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Norisdelphis annakaensis
Taxonomy
Norisdelphis annakaensis was named by Kimura and Hasegawa (2020). Its type specimen is GMNH-PV-3463, a partial skull (with isolated left tympa- nic bulla and single tooth firmly attached to the cranium), and it is a 3D body fossil. Its type locality is Usui River, which is in a Tortonian marine horizon in the Haraichi Formation of Japan. It is the type species of Norisdelphis.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Norisdelphis annakaensis Kimura and Hasegawa 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.
†Norisdelphis annakaensis Kimura and Hasegawa 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Kimura and Y. Hasegawa 2020 | Norisdelphis differs from all other Delphinidae by having transversely narrow and anteroposteriorly elongated exter- nal bony nares and a wider proximal extremity of the left premaxilla; differs from all Delphinidae except Australodelphis by having an anteriorly pointed apex of the supraoccipital process in dorsal view; differs from all Delphinidae except Arimidelphis, Cephalor- hynchus, Eodelphinus, Etruridelphis, Lagenodelphis, Lagenor- hynchus, and Lissodelphis by possessing a moderately slender and elongated rostrum (width/length ratio: 0.5 in the holotype of Noris- delphis); differs from Globicephala and Protoglobicephala in the premaxilla not being much larger than the maxilla on most of the rostrum; differs from Eodelphinus by lacking a medially positioned premaxillary foramen; differs from Australodelphis by lacking verti- cal premaxillary flanges at the nares, a long, gracile, and edentulous rostrum, and a deep, skewed ventral groove of the tympanic bulla; and differs from Arimidelphis by having a wider antorbital notch, and slender teeth. |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Uhen 2004, Nowak 1991 | |||||