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Taxonomy
Pliokogia was named by Collareta et al. (2019).
It was assigned to Kogiinae by Collareta et al. (2019).
It was assigned to Kogiinae by Collareta et al. (2019).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2019 | Pliokogia Collareta et al. p. 611 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Collareta et al. 2019 | Pliokogia apenninica is a small-sized physe- teroid, similar in skull length to Kogia breviceps. It is rec- ognised as a member of Kogiidae based on the following features: estimated bizygomatic width much smaller than 400 mm, presence of a sagittal facial crest, and external nares greatly asymmetric (Lambert et al. 2017a). It is rec- ognised as a member of Kogiinae by the right antorbital notch whose posterior end opens onto the supracranial basin (this work).
The cranium of Pliokogia apenninica differs from other kogiids by the following presumed autapomorphies: (i) pres- ence of a proportionally long rostrum, accounting for more than three fifths of the reconstructed total length of the cra- nium, whose flat dorsal surface is not invaded by the supra- cranial basin; (ii) presence of two well-distinct fossae on the right side of the supracranial basin, including an elongated peripheral maxillary fossa on the caudal portion of the right maxilla, posterior and posteromedial to the corresponding antorbital notch; and (iii) presence of a sagittal vomerine sulcus, reflected in a V-shaped transverse section of the dorsal surface of the vomer along the mesorostral groove. ACTA PALAEONTOLOGICA POLONICA 64 (3), 2019 Pliokogia apenninica further differs from Aprixokogia, Koristocetus, Nanokogia, and Scaphokogia by the thicker and blunter lateral maxillary crest. It further differs from Aprixokogia and Koristocetus by the presence of a subdi- vided right posterior dorsal infraorbital foramen and by the lower temporal fossa. It further differs from Aprixokogia, Scaphokogia, and Thalassocetus by the right antorbital notch opening onto the supracranial basin. It further differs from Aprixokogia and Kogia by the smaller angle between the frontal–maxilla suture line and the coronal plane, along the supraorbital process, with skull in lateral view. It further differs from Aprixokogia and Thalassocetus by the slit-like geometry of the antorbital notches. It further differs from Aprixokogia by the smaller skull length. It further differs from Kogia, Nanokogia, and Praekogia by presenting no lateral expansion of the postnarial eminence of the right pre- maxilla. It further differs from Kogia by the proportionally smaller lacrimojugal complex. It further differs from Kogia breviceps, Kogia sima, and Koristocetus by the absence of any constriction of the right premaxilla at the level of the external bony nares. It further differs from Kogia breviceps and Kogia sima by the supracranial basin not being laterally expanded, by the thinner and not inflated lateral maxillary crest, and by the higher temporal fossa. It further differs from Kogia pusilla, Kogia sima, and Koristocetus by the greater skull length. It further differs from Kogia sima and Scaphokogia by the lack of a left premaxillary foramen. It further differs from Kogia sima by the presphenoid which does not extend anteriorly within the mesorostral groove. It further differs from Koristocetus and Nanokogia by the less obliquely oriented frontal groove. It further differs from Nanokogia and Scaphokogia by having a wider mesorostral groove in the posterior portion of the rostrum. It further differs from Praekogia by having the left premaxilla that does not reach the sagittal facial crest. It further differs from Scaphokogia by the rostrum having a dorsal surface 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, and the supracranial basin that is not spoon-shaped. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||