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Taxonomy
Koristocetus pescei was named by Collareta et al. (2017). Its type specimen is MUSM 888, a partial skull, and it is a 3D body fossil. Its type locality is Aguada de Lomas, which is in a Tortonian foreshore siltstone in the Pisco Formation of Peru. It is the type species of Koristocetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Koristocetus pescei Collareta et al. p. 261 figs. Figs. 2-5 |
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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.
†Koristocetus pescei Collareta et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Collareta et al. 2017 | Koristocetus is a small-sized physeteroid, similar in size to Kogia spp. and Nanokogia. It is recognized as a kogiid based on the following features: bizygomatic width smaller than 40 cm, presence of a sagittal facial crest, external nares greatly asymmetric, and nasals absent. Differs from Aprixokogia, Kogia, and Thalassocetus by the presence of a more delicate postorbital process of the frontal. Differs from Aprixokogia and Kogia by the smaller angle between the frontal–maxilla suture line and the horizontal plane. Differs from Aprixokogia, Kogia breviceps, and K. sima by having a supracranial basin that does not significantly extend onto the dorsal face of the rostrum. Differs from Aprixokogia, Nanokogia, and Praekogia by the foramen magnum being proportionally smaller. Differs from Aprixokogia, Scaphokogia, and Thalassocetus by the antorbital notches extending within the supracranial basin and by the presence of a deep and round notch for the posterior process of the tympanic bulla. Differs from Aprixokogia and Thalassocetus by the slit-like geometry of the antorbital notches. Differs from Kogia, Nanokogia, Praekogia, Scaphokogia, and Thalassocetus by the presence of a single, not subdivided right posterior dorsal infraorbital foramen. Differs from Kogia, Nanokogia, and Praekogia by presenting no lateral expansion of the postnarial eminence of the right premaxilla. Differs from Kogia, Nanokogia, and Thalassocetus by the larger, more anteroposteriorly elon- gated temporal fossa. Differs from Kogia and Nanokogia by presenting well-individualized dental alveoli on the maxilla. Differs from Kogia and Praekogia by the less posteroven- trally elongated postorbital process of the frontal. Differs from Kogia by the proportionally smaller lacrimojugal complex. Differs from Kogia breviceps and K. sima by the proportionally longer rostrum, the supracranial basin not being laterally expanded, the more obliquely oriented frontal groove, and the thin and uninflated lateral maxillary crests. Differs from Kogia sima and Scaphokogia by the lack of a left premaxillary foramen. Differs from Kogia sima by the presphenoid which does not extend anteriorly within the mesorostral groove. Differs from Nanokogia by having a wider mesorostral groove in its posterior portion and a max- illa wider than the premaxilla all along the rostrum. Differs
from Praekogia by having the left premaxilla that does not reach the sagittal facial crest and the presphenoid largely exposed on the ventral aspect of the skull. Differs from Scaphokogia by the rostrum having a dorsal face that is not semicylindrical, the postnarial eminence that significantly contributes to the sagittal facial crest, the sagittal facial crest that is not significantly dislocated towards the left side of the skull, the supracranial basin that is not spoon-shaped, and the supraoccipital shield that does not dip anteriorly. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||