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Ounalashkastylus
Taxonomy
Ounalashkastylus was named by Chiba et al. (2016).
It was assigned to Desmostylia by Berta (2017); and to Desmostylidae by Chiba et al. (2016), Domning (2018) and Matsui and Tsuihiji (2019).
It was assigned to Desmostylia by Berta (2017); and to Desmostylidae by Chiba et al. (2016), Domning (2018) and Matsui and Tsuihiji (2019).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Ounalashkastylus Chiba et al. p. 291 figs. Figs. 2-6 |
| 2017 | Ounalashkastylus Berta p. 171 |
| 2018 | Ounalashkastylus Domning p. 251 |
| 2019 | Ounalashkastylus Matsui and Tsuihiji p. 11 |
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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.
G. †Ounalashkastylus Chiba et al. 2016
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†Ounalashkastylus tomidai Chiba et al. 2016
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Chiba et al. 2016 | Desmostylid differing from Ashoroa and more basal Desmostylia in having cylindrical, stylodont cusps that wear into rings of enamel surrounding exposed dentine; more derived than Cornwallius in having six or more cusps on lower molars; cheek teeth lower crowned (more primitive) than Desmostylus when compared at a similar minor stage of wear on homologous cusps and as shown by the curvature of the walls of the cylindrical cusps from the base of the crown toward the occlusal surface; less derived than Desmostylus and Vanderhoofius but similar to Cornwallius in that erupted M3 does not lie in a trough developed by a medial eminence; M3 elongate compared to Desmostylus. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Domning et al. 1986 | |||||
Age range: Aquitanian or 23.03000 to 20.44000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aquitanian | USA (Alaska) | Cornwallius sp. (67659) |