Species: magniventris BROWN, 1908
Etymology: Latin, magnus, "great" and Latin, venter, "belly."

Holotype: AMNH 5895

Locality: 61-67 m below the K-T boundary, near Gilbert Creek, probably somewhere in Sec. 27, or 28, T 22N, R 40E, 120 miles north of Miles City, Custer County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Top of skull, 2 teeth (?), 5 cervical, 11 dorsal, 3 caudal vertebrae, fragmentary sacrum, right scapulocoracoid, ribs, dermal armor, and many fragments.

Ankylosaurus magniventris (modified from CARPENTER, 2008), Holotype: AMNH 5895.

Half a cervical ring with large primary scute and small secondary scute in (starting from the top), dorsal, closeup on th eupper scute ridge, inside, posterior, lateral, anterior, close up of secondary scute and ventral view.

Scutes, Upper right are two pectoral scutes in anterior, dorsal and lateral view; Upper left tertiary (?) scutes in dorsal, anterior and lateral views; Lower right; Pectoral scutes in dorsal, anterior and lateral views.

Tertiary scute.

Referred material:

BRAMAN & EBERTH, 1987/COOMBS, 1971

Locality: 45.4 m below the K-T boundary, a sandstone near the top of the beds, left bank of the Red Deer River, centr of Sec. 26, T33, R22, 1 1/2 miles above Tolman, left bank of Red Deer River, Wheatland 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:

AMNH 5214: Skull and jaws, humeri, left femur, right fibula, left ischium, 6 ribs, 9 dermal plates, 7 terminal caudal vertebrae with tail club.

Ventral view of skull.

Scutes, Upper left) Pectoral scute in dorsal, ventral and anterior view; Upper right) tertiary (?) scutes in dorsal and anterior views; Middle) tertiary scutes in dorsal, anterior and lateral views; Lower left) tertiary (?) scutes in dorsal and anterior views; Lower right), pectoral scute in dorsal and lateral view.

 

Skeleton and life restoration.

 

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

AMNH 5213:

 

Locality: 43.9 m below the K-T boundary, right bank of the Red Deer River, northwest corner of legal subdivision 7, northwest corner of southeast 1/4, S35, T33, R22, West of 4th Meridian, 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:

NMC 8880: Skull and jaws.

Ankylosaurus magniventris (modified from MALLON, 2015), NMC 8880.

ARBOUR & MALLON, 2017

Locality: Coulee south of the village of Simmie, Saskatchewan Province, China.

Horizon: Frenchman Formation, Uppermost Edmonton Group.

Biostratigraphy:

Age: Lancian Age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Upper Gulf Epoch, Late Cretaceous.

Material:

RSM P99.1, 99.4: Osteoderms.

Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 124399: Tooth.

 

 

Locality: UCMP V-73076, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 120195: Tooth.

 

Locality: UW locality V-93002, Albany County, Wymoing.

Horizon: Ferris Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW 26291: Tooth.

 

Locality: UW locality V-93016, Albany County, Wymoing.

Horizon: Ferris Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW 26293: Tooth.

 

Locality: UW locality V-92027, Albany County, Wymoing.

Horizon: Ferris Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW 26294: Osteoderm.

 

Locality: UW locality V-92041, Albany County, Wymoing.

Horizon: Ferris Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW 26294: Osteoderm

 

Locality: UW locality V-92012, Albany County, Wymoing.

Horizon: Ferris Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW?: Osteoderm.

= Ankylosaurus cf. magniventris 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 14095: Tooth.

 

CARPENTER, 1982

Locality: UCMP V73076, Engdahl Anthills 2, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 120195: Teeth of a juvenile.

 

Locality: UCMP V5630, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 124399: Teeth of a juvenile.

 

CARPENTER, 2004

Locality: Somewhere in Sec. 14, 15, or 16, t 40N, R 63W, Seven Mile Creek Drainage, Niobrara County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

AMNH 5866 (partim): 77 plates and smaller osteoderms.

Note: OSBORN 1905, 1906, 1916/WALKER, 1964, found with the type of Dynamosaurus imperiosus, Note: Similar to Hoplitosaurus and Palaeoscincus. Originally thought to be part of Dynamosaurus imperiosus. CARPENTER shows that these osteoderms belong to Ankylosaurus.

Locality: East side along the Powder River Drainage, somewhere in R 15, T53E, - 24 km south of Powderville, Powder River County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

CCM V03: Section of fused caudal vertebrae.

 

 

STEIN, 2021

Locality: Tooth Draw Deposit, Butte County, South Dakota.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

TD-13-212: Scutes.

Numbers: Not given: Teeth, and borken, highly abraded osteoderms.