Supplementary material of the manuscript Rita et al., Mechanisms and drivers of belemnite body-size dynamics across the Pliensbachian-Toarcian crisis, submited to Open Science Royal Society. Set of .ply files of CT scans of belemnite rostra. The first 27 files correspond to bed P925; the next 5 files correspond to P949; the next 18 correspond to P961; the next 5 correspond to P976; the next 38 specimens correspond to bed P982 and the last 35 files correspond to bed P984. The number of each file is the specimen number, as listed in the supplementary material of the article. For details on the scanning details or on the age of the specimens, please see the supplementary material of the article. The supplementary figures ("supplementary figures_ESM8.docx" file) and tables ("supplementary tables.xlsx" file) and the R script used for the statistical analysis ("supplement_rscript.docx" file) are also provided. For more details contact patricia.rita@fau.de.