DOI: 10.5061/dryad.f4qrfj74j
title: Supplementary data from: Contrasting macroevolutionary patterns in pelagic tetrapods across the Triassic–Jurassic transition

description: The iconic marine raptorial predators Ichthyosauria and Eosauropterygia
 co-existed in the same ecosystems throughout most of the Mesozoic Era,
 facing similar evolutionary pressures and environmental perturbations.
 Both groups seemingly went through a massive macroevolutionary bottleneck
 across the Triassic–Jurassic (T/J) transition that greatly reduced their
 morphological diversity, leaving pelagic lineages as the only survivors.
 However, analyses of marine reptile disparity across the T/J transition
 have usually employed coarse morphological and temporal data. We
 comprehensively compare the evolution of ichthyosaurian and
 eosauropterygian morphology and body size across the Middle Triassic to
 Early Jurassic interval and find contrasting macroevolutionary patterns.
 The ecomorphospace of eosauropterygians predominantly reflects a strong
 phylogenetic signal, resulting in the clustering of three clades with
 clearly distinct craniodental phenotypes, suggesting ‘leaps’ towards novel
 feeding ecologies. Ichthyosaurian diversification lacks a discernible
 evolutionary trend, as we find evidence for a wide overlap of craniodental
 morphologies between Triassic and Early Jurassic forms. The temporal
 evolution of ecomorphological disparity, fin shape and body size of
 eosauropterygians and ichthyosaurians during the Late Triassic does not
 support the hypothesis of an abrupt macroevolutionary bottleneck near the
 T/J transition. Rather, an important turnover event should be sought
 earlier, during times of rapid sea level falls.
description: # Contrasting macroevolutionary patterns in pelagic tetrapods across the
 Triassic–Jurassic transition supplementary files
 [https://doi.org/10.5061/dryad.f4qrfj74j](https://doi.org/10.5061/dryad.f4qrfj74j","step":2,"step2":"####) **Matrix_Laboury_et_al_2022_modified.nex** * Modified version of the dataset of Laboury et al. (2022) used to create phylogenetic trees for ichthyosaurians. Contains the inclusion of *Cymbospondylus duelferi* (Klein et al. 2020), Cymbospondylus youngorum (Sander et al., 2022), as well as the revised scores of *Cymbospondylus* *petrinus* and *Cymbospondylus nichollsi* from Klein et al. (2020) **Eosauropterygian_analyses.R** * Script to compute all tanglegram, disparity and phenogram analyses concerning eosauropterygians. **Ichthyosaurian_analyses.R** * Script to compute all tanglegram, disparity, phenogram and convergence analyses concerning ichthyosaurians. **Eosauropterygian_datasets.xlsx**. Cells in the whole dataset  for which measurements or traits were not available contain 'NA'. * This dataset contains: * all specimen measurements ('Specimens_measurements_traits' sheet) * Traits specific to each species ('Eosauropterygian_traits' sheet) * Skull and humerus size of each species ('Eosauropterygian_sizes' sheet) * Brachial and crural index of each species ('Brachial_crural_index' sheet) * Height of dorsal vertebrae of Late Triassic and Early Jurassic eosauropterygian specimens ('Eosauropt_dorsal_centra' sheet) * Ages of taxa present eosauropterygian composite phylogenetic tree generated with the dataset of Hu et al. (2024) ('Taxa_ages_Hu_et_al_2024' sheet) of Xu et al. (2022) ('Taxa_ages_Xu_et_al_2022' sheet) respectively for Triassic eosauropterygians. * PCoA scores generated for the craniodental ('Craniodental_PCoA_scores' sheet) and postcranial regions ('Postcranial_PCoA_scores' sheet), as well as for the entire morphological dataset ('Whole_body_PCoA_scores' sheet). - Note: Morphological data for Middle Triassic eosauropterygians have also been published in [https://peerj.com/articles/15776/](https://peerj.com/articles/15776/) **Ichthyosaurian_datasets.xlsx**. Cells in the whole dataset  for which measurements or traits were not available contain 'NA'. * This dataset contains: * all specimen measurements ('Specimens_measurements_traits' sheet) * Traits specific to each species ('Ichthyosaurian_traits' sheet) * Skull and humerus size of each species ('Ichthyosaurian_sizes' sheet) * Brachial and crural index of each species ('Brachial_crural_index' sheet) * Height of dorsal vertebrae of Late Triassic and Early Jurassic ichthyosaurian specimens ('Ichthyosaurian_dorsal_centra' sheet) * Ages of taxa present in the ichthyosaurian phylogenetic tree generated with the modified version of Laboury et al. (2022) ('Phylogenetic_taxa_ages' sheet) * PCoA scores generated for the craniodental ('Craniodental_PCoA_scores' sheet) and postcranial regions ('Postcranial_PCoA_scores' sheet), as well as for the entire morphological dataset ('Whole_body_PCoA_scores' sheet).