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Samaydelphis chacaltanae
Taxonomy
Samaydelphis chacaltanae was named by Lambert et al. (2021). Its type specimen is MUSM 566, a skull, and it is a 3D body fossil. Its type locality is Cerro Colorado O25, which is in a Tortonian marine horizon in the Pisco Formation of Peru. It is the type species of Samaydelphis.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Samaydelphis chacaltanae Lambert et al. figs. Figures 3–9 |
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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.
†Samaydelphis chacaltanae Lambert et al. 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Lambert et al. 2021 | This small size inioid (bizygomatic width between 144 and 152 mm) can be distinguished from other extinct and modern inioids by the following unique combination of mor- phological characters: proportionally short rostrum comprising 56–58% of the condylobasal length; no lateral groove along the premaxilla–maxilla suture on the rostrum; narrow dorsal open- ing of the mesorostral groove along the whole rostrum length; shallow, anterolaterally open antorbital notch; no significant dorsoventral thickening of the lacrimal; premaxillary foramen posterior to the level of the antorbital notch; dorsoventrally high and transversely thick ridge along the anteromedial border of the posterolateral sulcus; moderately dorsoventrally thickened premaxillary eminence; contact between the ascending process of
the premaxilla and the corresponding nasal; vertex of the skull significantly higher than the premaxillary eminences; nasals roughly as transversely wide as the bony nares; nasals reaching the same dorsoventral height as the frontals on the vertex; no internasal fossa; long anteromedial projection of frontals between nasals on the vertex; long anteromedial projection of interpari- etal between frontals on the vertex; long anteromedial projection of the occipital shield between the maxillae; ventral margin of the occipital condyles at about the same dorsoventral level as the ventral margin of the temporal fossa; broadly separated anterior apices of palatines; upper tooth count of c. 30 teeth per row; at least 11 post-symphyseal teeth on the mandible; no lingual heel on the crown of posterior teeth; and transverse process of the axis being posterolaterally directed. See the discussion section for a more detailed comparison with extant and extinct inioids. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||