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Guemesia ochoai
Taxonomy
Guemesia ochoai was named by Agnolín et al. (2021). Its type specimen is IBIGEO-P 103, a partial skull (braincase), and it is a 3D body fossil. Its type locality is south part, Amblayo Valley, which is in a Campanian/Maastrichtian fluvial siltstone in the Los Blanquitos Formation of Argentina. It is the type species of Guemesia.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Guemesia ochoai Agnolín et al. p. 2 fig. 2–9 |
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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.
†Guemesia ochoai Agnolín et al. 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. L. Agnolín et al. 2021 | Small-sized abelisaurid diagnosable on the basis of the following combination of characters (autapomorphies marked by an asterisk): (1) foramen magnum transversely wider than dorsoventrally tall; (2) ornamentation of frontals with median row of superficial and large pits*; (3) orbital region of each frontal highly pneumatized by the presence of a passage (probably pneumatic and vascular) which communicates the orbital margin of the bone with the dorsal surface of skull roof*; (4) basipterygoid process elongate with distal end posteroventrally oriented and projected below the basal tubera level, and the distance between basipterygoid process and basal tuber shorter than the transverse distance between basal tubera; (5) basal tubera delicate and not thickened, distally separated from each other by a notch in the basituberal web; (6) dorsal margin of the paroccipital process (below the posterolateral alae of the parietals) convex, forming a rounded protuberance; (7) robust and well-defined otosphenoidal crest markedly anteroposteriorly elongate (running from the crista antotica to the base of the paroccipital process); (8) CNs IX-XII open within a well-marked paracondylar recess; (9) supratemporal fossa subdivided by a low ridge at the orbital level; (10) presence of exit foramina for orbitocerebral vein; (12) subdivided lateral tympanic recess; (13) basisphenoid recess small and subcircular in contour, and medially does not reach the neck of the occipital condyle. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Salta) | Guemesia ochoai (type locality: 226523) |