Vascular structure of the earliest shark teeth

Carlos Martinez-Perez, Alba Martin-Lazaro, Humberto G. Ferron, Martina Kirstein, Philip C.J. Donoghue & Hector Botella

This dataset contains three dimensional synchrotron x-ray tomographic (SRXTM) datasets and analyses of the two oldest tooth-bearing shark species known, Leonodus carlsi and Celtiberina maderi, from the Lower Devonian of Spain.

The data accompanies the following paper: Carlos Martinez-Perez, Alba Martin-Lazaro, Humberto G. Ferron, Martina Kirstein, Philip C.J. Donoghue & Hector Botella. Vascular structure of the earliest shark teeth. Acta Geologica Polonia. DOI: dx.doi.org/XXXX

Each .7z archive zip file contains the data relating to a single specimen.

The specimens analysed, their museum number and the deposited files related to them are as follows:	

	File name	Specimen name		Museum number*	Files

01	Celtiberina	Celtiberina maderi	MGUV-21.315 	Tomographic data, segmentation data.
02	Leonodus	Leonodus carlsi		MGUV-36.141		Tomographic data, segmentation data.

*Institutional abbreviations: MGUV refers to the Geological Museum of the University of Valencia, Valencia, Spain.

All Specimens were scanned using synchrotron radiation X-ray tomographic microscopy (SRXTM) at the X02DA TOMCAT beamline at the Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland.

Raw tomographic data for each specimen consists of a stacked series of 2D .tif files that represent maps of X-ray attenuation. The individual slices can be viewed with standard graphics software. The datasets can be studied in 3D using tomographic reconstruction software such as Avizo (www.vsg3d.com/), Spiers (www.spiers-software.org/), VG Studio Max (www.volumegraphics.com) etc.

Working files consist of Avizo files (.hx and .am files, which can be opened in Avizo (www.vsg3d.com/)). Avizo project files containing segmentation of the models might not be attached to the tomographic tiff data and an error might occur. If that happens, click on "ignore all errors" and re-attach the tomographic data manually using the voxel size provided. The Avizo models were developed from a second stacked series of 2D resample and/or cropped tif files used for segmentation that are also included for each specimen (check voxel sizes of the data in the .info file).

VOXEL SIZES:

Original Voxel size for Celtiberina specimen is 1.625 x 1.625 x 1.625 micrometers.

Original Voxel size for Leonodus specimen is 3.25 x 3.25 x 3.25 micrometers.

Synchrotron settings for the specimens scanned at the Swiss Light Source in February 2014 are as follows:

	Original File name	Specimen name		Museum number	energy	projections	exposure	objective 	scintillator

01	Celti_1			Celtiberina maderi 	MGUV-21.315	23 KeV	1501		300 ms		4x		LAG:Ce-100 micrometers
02	Leonodus_		Leonodus carlsi		MGUV-36.141	24 KeV	1501		300 ms		2x		LAG:Ce-20 micrometers