Species: atopus LANGSTON, 1960
Etymology: Greek, atopus, "stange, out of place," an allusion to the form an deposition of the nasal crest.

Holotype: FMNH P27383

Locality: 200 yards north of road, High River Exposure, Moore Ranch, southeast of Marion Junction, and 10 miles west of Selma, Dallas County, Alabama.

Horizon: Selma Formation, blow Arkola Limestone.

Biostratigraphy:

Age: Early Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Fragments of skull, jaws, vertebrae, ribs, and various limb bones.

Referred material:

EBRSOLE & KING, 2011

Locality: Greene County, Alabama.

Horizon: Mooreville Chalk Formation.

Biostratigraphy:

Age: Late Santonian-Early Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

MCWSC RMM 2985: 4 anterior phalanges (1 terminal).

 

EBRSOLE & KING, 2011

Locality: Hale County, Alabama.

Horizon: Mooreville Chalk Formation.

Biostratigraphy:

Age: Late Santonian-Early Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

MCWSC 1219: 6 bones from the tarsus.

MCWSC 12620: Vertebrae and bone fragments.

 

Locality: Unknown County, Alabama.

Horizon: Tombigbee Sand Member, Eutaw Formation.

Biostratigraphy:

Age: Late Santonian-Early Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

MCWSC 26037: Skull material.

 

Locality: Montgomery County, Alabama.

Horizon: Selma Group.

Biostratigraphy:

Age: Late Santonian-Early Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

AUMP 982: Left jaw.

LAMB, 1998

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

Number: Not given: Fragmentary skull and fragmentary skeleton.

 

WEISHAMPEL & WEISHAMPEL, 1983

Locality: Phoebus Landing, Bladen County, North Carolina.

Horizon: Black Creek Formation.

Biostratigraphy:

Age: Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: