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Chilcacetus ullujayensis
Taxonomy
Chilcacetus ullujayensis was named by Lambert et al. (2025) [this specimen has been previously attributed to Chilcacetus cavirhinus , in a paper including a field photo of the specimen, as well as photos of one rib and the humerus (Bianucci et al. 2018: figs 8, 13)]. Its type specimen is MUSM 2527, a partial skeleton (nearly complete cranium including the two in situ periotics, the detached left malleus, left tympanic bulla, and several teeth, the posterior part of mandibles,), and it is a 3D body fossil. Its type locality is Ullujaya, Chilcatay Formation, which is in a Burdigalian marine siltstone/sandstone in the Chilcatay Formation of Peru.
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Chilcacetus ullujayensis Lambert et al. p. 377 figs. Figs 5-15 |
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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.
†Chilcacetus ullujayensis Lambert et al. 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Lambert et al. 2025 | Chilcacetus ullujayensis n. sp. differs from Chilcacetus
cavirhinus in its slightly greater size (bizygomatic width > 270 mm); the rostrum being proportionally longer (ratio between rostrum length and condylobasal length > 0.71 and ratio between preorbital width and rostrum length < 0.4); 37-39 maxillary teeth per side; the mesorostral groove being dorsally open for a longer distance (dorsomedial contact between premaxillae absent to very short); the vertex of the cranium being proportionally anteroposteriorly shorter and wider; the occipital shield being transversely narrower (minimum posterior distance between temporal fossae approximates maximum width of premaxillae in facial region); the long axis of the zygomatic process of the squamosal being farther to the horizontal plane; and the lower number of alveoli (8) in the post-symphyseal region of the mandible. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: Burdigalian or 20.45000 to 15.98000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | Peru | Chilcacetus ullujayensis (type locality: 167732) |