Genus: Agujaceratops LUCAS, SULLIVAN & HUNT, 2006
Etymology: In reference to Aguja, for the Aguja Formation in Texas and Greek, ceratops, "horned face," a common suffix for the generic name of ceratopsians.

Species: mariscalensis (LEHMAN, 1989) LUCAS, SULLIVAN & HUNT, 2006
= Chasmosaurus mariscalensis LEHMAN, 1989
Etymology: Named for Mariscal Mountain, in the southern part of Big Bend National Park, near the type locality.

Holotype: UTEP P.37.7.086

Locality: Type locality=WPA 1, TMM 42303, 2, southwest of Rattlesnake Mountain (TMM 42534), 3), northeast of Sierra Aguja (TMM 41838), Big Bend National Park, Brewster County, Texas.

Horizon: Upper Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Braincase, left supraorbital horncore, left maxilla, and right dentary.

Referred material:

UTEP P.37.7.142: Right coracoid.

UTEP P.37.7.146: Right pubis.

UTEP P.37.7.067: Premaxilla.

UTEP P.37.7.042-044, 074-079, 082, 086, 089-091, TMM 4138-11 and -13: Supraorbital horncores.

UTEP P.37.7.068, 086, 089, 092, 093: Braincases.

UTEP P.37.7.063, 064, 089, 093: Parietals.

UTEP P.37.7.070, 071: Epoccipitals.

UTEP P.37.7.045, 046, 052-062, 066, 089: Squamosals.

UTEP P.37.7.050, 080: Quadrates.

UTEP P.37.7.069, 081: Jugals.

UTEP P.37.7.082, 084-088, 218: Maxillae.

UTEP P.37.7.073, 086, 087, 089, 094, 095, 096: Dentaries.

UTEP P.37.7.072, 073: Predentaries.

UTEP P.37.7.212-217, TMM 42302-1: Cervical vertebrae.

UTEP P.37.7.188-189, 201-211: Dorsal vertebrae.

UTEP P.37.7.176-187: Caudal vertebrae.

UTEP P.37.7.001, 166, 168, 169: Sacrals.

UTEP P.37.7.023, 134-140, TMM 42302-1, TMM 42534-19, -20: Scapulae.

UTEP P.37.7.032, 140-143, TMM 42303-1: Coracoids.

UTEP P.37.7.026, 097-108: Humeri.

UTEP P.37.7.012, 161-163: Ulnae.

UTEP P.37.7.013, 159, 160: Radii.

UTEP P.37.7.021: Metacarpal.

UTEP P.37.7.165: Phalanges.

UTEP P.37.7.039, 147-156: Ilia.

UTEP P.37.7.1543-146: Pubis.

UTEP P.37.7.157, 158: Ischia.

UTEP P.37.7.009, 016-018, 031, 040, 109-120: Femora.

UTEP P.37.7.010, 011, 035, 122-133, 297: Tibiae.

UTEP P.37.7.014, 121, 164, 289, 290: Fibulae.

UTEP P.37.7.037: Metatarsal.

Composite skulls; A) Baed on the type specimen P.37.7.086, 046, 065, 066; B) based on 062, 064, 073, 0872; C) based on 045, 087, 088, 091; D) based on 059, 072, 085, 095 (Modifed from LEHMAN, 1989).

Orbital horns; A) UTEP P.37.7.090; B) .44; C) .083; D) .091; E) .082; F) .086. (Modifed from LEHMAN, 1989).

Parietal fragments; UTEP P.37.7.065, A) Posteromedial; B) Anterolateral; C) Posterolateral. (after LEHMAN, 1989).

Epoccipital; A) UTEP P.37.7.070, B) 071. (after LEHMAN, 1989).

Composite frill based on UTEP P.37.7.046, 063, 066, 070, 071. (Modifed from LEHMAN, 1989).

Locality: WPA 3, TMM 42303, 2, southwest of Rattlesnake Mountain (TMM 42534), 3), northeast of Sierra Aguja (TMM 41838), Big Bend National Park, Brewster County, Texas.

Horizon: Upper Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UTEP P.37.7.065: Parietal.

UTEP P.37.7.005, 006: Humeri.

 

ANDRADE-RAMOS, MONTELLANO-BALLESTEROS, CEVALLOS-FERRIZ, S., & LOZANO-GARCEA, 2002

Locality: Altares, Chihuahua State, Mexico.

Horizon:

Biostratigraphy:

Age: Late Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

Number: Not given: Left squamosal, 5 epoccipitals, and a supraorbital horncore.

 

LEHMAN, WICK, & BARNES, 2016

Locality: San Vicente, Big Bend National Park, Brewster County, Texas.

Horizon: Upper Shale Member, Upper Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

TMM 46500-1 (San Vicente Exemplar): Disarticulated, partial skull of a ver large, mature individual, both postorbitals, parts of both squamosals, jugals, and lacrimals, part of the right quadrate, fragments of partial, braincase, parts of both dentaries, the right surangular, and other fragments of uncertain identy.

 

Locality: Bruja Canyon, Big Bend National Park, Brewster County, Texas.

Horizon: Upper Shale Member, Upper Aguja Formation.

Biostratigraphy:

Material:

TMM 46502-1 (Bruja Canyon exemplar): Parts of a premaxilla, squamosal and parietal alogn with a few postcranial elements (caudal vertebrae).

 

Locality: East River Road, Big Bend National Park, Brewster County, Texas.

Horizon: Lower Shale Member, Upper Aguja Formation.

Biostratigraphy:

Age: Late Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

TM 46501 (River Road exemplar): TMM 46501-1: Partial and lower jaw.

TMM 46501-2: Right humerus and radius.

RAMIREZ-VELASCO, & HERNANDEZ-RIVERA, 2015

(Rivera-Sylva & Carpenter, 2014)

Locality: Near town of San Miguel, Ocampo, Coahulia State, Mexico.

Horizon: Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

CPC, number not given: Left suamosal.

 

Cf. Chasmosaurus mariscalensis WESTGATE, PITTMAN, BROWN & COPE, 2002

Locality: Parque Nacional Canon de Santa Elan National Area of Protection, Chihuahua State, Mexico.

Horizon: Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given:

 _____________________________________________________________________________________

Species: mavericus LEHMAN, WICK, & BARNES, 2016
Etymology: A 'maverick' is an unbraded range animal, or a lone dissenter (in this case, a single specimne that differs from others). The term refers here particularly to the Old Maveric Road, Brewster County, Texas, an unimproved road that transverses the western border of Big Bend National Park, and passes near where the holotype was collected.
= Chasmosaurus mariscalensis FORSTER, SERENO, EVANS & ROWE, 1993

Holotype: TMM 43098-1

Locality: Windy City (TMM 43098), southwest of Rattlesnake Mountain in Big Bend National Park, Lat. 29’13”, long 103’33”, Brewster County, Texas.

Horizon: “Upper Shale Member”, Aguja Formation.

Biostratigraphy:

Age: Late Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Well preserved skull lacking distal left supraorbital horncore, distal left jugal, left squamosal, and distal parietal.

Referred material:

TMM 46503-1: An isoalted right postorbital horncore.

LEHMAN, 1989

Locality: TMM 42534, Rattlesnake Mountain, Big Bend National Park, Brewster County, Texas.

Horizon: Aguja Formation.

Biostratigraphy:

Age: Edmontonian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: