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Miodelphinus miensis
Taxonomy
Miodelphinus miensis was named by Tanaka and Nakagawa (2024). Its type specimen is MPM-Fo1058, a partial skeleton (fragmentary skull with two teeth in situ, right and left periotics and tym- panic bullae, right incus and malleus, four isolated teeth, three possible hyoid bon), and it is a 3D body fossil. Its type locality is Nakaiu, which is in a Burdigalian marine mudstone in the Haze Formation of Japan. It is the type species of Miodelphinus.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Miodelphinus miensis Tanaka and Nakagawa p. 2 figs. Figs 2–13, Tables 1 and 2 |
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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.
†Miodelphinus miensis Tanaka and Nakagawa 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y. Tanaka and R. Nakagawa 2024 | MPM-Fo1058 belongs to a clade of the Squalodelphinidae þ Platanistidae by having a narrow, fan-shaped restricted area between the postorbital ridge of the frontal and subtemporal crest (ch. 145), a deep sub-circular fossa of the squamosal (sensu de Muizon 1987) (ch. 153), and a funnel-like posterior part of the epitympanic hiatus of the periotic (chs 286) (see Discussion). MPM-Fo1058 belongs to the Squalodelphinidae (a clade with Squalodelphis fabianii) by having a large aperture for the cochlear aqueduct with a thin edge of the periotic (chs 188, 193), a deep, V-shaped left antorbital notch with an anteriorly pointed left antorbital process (chs 10, 36), and a squared pars cochlearis of the periotic (Bianucci et al., 2020). Miodelphinus miensis differs from other squalodelphinids and platanistids by having an almost straight ventral edge of the zygomatic process (ch. 116), a weak edge posterodorsal to the stapedial muscle fossa on the periotic (ch. 185), and a large posteriorly widened funnel-like articular depression that opens ventrally. |
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 | Japan (Mie) | Miodelphinus miensis (type locality: 235934) |