Supplementary tables with cetacean mitogenomes dataset analysis, extracted from NCBI's Nucleotide database and Bold Systems, last accessed on 4th of July 2025 (Afonso et al): Table S1 - Full analysed dataset extracted from NCBI Nucleotide database (4th of July 2025) with accession numbers, presence or absence (TRUE/FALSE) of each target markers, journal, taxa information and geographical metadata extracted from the records. Table S2 - Number of total and target marker (12S, 16S, COI, Cytb and D-loop) sequences at species level, from the extracted dataset from the NCBI Nucleotide database (accesse on July 4, 2025). NCBI taxonomy correspond to species/subspecies associated to at least one unique accession, while SMM Taxonomy indicates its currently accepted taxonomic cassification (Society of Marine Mammalogy, 2025). Table S3 - Full analysed COI/COI-5P dataset extracted from Barcode of Life Database Systems (BOLD; 4th of July 2025) with processid, sampleid, recordID, bin, taxa information, geographical metadata and GenBank related information. Table S4 - Number of studies and marker sequences for each of the formed geographical clusters, of sequences extracted from NCBI Nucleotide database (4th of July 2025). Only records with geographical information available. Table S5 - Number of records per cetacean family in each of the formed geographical clusters, extracted from NCBI Nucleotide database (4th of July 2025). Only records with geographical information available. Reference: Afonso, L., Lagrotteria, A., Lavrador, A. S., Suarez-Bregua, P., Álvarez-González, M., Valente, R., Jensen, M. R., Saavedra, C., Morais, D. K., Pierce, G., Magalhães, C., & Correia, A. M. (2025). Navigating the mitochondrial genome landscape of cetaceans: Identifying data coverage and deficiencies in public repositories (Submitted for publication).