Genus: Secodontosaurus ROMER, 1936
Etymology:

Species: obtusidens (COPE, 1880) ROMER, 1936
Etymology:
= Theropleura obtusidens COPE, 1880
= Dimetrodon obtusidens (COPE, 1880)

Holotype: AMNH 4007

Locality: Mount Barry, a small elevation 10 miles west of Wichita Falls, Wichita County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material: Fragments of lower jaw, fragmentary skull, several vertebrae, 2 humeri, a femur, and imperfect scapula and fragments of spines.

Referred material:

REISZ, BERMAN & SCOTT, 1992

Locality: South side of Godwin Creek and near its mouth, Archer County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

MCZ 2749: Large badly encrusted skull roof, complete left mandible, and articulated vertebral column with sail.


Locality: South side of Little Wichita River, Texas.

Horizon: Petrolia Formation (formerly Belle Plains Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron upper B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

MCZ 2944: Partial skull with braincase, lower jaw, and extensive postrcanrial material, including articulated vertebral column with well preserved neural spines.

 


Locality: Brier Creek Bonebed, School Land Section 32, Archer County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

MCZ 5134, 6382-6384, 6998: Distarticulated skull elements, including maxillae, transverse flange of pterygoid, articulars, dentaries and lower jaw fragments representing at least 5 individuals.

 


ROMER & PRICE, 1940

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

AMNH 4021: Maxilla.

 


Locality: Wichita Group, Locality Unknown, Texas.

Horizon:

Biostratigraphy:

Age: Early Permian.

Material:

AMNH 4136: Maxilla and other skull elements.

 


Locality: Near the mouth of Beaver Creek in Southwestern Wichita County, Texas.

Horizon: Petrolia Formation (formerly Belle Plains Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron upper B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

AMNH 4062: Occiput and most of the presacral column.

 

Locality: Brier Creek, western Archer County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

UM 9714: 2 maxillae.

UM 3059: Scapulacoroacid.

UM 9698: Pterygoid.

 


Locality: South of Dundee, in northwestern Archer County, Texas.

Horizon: Petrolia Formation (formerly Belle Plains Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron upper B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

AMNH 4046: Maxilla and fragments of other bones, not all belonging to this form.

 


Locality: Godwin Creek, eastern Baylor County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material:

AMNH 4826: Several vertebrae, articular and pterygoid.

 


Locality: Rattlesnake Canyon, Archer County, Texas.

Horizon: Nocona Formation (Admiral Formation).

Biostratigraphy:

Age: Latest Wolfcampain Series, Sakmarian stage, Wichita Group, Leonardian stage, upper lower to lower middle Rotilegendes Epoch, Early Permian.

Material:

MCZ 1124: Skull and mandible, cervical and anterior dorsal vertebrae and scapulocoracoids.

 

= Dimetrodon longiramus CASE, 1907
Etymology:

Holotype: AMNH 4091

Locality: Tit Mountain, Archer County, Texas.

Horizon: Nocona Formation (formerly lower to lower upper Admiral Formation, middle Wichita Group), Lower Wichita Group.

Biostratigraphy: Land-vertebrate faunachron lower B.

Age: Upper Wolfcampanian stage, Upper Rotliegendes Epoch, Early Permian.

Material: Lower jaw and scapulae with vertebrae.

Referred material:

AMNH 4136: A fragmentary jaw.

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Species: willistoni ROMER, 1936
Etymology:

Holotype: FMNH (WM) 745

Locality: Craddock Bonebed, Craddock Ranch, north of Seymour, Baylor County, Texas.

Horizon: Arroyo Formation, Lower Clear Fork Group.

Biostratigraphy: Land-vertebrate faunachron lower D.

Age: Middle Leonardian stage, upper Rotliegendes, Early Permian.

Material: Maxilla and dentary.

Referred material:

FMNH WM 772: Clavicle.

FMNH WM 1316: Scapulocoracoid.

FMNH WM 752: Partial scapula.

FMNH WM 757: Scapula.

FMNH WM 433: Dentary.

 


Locality: Coffee Creek, Baylor County, Texas.

Horizon: Arroyo Formation, Lower Clear Fork Group.

Biostratigraphy: Land-vertebrate faunachron lower D.

Age: Middle Leonardian stage, upper Rotliegendes, Early Permian.

Material:

FMNH WM 1100: Pelvis and femur.

FMNH WM 25: An immature pelvis.