MorphSim v1.2.0 First release accompanying the publication: Mulvey et al. (2026) "MorphSim: An R package for simulating discrete morphological data" MorphSim is an R package for simulating discrete morphological character data for total-evidence and tip-dated phylogenetic analyses. Key Features Evolutionary models Mk model and extensions (MkV, ordered variants) Among-character rate variation (ACRV) via gamma or lognormal distributions User-defined custom rate matrices Multi-partition schemes with different states per partition Fossil & ancestor support Simulates character data for sampled ancestors (direct ancestral fossils) Integrates with FossilSim, TreeSim, and SimClock for a complete end-to-end pipeline compatible with RevBayes and BEAST2 Realistic missing data Structured missing data by anatomical partition with taphonomic decay probabilities Missing data by rate category, taxon age, or random removal Visualisation & summary statistics Plot trait evolution history across the full and reconstructed tree Consistency and retention indices Convergent evolution tracking across all characters Export write.morpho() exports trees, matrices, and fossil ages in formats compatible with RevBayes and BEAST2 MorphSimShiny An interactive Shiny app for exploring model assumptions and simulating datasets without requiring R expertise. https://github.com/fossilsim/morphsimshiny Installation install.packages("MorphSim") or from GitHub: devtools::install_github("fossilsim/morphsim")