Diagnostic features of the skull and mandible
On the vertex of the dorsal skull the premaxillary bone extends forward of the nasal and frontal. Separates from Berardius and Ziphius.
A sulcus (groove) running along the middle of the combined surfaces of the nasal bones so depresses their middle that it is the lateral portion of each nasal bone that reaches farthest forward on the vertex. Separates from Tasmacetus and Indopacetus.
When the skull is upright and the long axis of the anterior half of the beak is horizontal, a horizontal plane transecting the summit of either maxillary prominence transects the mesethmoid bone. Separates from Hyperoodon.
Tooth alveoli of mandible are posterior to the mandibular symphysis. Separates from Berardius, Ziphius, Tasmacetus, Indopacetus, Hyperoodon, M. bidens, M. bowdoini, M. carlhubbsi, M. europaeus, M. grayi, M. hectori, M. layardi, M. mirus, M. perrini, and M. traversii.
On the vertex the right premaxilla extends posteriorly beyond the right nasal a distance exceeding 70% of dorsal length of right nasal. Separates from M. ginkgodens.
Antorbital notches form obtuse angles. Separates from M. peruvianus.
A transverse plane perpendicular to the long axis of the rostrum and transecting the apex of the left antorbital notch, the anterior most point reached by the pterygoid sinus is 35+ mm anterior to this plane. Separates from M. stejnegeri.
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