Genus: Chamops MARSH, 1892
Etymology:
= Lanceosaurus GILMORE, 1928
Etymology: In reference to Lance Creek, and Greek, sauros, "lizard."
= Alethesaurus GILMORE, 1928
Etymology:
Species: segnis MARSH, 1892
Etymology:
Holotype: YPM 1036
Locality: Lance Creek, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Right maxilla containing 5 teeth.
Referred material:
AMNH 988: Right dentary.
ARMSTRONG-ZIEGLER, 1978
Locality: MNA site A (= MNA 107), Hogback South, 7 1/2 quadrangle, T26N, R16W, 108'29"10W Long. 36'16"10N Lat. 30 miles southwest of Farmington, San Juan County, New Mexico.
Horizon: Fruitland Formation.
Biostratigraphy:
Age: Kirtlandian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given:
BREITHAUPT, 1982
Locality: East flank of Rock Springs Uplift, Sweetwater County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UW 14130, 14131, 14132, 14133: Dentary fragments.
BRYANT, 1990
Locality: Eastern Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UCMP 120184: Dentary.
UCMP 128874: Dentary.
EATON, DIEM, ARCHIBALD, SCHIERUP & MUNK, 1999
Locality: UMNH VP Locality 10, Paul’s Locality, Markagunt Plateau, Southern Utah.
Horizon: Tibbet Canyon Member, Straight Cliffs Formation.
Biostratigraphy:
Age: Upper Turonian Stage or Lower Coniacian Stage, lowest Senonian subepoch, lower Gulf Epoch, Early Late Cretaceous.
Material:
Number: Not given:
ESTES, 1964
Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UCMP 46032: Left maxilla, nasal process broken.
UCMP 46033: Left maxilla, complete except for the dorsal part of the nasal process.
UCMP 46094: Anterior end of left maxilla with nasal process complete dorsally.
UCMP 46100: Anterior end of left maxilla.
UCMP 46614: Dentary showing malformed teeth.
UCMP 47782: Anterior end of left maxilla.
UCMP 49871: Almost complete left dentary.
UCMP 49833: Right maxilla.
UCMP 49872: Anterior half of right dentary.
UCMP 49874: Anterior half of left maxilla.
UCMP 49877: Posterior half of right maxilla.
UCMP 49878: Anterior half of left dentary.
UCMP 49880: Posterior half of left dentary.
UCMP 49881: Left dentary.
UCMP 49888: Fused premaxillae, broken laterally.
UCMP 50029: Posterior half of right maxilla.
UCMP 54217: Anterior half of left dentary and splenial.
UCMP 57148: Fused frontals.
UCMP 57146: An almost complete quadrate.
UCMP 57145: Left ilium.
Locality: UCMP V-5711, Bushy Tailed Blowout, Quarry area includes the floor of a small blowout approximately 10 yards northwest of the highest point on the ridge forming the northeastern side of the blowouts of loc. V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UCMP 49811: Anterior half of right maxilla.
UCMP 49812: Segment of right maxilla.
UCMP 49813: Posterior end of left maxilla.
UCMP 49814: Right maxilla.
UCMP 54206: Premaxilla.
Many other numbered and unnumbered specimens are present from the following localities, U.C. localities V-5003, V-5610-V-5620, V-5623, V-5711 and V-5815.
Locality: UCMP V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.
Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.
Locality: UCMP V-5711, Bushy Tailed Blowout, Quarry area includes the floor of a small blowout approximately 10 yards northwest of the highest point on the ridge forming the northeastern side of the blowouts of loc. V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.
Locality: UCMP V-5815, Hatcher Number 2, western side of a cross-stratified sandstone erosional remnant near the center of a large blowout on the crest of a ridge, the distance form the nearest point on the road, approximately 150 yards south of the quarry, to the Johnson ranch is 0.4 miles, Niobrara County (Formerly Converse County), Eastern Wyoming.
Horizon: Lance Formation.Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Numbers: Not given:
ESTES, 1969
Locality: Leduc County, Alberta Province, Canada.
Horizon: Wapiti Formation.
Biostratigraphy:
Age: Late Cretaceous.
Material:
NMNS 8891: Left dentary and splenial.
ESTES, BERBERIAN & MESZOELY, 1969
Locality: Bug Creek Anthills locality, McCone County, Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
MCZ 3659: Dentary fragment, fragment of left maxilla, 4 unnumbered tooth-bearing fragments.
MCZ 3660: Fragmentary parietals.
GAO & FOX, 1996
Locality: Gryde Locality, Frenchman River Valley, Southwestern Saskatchewan Province, Canada.
Horizon: Frenchman Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
SMNH P1927.824-825, P1927.831, P1927.876, P1927.882, P1927.899, P1927.966, P1927.993, P2004..86: 10 Incomplete maxillaries.
SMNH P1927.827, P1927.874, P1927.883, P1927.890, P1927.991: 6 fragmentary dentaries.
Locality: Wounded Knee Locality, Frenchman River Valley, Southwestern Saskatchewan Province, Canada.
Horizon: Frenchman Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UALVP 29728, 29811-29812: Fragmentary dentaries.
Locality: KUA-1, Stettler County, Alberta Province, Canada.
Horizon: Scollard Formation, Uppermost Edmonton Group.
Biostratigraphy:
Age: Lancian Age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Upper Gulf Epoch, Late Cretaceous.
Material:
UALVP 29841: Fragmentary maxillary.
Locality: KUA-3, Alberta Province, Canada.Horizon: Scollard Formation, Uppermost Edmonton Group.
Biostratigraphy:
Age: Lancian Age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Upper Gulf Epoch, Late Cretaceous.
Material:
UALVP 29842-29843: Incomplete dentaries.
LUCAS & GONZALEZ-LEON, 1993
Locality: Locality 19, Northeastern Sonora, Sonora State, Mexico.
Horizon: Pacard Formation, Cabullona Group.
Biostratigraphy:
Age: Late Cretaceous.
Material:
IRGNM-201: A small right dentary.
MUNK, 1993
Locality: UMNH VP Locality 77, Bryce Canyon National Park, Garfield County, Utah.
Horizon: Wahweap Formation.
Biostratigraphy:
Age: Aquilian in age, Lower Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Material:
UMNH VP 6992 (NPS accession number 417, catalogue number 3944): Incomplete left maxillary.
= Chamops cf. C. segnis NYDAM, 2013
Locality: OMNH Locality V1404, approximately 13 km southeast of the town of Henrieville, Kane County, Utah.
Horizon: Smoky Hollow Member, Straight Cliffs Formation.
Biostratigraphy:
Age: Upper Turonian Stage, upper Gallic subepoch, lower Gulf Epoch, Early Late Cretaceous.
Material:
OMNH 6366: A fragment from the posterior portion of a left maxilla, preserving 2 tooth spaces and a single tooth.
= Chamops sp., cf. Chamops segnis NYDAM, & VOCI, 2007
Locality: UMNH locality V108, approximately 14 km northeast of the town of Henrieville, Garfield County, Utah.
Horizon: Lower Kaiparowits Formation.
Biostratigraphy:
Age: Judithian age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
OMNH 23201: JAw fragment.
UMNH VP 18062: Broken left dentary.
Locality: OMNH locality V6, approximately 22 km southeast of the town of Henrieville, Kane County, Utah.
Horizon: Lower Kaiparowits Formation.
Biostratigraphy:
Age: Judithian age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
OMNH 23605: Broken right maxilla.
Locality: OMNH locality V9, approximately 26 km southeast of the town of Henrieville, Kane County, Utah.
Horizon: Lower Kaiparowits Formation.
Biostratigraphy:
Age: Judithian age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
OMNH 33852: Jaw fragment with 2 teeth.
SAHNI, 1972
Locality: Claybal Hill, just north of the Judith River on the Missouri River in north-central Montana.
Horizon: Judith River Formation.
Biostratigraphy:
Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Material:
AMNH 8486: Dentary.
Locality: Just north of the Judith River on the Missouri River in north-central Montana.
Horizon: Judith River Formation.
Biostratigraphy:
Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Material:
AMNH 8487: A partial tooth-bearing border of a maxilla.
AMNH 8488: Maxilla.
STENERSON & O’CONNER, 1994
Locality: Northwestern South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given:
= cf. segnis STERNBERG 1951.
Locality: Kleskun Hills, northeast of Grande Prairie, Grande Prairie County, Alberta Province, Canada.
Horizon: Wapiti Formation.
Biostratigraphy:
Age: Late Cretaceous.
Material:
NMC 8891: Fragment of left dentary with 3 teeth and roots of 3 others.
SULLIVAN 1981Locality: UNM V-072, San Juan Basin, New Mexico.
Horizon: Fruitland Formation.
Biostratigraphy:
Age: Kirtlandian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UNM FKK-038a: Fragmentary right dentary.
WALDMAN, 1970
Locality: Steveville, Alberta Province, Canada.
Horizon: Judith River Formation, Judith River Group.
Biostratigraphy:
Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Material:
NMNS 13563: Mandible.
WHITMORE, 1988
Locality: SDSM Locality V851, Zerbst Locality, east of the Cheyenne River, Niobrara County, Wyoming.
Horizon: Lance Formation.Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
SDSM 15106: 1 dentary.
SDSM 15123: 1 vertebra.
= Iguanius teres MARSH, 1892
Etymology:Holotype:
Locality: Lance Creek, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Vertebrae.
= Lanceosaurus hatcheri GILMORE, 1928
Etymology:Holotype: USNM 10706
Locality: Lance Creek, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Greater portion of the left dentary containing teeth.
= Lanceosaurus compressus GILMORE, 1928
Etymology:Holotype: AMNH 116
Locality: Lance Creek, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Fragmentary right dentary containing 8 teeth.
= Alethesaurus quadratus GILMORE, 1928
Etymology:Holotype: USNM 10802
Locality: Quarry No. 1, Lance Creek, Niobrara County, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Fragmentary maxilla.