Killer sperm whale: a new basal physeteroid (Mammalia, Cetacea) from the Late Miocene of Italy Zygophyseter varolai , a new genus and species of Physeteroidea (Cetacea, Odontoceti), is based on an almost complete skeleton from the Late Miocene (Torto... G Bianucci,W Landini - 《Zoologica...