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Taxonomy
Acrophyseter deinodon was named by Lambert et al. (2008). Its type specimen is MNHN SAS 1626, a skull, and it is a 3D body fossil. Its type locality is Sud Sacaco, Montemar, which is in a Messinian paralic siltstone in the Pisco Formation of Peru. It is the type species of Acrophyseter.
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Acrophyseter deinodon Lambert et al. |
| 2015 | Acrophyseter deinodon Velez-Juarbe et al. p. 15 figs. Fig. 10 |
| 2017 | Acrophyseter deinodon Lambert et al. p. 406 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Acrophyseter deinodon Lambert et al. 2008
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Lambert et al. 2017 | Small physeteroid with an upper tooth count of 12, differing from all other members of the superfamily in the following characters: dorsal surface of premaxillae steeply sloping dorsomedially along rostrum; deep and rectilinear groove directed anterolaterally along medial wall of tympanosquamosal recess; conspicuously curved mandible with regularly convex ventral margin in lateral view; considerably enlarged right infraorbital canal, with a transverse diameter > 7% of bizygomatic width; long and greatly thickened medial lamina of the pterygoid along the basioccipital basin. Further differs
from all other physeteroids except Zygophyseter varolai Bianucci & Landini, 2006 in having a more developed supracranial basin on right side of neurocranium, this basin partly overhanging right orbit and from all other physeteroids except Brygmophyseter shigensis Kimura et al., 2006, Livyatan and Zygophyseter in having dental roots whose greatest diameter exceeds 5% of the maximum skull width. Acrophyseter is further characterized by the following, probably plesiomorphic, features: retention of enamel on teeth; posterior lower teeth transversely flattened; posterior end of upper alveolar groove close to level of antorbital notch; retention of two nasals; elongated contact between jugal and zygomatic process of squamosal; and a high and anteroposteriorly long temporal fossa. |