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Taxonomy
Perditicetus was named by Nelson and Uhen (2020). Its type is Perditicetus yaconensis.
It was assigned to Platanistoidea by Nelson and Uhen (2020).
It was assigned to Platanistoidea by Nelson and Uhen (2020).
Species
P. yaconensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Perditicetus Nelson and Uhen |
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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.
G. †Perditicetus Nelson and Uhen 2020
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†Perditicetus yaconensis Nelson and Uhen 2020
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. D. Nelson and M. D. Uhen 2020 | Perditicetus yaconensis is a small odontocete with a long rostrum, comprising greater than 55% of the skull length. The skull is slightly asymmetrical; alveoli preserved on the maxilla indicate a homodont polydont dentition. It is placed in the Platanistoidea based on the following synapomorphies in our phylogenetic analysis: emargination of the posterior edge of zygomatic process by fossa for neck musculature, the presence of a for- amen spinosum, a posterior portion of the periotic fossa, a lateral groove or depression of the periotic, a parabullary sulcus, and an articular rim of the periotic (Boersma et al. 2017). Perditicetus yaconensis differs from the Allodelphinidae, the Squalodelphinidae, and the Platanistidae in the vertex being roughly in the sagittal plane, possessing a reduced lateral lamina that does not contact the falciform process of the squamosal, in the premaxillary foramen situated posterior to the antorbital notch, and in the separation of the zygomatic process of the squamosal from the postorbital process of the frontal, and in the anterior projection of the nasal giving the external nares a heart-shaped appearance. Perditicetus yaconensis further differs from the Allodelphinidae in lacking a deep lateral groove along the rostrum, in the constriction of the mesorostral canal being at the level of the premaxillary sac fossa, in the blunt, rounded postglenoid process, and in the dorsal edge of the temporal fossa being level with the vertex. Perditicetus yaconensis differs from the Squalodelphinidae and the Platanistidae in lacking an supraorbital thickening or crest; lacking a ‘V’-shaped left antorbital notch; in the dorsal surface of the antorbital process being level with the rostrum base; nasal partly overhanging the external nares; posterior dorsal infraorbital foramen located lateral to the premaxillary sac fossa; absence of an orbital fossa for the pterygoid sinus, reduced lateral lamina of the pterygoid; and in possessing a circular profile to the pars cochlearis in ventral view. It further differs from the Platanistidae in lacking a lateral groove between the premaxilla and the maxilla. Thus, Perditicetus is distinguished by its lack of synapomorphies with other platanistoid families. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Chattian to the top of the Aquitanian or 27.30000 to 20.45000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chattian - Aquitanian | USA (Oregon) | P. yaconensis (200294) |