Aetiocetus weltoni

Deméré, Thomas A. & Berta, Annalisa, 2008, Skull anatomy of the Oligocene toothed mysticete Aetioceus weltoni (Mammalia; Cetacea): implications for mysticete evolution and functional anatomy, Zoological Journal of the Linnean Society 154 (2), pp. 308-352 : 313

AETIOCETUS WELTONI BARNES & KIMURA, IN BARNES ET AL., 1995

Emended diagnosis: A species of Aetiocetus with deeply concave orbital rim of supraorbital process of frontal and posteriormost edge of ascending process of maxilla terminating at posterior border of supraorbital process of frontal (autapomorphies of A. weltoni ); narrower transverse intertemporal width, more robust zygomatic process of the squamosal, and less lobate anterior parietal wings (symplesiomorphies relative to A. cotylalveus ); non-polydont upper dentition, minor overhang of temporal wall by lambdoidal crests, and narrower nasals (symplesiomorphies relative to A. polydentatus ).

Holotype: UCMP 122900 , including associated elements of one individual consisting of a nearly complete skull (missing most of the supraoccipital), right and left dentaries, partial hyoid skeleton, cervical, thoracic, lumbar and caudal vertebrae, and some ribs. Only the skull and dentaries have been prepared to date.

Locality: UCMP Locality V-79013, Ona Beach, Lincoln County, Oregon, USA .

Stratigraphic horizon and age: Yaquina Formation (upper part); late Oligocene, Chattian, ~24–28 Ma.