Genus: Trirachodon SEELEY, 1894
Etymology: Greek, tri-, “three”, Greek, rhakhis, “spine, ridge”, Greek, odon, “tooth”: Three ridge tooth. For the three transverse ridges on the molar teeth.
= Inusitatodon BRINK & KITCHING, 1953
Etymology: Latin, Inusitatus, “strange, unusual”, Greek, odon, “tooth”: Strange tooth.
= Trirachodontoides BROOM, 1932
Etymology: Trirachodon + -oides (m): Trirachodon-like one.

Species: kannemeyeri SEELEY, 1894
Etymology:

Holotype: Albany Museum 461

Locality: Burgersdorp District, Eastern Cape Province, Early Triassic.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material: Skull.

Referred material:

BOTHA & CHINSAMY, 2004

Locality: Kestell District, Free (Orange Free) State, South Africa.

Horizon: Driekoppean Formation.

Biostratigraphy: Cynognathus zone.

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

NMQR3282a: Femur.

NMQR3282b: Tibia.

 

Locality: Aliwal North, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone.

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

SAM-PK5881a: Femur.

SAM-PK5881c, b: Tibiae.

SAM-PK5881e, d: Ribs.

SAM-PK5881f: Scapula.

SAM-PK5881g: Scapula.

 

Locality: Bergville, Bergville district, Kwazulu-Natal, South

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone.

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

CGP1/79a: Radius.

CGP1/79b: Ulna.

 

BROILI & SCHRODER, 1935 (X)

Locality: Lady Frere District, Transkei, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone.

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

Number: Not given: Fragmentary left and right maxillae.

 

GROENWALD, WELMAN & MacEACHER, 2001

Locality: Eerste Geluk Farm, northeast Bloemfontein, Kestell District, Free (Orange Free) State, South Africa.

Horizon: Driekoppean Formation.

Biostratigraphy: Cynognathus zone.

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

NMQR 3280: Skull and dentary.

19 more specimens ranging from fragmentary to nearly complete specimens.
Note: Some found in burrows.

 


HOPSON, 1979

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

SAM K4801: Brain case.

 


= Trirachodon berryi SEELEY, 1894
Etymology:
= Trirachodontoides berryi (SEELEY, 1894) BROOM, 1932

Holotype: BMNH 3579

Locality: Lady Frere District, Transkei, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material: Fragmentary skull.

 


= Trirachodon minor BROOM, 1905
Etymology:

Holotype: SAM 5873

Locality: Aliwal North, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material: Rather weathered skull.

 


= Trirachodon? browni BROOM, 1915
Etymology:

Holotype: BNNH 3721 (BMNH R3307?)

Locality: Aliwal North, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material: Fragmentary skull and fragmentary dentary.

 


= Inusitatodon smithi BRINK & KITCHING, 1953
Etymology:

Holotype: RC 312

Locality: Immediately north of the river running in a westerly direction north of the town Lady Frere, on the slope of a koppie, Lady Frere District, Transkei, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material: Fragmentary Skull and dentaries.

Referred material:

KITCHING

Locality: 1/2 mile south of Lady Frere, Lady Frere District, Transkei, Eastern Cape Province, South Africa.

Horizon: Burgersdorp Formation, Tarkastad Subgroup.

Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).

Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.

Material:

Number: Not given: