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Oneirosaurus caballeroi
Taxonomy
Oneirosaurus caballeroi was named by Páramo Fonseca et al. (2025). Its type specimen is IGMp879524, a partial skull (nearly complete skull with articulated mandible, lacking its anterior end, and disarticulated atlas), and it is a 3D body fossil. Its type locality is La Azufrada, which is in a Coniacian marine mudstone/wackestone in the Galembo Formation of Colombia. It is the type species of Oneirosaurus.
Entered
by F. Aspromonte (authorized by E. Vlachos) on 2026-05-14; modified by F. Aspromonte on 2026-05-13
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Oneirosaurus caballeroi Páramo Fonseca et al. figs. 2-6 |
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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.
†Oneirosaurus caballeroi Páramo Fonseca et al. 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. E. Páramo Fonseca et al. 2025 | Oneirosaurus caballeroi (IGMp879524) is a plioplatecarpine having one character unknown in any other plioplatecarpine: the presence of two external foramina for the exit of nerves X, XI and XII. Oneirosaurus caballeroi is also defined by the following unique combination of characters: prefrontal and postorbitofrontal separated at the roof of the orbit (differing from Platecarpus Cope, 1869, Plioplatecarpus Dollo, 1882, and Latoplatecarpus Konishi and Caldwell, 2011); broad frontal (almost 70% of its length), with short triangular surface anterior to the orbits (differing from Yaguarasaurus, Russellosaurus Polcyn and Bell, 2005, Tethysaurus Bardet et al., 2003, Ectenosaurus Russell, 1967 and Sarabosaurus Polcyn et al., 2023); triangular and broad anterodorsal surface of the parietal (as in Yaguarasaurus, Russellosaurus, Tethysaurus, Angolasaurus Telles-Antunes, 1964, and Selmasaurus Wright and Shannon, 1988), contacting the postorbital for a short
distance (differing from Yaguarasaurus); suspensory rami of parietal anteriorly broad (as in Yaguarasaurus) originating below the narrowest part of the longitudinal dorsal table and posteriorly short (differing from Yaguarasaurus); parietal foramen small and located entirely in the parietal (as in Yaguarasaurus, Russellosaurus, Tethysaurus, Angolasaurus, and Selmasaurus); infrastapedial process of the quadrate robust without being fused to the suprastapedial process (as in Platecarpus and Selmasaurus); distal condyle of the quadrate saddle-shaped (as in Yaguarasaurus, Russellosaurus, Tethysaurus, and Pannoniasaurus Makádi et al., 2012); small otosphenoidal crest of prootic not covering the exit of nerve VII (differing from Yaguarasaurus, Russellosaurus, Tethysaurus, Platecarpus, and Latoplatecarpus); basioccipital canal opening into the floor of the braincase through two large foramina separated by a medial septum (as in Plesioplatecarpus Konishi and Caldwell, 2011 and Angolasaurus); pterygoid anterior teeth not distinctly smaller (differing from Sarabosaurus); lingual alveolar parapet of dentary lower than labial (as in Yaguarasaurus, Russellosaurus, and Romeosaurus Palci et al., 2013); marginal teeth crown with subcircular cross-section at base (differing from Tethysaurus) and with two carinae arranged at 180º, one mesial and the other distal (differing from Yaguarasaurus and Angolasaurus); presence of a notch in anterior border of the atlas neural arch (also in Ectenosaurus and Sarabosaurus). |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Gervais 1852, Kiessling 2004, Hendy et al. 2009, Carroll 1988 | |||||