DOI: 10.5061/dryad.c866t1gg7
title: Micro-CT data of two early Cambrian cnidarian fossils from China

description: The basal Cambrian Kuanchuanpu Formation (southern Shaanxi,
 China) yields well-preserved specimens of the medusozoan genus
 Olivooides, a thecate polyp exhibiting pentaradial
 symmetry. Described herein is a rare internal thecal (peridermal)
 structure, termed the transverse disc-shaped
 diaphragm (TDD), which consists of a thin, adapically
 convex transverse wall spanning the peridermal cavity in certain specimens
 of O. mirabilis and O. multisulcatus. The TDD
 may be a diagnostic feature distinguishing Olivooides from other
 genera within the family Olivooidae, but it may also have been
 adventitious and thus similar in origin to the schott (apical wall) of
 conulariids, Sphenothallus, and coronate scyphopolyps. If primary
 in nature, the TDD may have served to increase the stability and/or
 feeding efficiency of the polyp within the periderm, and it may have
 provided additional compressional strength the periderm.
 The TDD is the earliest known transverse exoskeletal element in
 cnidarians, though similar transverse structures in tabulate
 corals, conulariids, Sphenothallus, coronate
 scyphopolyps, and Archotuba conoidalis may have arisen
 independently in these lineages.
description: Two samples were scanned using X-ray Tomographic Microscopy
 (Micro-CT; Zeiss Xradia 520 Versa, operating voltage 60kV). Each
 scan produced 2701 projections over 360°, with the data sets having voxel
 dimensions of approximately 1.79 μm (ELISN143-192) and 1.81 μm
 (ELIYoo5-SN-1).
description: # Micro-CT data of two early Cambrian cnidarian fossils from China
 [https://doi.org/10.5061/dryad.c866t1gg7](https://doi.org/10.5061/dryad.c866t1gg7) ## Description of the data and file structure These are Micro-CT data of two samples. These two samples were scanned using X-ray Tomographic Microscopy (Micro-CT; Zeiss Xradia 520 Versa, operating voltage 60kV). Each scan produced 2701 projections over 360°, with the data sets having voxel dimensions of approximately 1.79 μm (ELISN143-192) and 1.81 μm (ELIYoo5-SN-1). Users could build the 3D reconstructions  via VG Studio Max 3.2. ### Files and variables #### File: README.md **Description:**  #### File: ELISN143-192.rar **Description:**  #### File: ELIYoo5-SN-1.rar **Description:**  #### File: description\_of\_RO\_of\_ELIYoo5-SN-1.docx **Description:** This is a text file with a description of the scan settings, voxel settings, techniques used to create images and specimen information of ELIYoo5-SN-1. #### File: description\_of\_RO\_of\_ELISN143-192.docx **Description:** This is a text file with a description of the scan settings, voxel settings, techniques used to create images and specimen information of ELISN143-192. #### File: RO\_of\_ELIYoo5-SN-1.rar **Description:** These are Micro-CT data of Olivooides mirabilis from Early Cambrian. It was scanned using X-ray Tomographic Microscopy (Micro-CT; Zeiss Xradia 520 Versa, operating voltage 60kV). Each scan produced 2701 projections over 360°, with the data set having voxel dimensions of approximately 1.81 μm. #### File: ELIYoo5-SN-1.stl **Description:** This is a 3D reconstruction of the STL format file of ELIYoo5-SN-1. #### File: RO\_of\_ELISN143-192.rar **Description:** These are Micro-CT data of Olivooides mirabilis from Early Cambrian. It was scanned using X-ray Tomographic Microscopy (Micro-CT; Zeiss Xradia 520 Versa, operating voltage 60kV). Each scan produced 2701 projections over 360°, with the data set having voxel dimensions of approximately 1.79 μm. #### File: ELISN143-192.stl **Description:** This is a 3D reconstruction of the STL format file of ELISN143-192. ## Code/software Users could use VG Studio Max 3.2 to view my data. They could observe the 3D reconstructions of these samples via image stack in this software.