Genus: Acheloma COPE, 1882
Etymology:
= Trematops WILLISTON, 1909
Etymology:

Species: cumminsi COPE, 1882
Etymology:
= Trematops willistoni (COPE, 1882) WILLISTON, 1909

Holotype: AMNH 4205

Locality: Coffee Creek, Baylor County, Texas.

Horizon: Wichita Group.

Biostratigraphy:

Age: Early Permian.

Material: Fragmentary skull and dentary.

Referred material:

MCZ 1766: Skull.

 

Locality: 1 mile south of Archer City, Archer County, Texas.

Horizon: Upper Archer City Formation (formerly Putnam Formation, Wichita Group), upper Bowie Group.

Biostratigraphy: Land-vertebrate faunachron upper A.

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

Material:

MCZ 1414: Skull.

MCZ 1413: Fragmentary skeleton.

MCZ 1490: Fragmentary skull and fragmentary skeleton.

CNHM UC 482: Skull.

 

= Trematops milleri WILLISTON, 1909
Etymology:

Holotype: FMNH UC 640

Locality: Bushy Creek, Baylor County, Texas.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material; Fragmentary skull and dentary, and fragmentary skeleton.

Referred material:

Locality: East Coffee Creek, "Broiliellus" bone bed, 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 UC 1759, FMNH UC 1760: Skull and lower jaws.

FMNH UC 282, FMNH UC 283: Femurs.


Locality: East Coffee Creek, Baylor County, Texas.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material:

FMNH UC 1756: Fragmentary skull and fragmentary skeleton.

 

OLSON

Locality: East 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:

Number: Not given: Nearly complete skull and skeleton.

 

OLSON 1967

Locality: South Snyder Site, 10 miles south and a little east of Snyder, Tilman County, Oklahoma.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material:

OUSM 2-1-S36: Fragmentary skull and jaws.

 


= Trematops thomasi MEHL, 1926
Etymology:
= Acheloma thomasi (MEHL, 1926)

Holotype: University of Missouri.

Locality: South Synder Site, 10 miles south and somewhat east of Snyder, Tilman County, Oklahoma.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material: Anterior part of skull.

Referred martial:

Locality: West Coffee Creek, Baylor County, Texas.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material:

FMNH UM 1585: Fragmentary skull.


= Trematops willistoni OLSON, 1941
Etymology: In honor of Samuel Wendell Williston.
= Acheloma willistoni (OLSON, 1941)

Holotype: FMNH UC 1584

Locality: West Coffee Creek, Baylor County, Texas.

Horizon: Clear Fork Formation, Clear Fork Group.

Biostratigraphy:

Age: Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material: Skull and lower jaws with associated postcranial material.

= Trematops stonei OLSON, 1970
Etymology:
= Acheloma stonei (OLSON, 1970)

Holotype: FMNH

Locality: Roadcut on Ohio route 7, at Marietta, 0.7 mile southwest of US Route 50A, Washington County, Ohio.

Horizon: Creston Shale (red Beds) of Washington Formation, Dunkard Group.

Biostratigraphy:

Age: Wolfcampanian stage, upper lower to lower middle Rotliegendes Epoch, Early Permian.

Material: A fragmentary skull.

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Species: dunni POLLEY & REISZ, 2011
Etymology: In honor of Brent Dunn, who has graciously collected and donated several specimens from the Dolese Brothers Co. limestone quarry for study.

Holotype: OMNH 73281

Locality: Fort Sill, OMNH Locality V51, Dolese Brothers limestone quarry at Richards Spur, Fissure Fills, just west of U.S. Highways 62 & 281, 10.5 miles south of Apache, 6 miles north of Fort Sill, SW 1/2, Sec. 31, T4N, R11W, Comanche County, Oklahoma.

Horizon: Wellington Formation (Garber Formation), Summer Group, Arbuckle limestone, (Probably equivalent to the Arroyo Formation of Texas).

Biostratigraphy:

Age: Leonardian Stage, Lower Rotliegendes Epoch, Early Permian.

Material: Nearly complete skull with associated atlas-axis complex and partial lower jaw.

Referred material:

BMRP 2007.3.1: Snout.

BMRP 2007.3.4: Small skull.

OMNH 54365: Jaw articulation.

OMNH 52545: Right humerus.

OMNH 73514: Pelvic girdle.