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Kentriodon sugawarai
Taxonomy
Kentriodon sugawarai was named by Guo and Kohno (2021). Its type specimen is NMHF 999, a partial skull (incomplete skull including most of the neurocranium and a proximal portion of the rostrum, one tooth, the right tympanoperiotic and malleus, fragments of the le), and it is a 3D body fossil. Its type locality is Mabechi River, which is in a Burdigalian/Langhian deep-water siltstone in the Kadonosawa Formation of Japan.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Kentriodon sugawarai Guo and Kohno p. 5 figs. Figs. 2–11, Table 1 |
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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.
†Kentriodon sugawarai Guo and Kohno 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Z. Guo and N. Kohno 2021 | Kentriodon sugawarai sp. nov. differs from K. schneideri by the
convex occipital shield (Chr. 176). It differs from K. pernix, K. nakajimai and K. obscurus by the following characters: the dorsolateral edge of the opening of the ventral infraorbital foramen is formed by the maxilla and the lacrimal or the jugal (Chr. 58), at least three anterior dorsal infraorbital foramina (Chr. 65), anterolateral corner of the nasal lacking a distinct inflated process (Chr. 136), narrow width of the squamosal lateral to the exoccipital (Chr. 170), anterior level of the pterygoid sinus fossa is interrupted posterior to (or at the level of) the antorbital notch (Chr. 193), and the ventral edge of the anterior process of the periotic is clearly concave in lateral view (Chr. 245). Further differs from Kentriodon hoepfneri and K. nakajimai by the apex of the postorbital process of the frontal that is directed ventrally rather than posterolaterally, by the angle between anterior process of periotic and anterior edge of pars cochlearis that is nearly 90 . It differs from K. nakajimai, K. diusinus and K. schneideri by displaying a deep emargination of the posterior edge of the zygomatic process by the neck muscle fossa. It differs from Kentriodon hobetsu, K. schneideri and K. pernix by the transversely narrower exoccipital and by the maxillae that makes a deep fossae on each side at the vertex. It differs from K. obscurus and K. pernix by the aperture for the cochlear aqueduct that is transversely smaller than the aperture for the vestibular aqueduct. It further differs from K. pernix by having a shallower lateral furrow of the tympanic bulla. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Burdigalian to the top of the Langhian or 20.45000 to 13.82000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian - Langhian | Japan (Iwate) | Kentriodon sugawarai (type locality: 218914) |