Prepare Data and Trees for Phylogenetic Comparative Methods R package prepR4pcm version 1.0.0 Reconcile species names across datasets and phylogenetic trees for comparative biology workflows. Identifies mismatches due to formatting differences, taxonomic synonymy, and spelling errors. Produces detailed reports documenting how each name was resolved, which taxonomic authority was used, and what remains unresolved. Supports exact matching, name normalisation, synonym resolution via local taxonomic databases, and fuzzy matching for likely typos. Detects taxonomic splits and lumps. For methodological context, see Nakagawa et al. (2026) <doi:10.32942/X2468Z>. Software Depends: R (>= 4.1.0) Imports: ape, cli, rlang, tibble Suggests: caper, clootl, digest, dplyr, fishtree, httr2, knitr, MCMCglmm, phytools, piggyback, pkgdown, readr, rgnparser, rmarkdown, rotl, rtrees, spelling, stringr, taxadb, testthat (>= 3.0.0) Shinichi Nakagawa <itchyshin@gmail.com> Comprehensive R Archive Network (CRAN) Shinichi Nakagawa [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-7765-5182>), Santiago Ortega [aut], Ayumi Mizuno [aut], Eduardo S.A. Santos [aut], Malgorzata Lagisz [aut] (ORCID: <https://orcid.org/0000-0002-3993-6127>), Bhavya Jain [aut], Jimuel Jr Celeste [aut], Sergio Poo Hernandez [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=prepR4pcm/LICENSE) 2026-06-25 application/tgz https://CRAN.R-project.org/package=prepR4pcm doi:10.32614/CRAN.package.prepR4pcm en-GB