrics.
- 30 Jan 2019: preLights has featured the Rxivist preprint and written about our findings.
- 22 Jan 2019: Nature just published an article about Rxivist and our data.
- 13 Jan 2019: The Rxivist preprint is live!