Data from: Molecular palaeontology illuminates the evolution of ecdysozoan vision

Colour vision is known to have arisen only twice – once in Vertebrata and once within the Ecdysozoa, in Arthropoda. However, the evolutionary history of ecdysozoan vision is unclear. At the molecular level, visual pigments, composed of a chromophore and a protein belonging to the opsin family, have different spectral sensitivities and these mediate colour vision. At the morphological level, ecdysozoan vision is conveyed by eyes of variable levels of complexity; from the simple ocelli observed in the velvet worms (phylum Onychophora) to the marvellously complex eyes of insects, spiders and crustaceans. Here we explore the evolution of ecdysozoan vision at both the molecular and morphological level; combining analysis of a large-scale opsin dataset that includes previously-unknown ecdysozoan opsins with morphological analyses of key Cambrian fossils with preserved eye structures. We found that while several non-arthropod ecdysozoan lineages have multiple opsins, arthropod multi-opsin vision evolved through a series of gene duplications were fixed in a period of 35 to 71 Million years (Ma) along the stem-arthropod lineage. Our integrative study of the fossil and molecular record of vision indicates that fossils with more complex eyes were likely to have possessed a larger complement of opsin genes.

RevBayes Analyses
This folder contains data scripts and results of our RevBayes analyses
RevBayesAnalysis_Oct2018.zip
ALE analyses
This include data scripts and results of ALE analyses
ALE.tar.gz
Analyses of Prank Aligned Sequences
This fine include the data scripts and results of the analyses we performed on a PRANK aligned dataset
PRANKPrelim.tar.gz
Preliminary Analyses of MUSCLE aligned sequences
This include the preliminary alignment generated with MUSCLE and results of analyses obtained from its phylogenetic analyses
MUSCLEPrelim.tar.gz
Muscle Aligned Sequences Final Analyses
This is the final alignment we generated plus results of its analyses.
MUSCLEFinalAnalysis.tar.gz
Opsin Divergence times
Relaxed (CIR) Molecular clock analyses of the Opsin final MUSCLE alignment
MolecularClockPB.tar.gz

Fleming, James F.; Kristensen, Reinhardt M.; Sørensen, Martin V. et al. (2018). Data from: Molecular palaeontology illuminates the evolution of ecdysozoan vision [Dataset]. Dryad. https://doi.org/10.5061/dryad.ts895r1