Tanaka, Yoshihiro Furusawa, Hitoshi Kimura, Masaichi Supplementary 6 from A new member of fossil balaenid (Mysticeti, Cetacea) from the early Pliocene of Hokkaido, Japan Tree file Balaenidae;new genus and species;Zanclean;Balaenula balaenopsis;supramastoid crest 2020-04-13
    https://rs.figshare.com/articles/dataset/Supplementary_6_from_A_new_member_of_fossil_balaenid_Mysticeti_Cetacea_from_the_early_Pliocene_of_Hokkaido_Japan/12117369
10.6084/m9.figshare.12117369.v1