| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Stellasaurus ancellae
Taxonomy
Stellasaurus ancellae was named by Wilson et al. (2020). Its type specimen is MOR 492, a partial skull (an isolated partial skull of a centrosaurine ceratopsid preserving the left lateral parietal bar, proximal portion of the midline parietal bar, near-complete pa), and it is a 3D body fossil. Its type locality is Stellasaurus type, MOR TM-060, which is in a Campanian terrestrial siltstone in the Two Medicine Formation of Montana. It is the type species of Stellasaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Stellasaurus ancellae Wilson et al. |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Stellasaurus ancellae Wilson et al. 2020
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. P. Wilson et al. 2020 | Centrosaurine ceratopsid exhibiting a unique combination of characters intermediate in distribution between the stratigraphically preceding Styracosaurus albertensis and stratigraphically successive Einiosaurus procurvicornis: elongate, erect and recurved nasal horncore and diminutive supraorbital ornamentation with pointed apex, as in Styracosaurus albertensis; parietal with elongate, straight P3 processes (spikes), partially elongate P4 processes (spikes) less than half as long as P3, and non-elongate P5, P6 and P7 processes, as in Einiosaurus procurvicornis; unique P4 elongation, intermediate between that of Styracosaurus albertensis and the stratigraphically successive lowest bonebed of Einiosaurus. As stated above, elongate, erect nasal horncores are variably present in Centrosaurus apertus, though rarely with the same recurvature and degree of hypertrophy as in both Styracosaurus albertensis and Stellasaurus. Einiosaurus procurvicornis specimens o equivalent maturity (e.g. MOR 456 8-9-6-1; young adult, based on degree of P7 and P6 parietal process imbrication and bone surface texture) express strongly procurved nasal horns and rounded masses of bone as supraorbital ornamentation, differing significantly from the facial ornamentation seen in Stellasaurus. |
Measurements
No measurements are available
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|||||
|
|
||||
|
|
||||
|
|
||||
| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Norman and Weishampel 1991 | |||||
Age range: Late/Upper Campanian or 83.60000 to 72.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Montana) | Stellasaurus ancellae (type locality: 52435) |