The anatomy and phylogenetic affinities of Cynthiacetus peruvianus, a large Dorudon-like basilosaurid (Cetacea, Mammalia) from the late Eocene of Peru Author Martínez-Cáceres, Manuel Author Lambert, Olivier Author Muizon, Christian de text Geodiversitas 2017 2017-03-31 39 1 7 163 http://dx.doi.org/10.5252/g2017n1a1 journal article 10.5252/g2017n1a1 1638-9395 4535622 urn:lsid:zoobank.org:pub:40D6C996-226D-49BF-8BF2-E07050BE9035 Cynthiacetus maxwelli Uhen, 2005 Zeuglodon cf. brachyspondylus – Müller 1849: 26-28 . — Kellogg 1936: 248 (in part). HOLOTYPE . — MMNS VP 445. It includes a partially preserved skull, dentaries, upper and lower dentitions, petro-tympanic complex, humerus, radius, ulna, cervical, thoracic and lumbar vertebrae. TYPE LOCALITY. — Cynthia Clay Pit, Hinds County , Mississippi , USA . TYPE HORIZON. — Yazoo Clay Formation, Priabonian, late Eocene. EMENDED DIAGNOSIS. — Cynthiacetus maxwelli differs mainly from C. peruvianus in having one more cusp on both mesial and distal edges on p3 and p4 (5 and 6 denticles respectively in p3 and p4). It also possesses a longer and lower dome-shaped neural arch on the atlas and shorter and more massive humerus, radius and ulna (cf. below).