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Taxonomy
Aondelphis talen was named by Viglino et al. (2018). Its type specimen is MPEF-PV 517, a partial skull (incomplete skull including basioccipital, exoccipitals, squamosals, a portion of the sphenoids, almost complete left tympanic bulla, and complete left periotic.), and it is a 3D body fossil. Its type locality is Bryn Gwyn, which is in a Burdigalian marine siltstone/sandstone in the Gaiman Formation of Argentina. It is the type species of Aondelphis.
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Aondelphis talen Viglino et al. figs. Figs. 2–6, 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.
†Aondelphis talen Viglino et al. 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Viglino et al. 2018 | Aondelphis talen gen. et sp. nov. differs from all other Platanistoidea (sensu lato; see Phylogenetic anal- ysis section) in the unique autapomorphy: convex dorsal surface of periotic (character 182).
Aondelphis talen differs from cf. Papahu ZMT-73 in the absence of a ridge on the inside of the tympanic bulla (char- acter 221). Aondelphis talen differs from Squalodon calvertensis in the concave ventral surface of the posterior process of the periotic (character 201). Aondelphis talen differs from cf. Papahu ZMT-73 and S. calvertensis in the development of an anteroposterior ridge on the dorsal side of the anterior process and body of periotic (character 174). Aondelphis talen differs from Platanistoidea sensu stricto (see Phylogenetic analysis section) in the anteroposteriorly wide and squared-off postglenoid process of the squamosal (character 118); no obvious lateral groove on profile of the periotic (character 172); from the Platanistoidea sensu stricto (except Platanista gangetica) in the tubular fundus of the internal acoustic meatus of the periotic (character 189); from Platanistoidea sensu stricto (except Awamokoa tokarahi and Notocetus van- benedeni) in the weakly-curved parabullary sulcus (character 176). Aondelphis talen differs from S. calvertensis and Platanistoidea sensu stricto in the excavated dorsal margin of the involucrum of the tympanic bulla at mid-length (character 220); in the absence of an articular rim in the periotic (character 196); from S. calvertensis and Platanistoidea sensu stricto (except A. tokarahi and P. gangetica) in the slit-like external auditory meatus (character 157); from S. calvertensis and Platanistoidea sensu stricto (except P. gangetica) in the wide angle between the posterior process and pars cochlearis of the periotic (character 199); from the S. calvertensis and Platanistoidea sensu stricto (except Pomatodelphis inaequalis) in the high lateral wall of the internal acous- tic meatus (character 191). Aondelphis talen further differs from S. calvertensis, and Platanistoidea sensu stricto (except Otekaikea marplesi; unknown in Phocageneus venustus) in the deep emargination of the neck muscle fossa in the zygomatic process of the squamosal (character 114). Aondelphis talen differs from cf. Papahu ZMT-73 and Platanistoidea sensu stricto in the rounded profile of the cochlear aqueduct (character 194); and in the absence of a subcircular fossa (character 152); from cf. Papahu ZMT-73, Squalodelphinidae and Platanistidae in the poorly defined ventromedial keel of the tympanic bulla (character 222). Aondelphis talen differs from Squalodon calvertensis, Awamokoa tokarahi, Otekaikea, Notocetus vanbenedeni, and Platanistidae in the absence of a fossa for articular rim of the periotic (character 287); from S. calvertensis, Waipatia maerewhenua, A. tokarahi, Squalodelphis fabianii, and N. vanbenedeni in the distinctly shorter inner posterior prominence of the tympanic bulla with respect to the outer posterior prominence (character 219); from S. calvertensis and N. vanbenedeni in the smoothly deflected anterior process of the periotic (character 173). Aondelphis talen differs from S. calvertensis, N. vanbenedeni and Platanistidae in the shallow posterior portion of the periotic fossa (character 155). Aondelphis talen differs from S. calvertensis, Phocageneus venustus, N. vanbenedeni, and Platanistidae in the presence of a posterodorsal edge of the stapedial muscle fossa in the periotic (character 184); and a long posterior process of the periotic (character 203). MPEF-PV 517 differs from N. vanbenedeni and Zarhachis flagellator in the open jugular notch (character 164). Aondelphis talen differs from Platanistidae in the triangular tympanosquamosal recess medial to the postglenoid process (character 148); and in the absence of an excavation of the tegmen tympani at the base of the anterior process (character 188). |