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Agujaceratops (Aguja horned face)
Taxonomy
Agujaceratops was named by Lucas et al. (2006). Its type is Chasmosaurus mariscalensis.
It was assigned to Chasmosaurinae by Lucas et al. (2006), Longrich (2010), Ryan et al. (2010), Maidment and Barrett (2011), Longrich (2014), Lehman et al. (2017).
It was assigned to Chasmosaurinae by Lucas et al. (2006), Longrich (2010), Ryan et al. (2010), Maidment and Barrett (2011), Longrich (2014), Lehman et al. (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Agujaceratops Lucas et al. p. 370 |
| 2010 | Agujaceratops Longrich p. 692 fig. 10 |
| 2010 | Agujaceratops Ryan et al. p. 185 |
| 2011 | Agujaceratops Maidment and Barrett p. 2 |
| 2014 | Agujaceratops Longrich p. 303 fig. 8 |
| 2017 | Agujaceratops Lehman et al. p. 668 |
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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. †Agujaceratops Lucas et al. 2006 [Aguja horned face]
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†Agujaceratops mariscalensis Lehman 1989
†Agujaceratops mavericus Lehman et al. 2017
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. G. Lucas et al. 2006 | Diagnosis—Agujaceratops is a large ceratopsid most similar to Chasmosaurus and Pentaceratops. Agujaceratops differs from Chasmosaurus in having a relatively deep facial skeleton (at the orbit, though this varies somewhat ontogenetically), relatively short and broad squamosal (length/width < 2), more than 6 relatively large epoccipitals on the squamosal (though some Chasmosaurus have as many as 9), lacking a parietal median bar that is deep or deeper dorsoventrally than wide with a rectangular/subrectangular cross section and flat lateral sides, lacking a jugal flange that contacts the squamosal below the infratemporal fenestra, having a maxilla without a lateral horizontal shelf and a premaxilla without a posterodorsal extension, having relatively long supraorbital horncores and a relatively deep embayment of the posterior median parietal. Agujaceratops differs from Pentaceratops in being smaller, having a premaxilla septal flange along the entire anterior edge of the naris (as in Chasmosaurus), having a nasal horncore that is not centered above the external naris, having a relatively broader and shorter squamosal and a relatively wide frill with a convex lateral margin, that is widest posteriorly (as in Chasmosaurus), having supraorbital horncores that are curved posteriorly (not anteriorly), a posterior border of the parietal that is flattened and plate-like (rather than square and bar like) and a marked but shallower embayment of the posterior median parietal. | |
| T. M. Lehman et al. 2017 | Chasmosaurine ceratopsid with the following unique combination of character states: (1) anteromedial processes of nasals intercede between premaxillae and extend anteriorly along the internarial bar of the rostrum; (2) septal flange of the premaxillae extends along the entire posterior margin of the narial strut; (3) accessory antorbital fenestra present; (4) postorbital horncores posteriorly curved; (5) cornual sinuses absent; (6) posterior end of squamosal with marked dorsal curvature; and (7) lateral ramus of parietal discontinuous (ascending and descending lateral processes of parietal do not meet, and squamosal forms part of the lateral border of the parietal fenestra). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Norman and Weishampel 1991, Marsh 1875, Kiessling 2004 | |||||
Age range: Judithian or 83.60000 to 72.20000 Ma
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Judithian | USA (Texas) | Chasmosaurus mariscalensis (48941 52462 52463 52464) | |
| Late/Upper Campanian | USA (Texas) | Agujaceratops mariscalensis (236770 236774) Agujaceratops sp. (94373 236771) | |
| Late/Upper Campanian | Mexico (Chihuahua) | Chasmosaurus mariscalensis (227230) | |
| Middle Campanian | USA (Texas) | Agujaceratops mariscalensis (236772 236773 236775) | |
| Middle Campanian - Late/Upper Campanian | Mexico (Chihuahua) | Chasmosaurus mariscalensis (35353) | |
| Middle Campanian - Late/Upper Campanian | USA (Texas) | Agujaceratops mariscalensis (236769) Chasmosaurus mariscalensis (22709 25073) |