Genus: Thrinaxodon SEELEY, 1894
Etymology: Greek, thrinax, “trident”, Greek, odon, “tooth”: Trident tooth.
= Ictidopsis BROOM, 1912
Etymology: Greek, iktid- (iktis), “ferret”, Greek, opsis, “face, appearance”: Ferret look.
= Micrictodon BROOM, 1937
Etymology: Greek, mikros, “small”, Greek, iktis, “ferret”, Greek, odon, “tooth”: Little ferret tooth.

Species: liorhinus SEELEY, 1894
Etymology:

Holotype: BMNH R 511

Locality: Thaba ‘Nchu, Free (Orange Free) State, South Africa.

Horizon:

Biostratigraphy:

Age: Unknown.

Material: Skull and fragmentary skeleton.

Referred material:

ABDALA, 1999

Locality: Not given.

Horizon:

Biostratigraphy:

Age: Not given.

Material:

BS 1934 VIII 506: Skull, ribs, humerus, clavicle and interclavicle.

 


BRINK

Locality: In a donga immediately east of Harrismith, Free (Orange Free) State, Cape Province, South Africa.

Horizon:

Biostratigraphy:

Age: Early Triassic.

Material:

National Museum of Bloemfontein 273: Fragmentary skull of a female.

National Museum of Bloemfontein 274: Fragmentary skull of a juvenile.

 

BRINK

Locality: Farm Newcastle, belonging to the Admiralty Estates of Bergville, in the Oliviershook Mountain pass between Bergville in Natal and Harrismith in the Free (Orange Free) State, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone.

Age: Early Scythian Epoch, Early Triassic.

Material:

287: Skull and skeleton curled up.

 


BRINK 1954

Locality: South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone.

Age: Early Scythian Epoch, Early Triassic.

Material:

National Museum, Bloemfontein C354, C392: 2 skulls and fragmentary skeletons.

National Museum, Bloemfontein C395, C373, C394: Skulls.

National Museum, Bloemfontein C174: Anterior half of a skeleton and
skull.

National Museum, Bloemfontein C143: Fragmentary skeleton.

 


COLBERT & KITCHING, 1977

Locality: Thrinaxodon Col. Mount Kenyon, approximately 4 km due south of the southern border of McGregor Glacier at about latitude 85'13"S and about longitude 174'30" E, north flank of Mount Kenyon, East Antartica, Antarctica.

Horizon: Fremouv Formation.

Biostratigraphy:

Age: Anisian Stage, Lower Mid Triassic Epoch, Early Middle Triassic.

Material:

AMNH 9500: Impression of a skeleton, including portions of the palatal region of the skull, portions of the lower jaw, the presacral vertebrae with ribs in articulation, pectoral girdle with right humerus, radius and ulna and left humerus in articulation, left femur and proximal ends of tibia and fibula.

AMNH 9516: Impression of a portion of vertebral column with ribs in articulation, consisting of 11 presacral vertebrae and ribs.

AMNH 9517: Impression of the anterior part of a skull and mandible.

AMNH 9524: Impression of a left ilium and femur.

AMNH 9528: Fragmentary skull and 4 presacral vertebrae with ribs.

AMNH 9529: Fragmentary skull and jaw.

AMNH 9534, 9563: Fragmentary skulls.

AMNH 9553: Impression of foot bones and other miscellaneous bones.

AMNH 9555: Impression of the rock of some 10 presacral vertebrae and a few miscellaneous elements.

AMNH 9570, 9571: Fragmentary skeletons.

 


Locality: Graphite Peak, East Antartica, Antarctica.

Horizon: Fremouv Formation.

Biostratigraphy:

Age: Anisian Stage, Lower Mid Triassic Epoch, Early Middle Triassic.

Material:

AMNH 9546: Fragment of a right maxilla.

AMNH 9547: Posterior part of skull.

 


CROMPTON, 1963

Locality: South Africa.

Horizon:

Biostratigraphy:

Age: Early Triassic.

Material:

Bernard Price, Institute 274: Skull of a juvenile.

Universitats Institut fur Palaontologie u. historische Geologie, Munich: Fragmentary skull.

BMNH R3731: Skull.

BMNH R511a, R5480, SAM K377, K380, K378, K379: Fragmentary skulls.

 


DAMIANI, MODESTO, YATES & NEVELING, 2003

Locality: Farm Elim 623, Bethulie District, Free (Orange Free) State, South Africa.

Horizon:

Biostratigraphy:

Age: Early Triassic.

Material:

BP/1/5905: Nearly complete skull and skeleton found in a burrow.

 


ESTES

Locality: Harrismith, 6 miles on the Bezuitenhout Pass road, then 2 miles east to a farm, and 1 mile north to old stone corrals on the point of a hill overlooking the river, Free (Orange Free) State, Cape Province, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone.

Age: Early Scythian Epoch, Early Triassic.

Material:

UC 42877, 42878: Skulls of a juvenile.

UC 40466, 42865: Skulls.

 

FERNANDEZ, ABDALA, CARLSON, COOK, RUGIDGE, YATES, & TAFFOREAU, 2013

Locality: Admiralty Estates, at the base of Olivershoek Pass (KwaZulu Natal Province, South Africa.

Horizon: Harrismith Member, Normandien Formation.

Biostratigraphy: Lower Lystrosaurus Assemblage Zone.

Age: Early Scythian Epoch, Early Triassic.

Material:

BP/1/5558: Skull and skeleton.

Note: With a nearly complete Labyrinthodon, Broomistega putterilli.

 

HAYCOCK, MASON & WATKEYS, 1997

Locality: Farm of Mr. J. Biggs, 30°26’02”S, 29°00’56”E, eastern Karoo Foreland Basin, South Africa.

Horizon: Palingkloof Member, Balfour Formation.

Biostratigraphy:

Age: Early Triassic.

Material:

Number: Not given: Natural mould of a mandible.

 

Locality: Farm of Mr. J. Biggs, 30°24’53”, 28°59’20”E, eastern Karoo Foreland Basin, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone.

Age: Early Scythian Epoch, Early Triassic.

Material:

Number: Not given: 4 incisors and 1 canine, a complete dentary and a number of carpals or tarsals.

 


van HEERDAN, 1976

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

NM 24, 810: Skulls.

 


van HEERDAN

Locality: Farm Zeekoegat, South Africa.

Horizon:

Biostratigraphy:

Age: Early Triassic.

Material:

OR 23, 24: Skulls and dentaries.

 


HOPSON, 1979

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

BMNH R1713: Brain case.

 


JENKENS, 1971

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

BMNH R.511a: Fragmentary skull and skeleton.

BMNH R3731, AMNH 5265, AMNH 2228, USNM 22812, NMB C143, NMB C392: Fragmentary skeletons.

 


OLSON, 1944

Locality: Unknown, South Africa.

Horizon: Unknown.

Biostratigraphy:

Age: Early Triassic.

Material:

Number: Not given: Skull and lower jaws.

 


= Nythosaurus larvatus OWEN, 1876
Etymology: Greek, Obscure Lizard.

Holotype: BMNH R847

Locality: "Tafelberg", Sneewberg, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Fragmentary skull.

Refereed material:

BMNH R 1715: Cast of brain-cavity.

Note: According to HAUGHTON & BRINK, 1954

Holotype: BMNH R 1715

Locality: East side of Commissie Drift, Caledon River, Free (Orange Free) State, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Imperfect skull.

 

 

= Ictidopsis elegans BROOM, 1912
Etymology:

Holotype:

Locality: Harrismith, Free (Orange Free) State, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Fragmentary skull.

Referred material:

HAUGHTON, 1924

Durban Musuem: Fragmentary skull.

TM 180: Skull.

TM 169: Dentary.

TM 81, 166, 171, 172, 174, 179: Fragmentary skeleton.

TM 81: Fragmentary skeleton.

 


= Ictidopsis formosa HOEPEN, 1916
Etymology:

Holotype:

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

 


= Notictosaurus luckhoffi BROOM, 1936 (partim)
Etymology:

Holotype: RC 107/L 1

Locality: Wapadsberg near Bethesda Road Station, north of Graaff-Reinet, Eastern Cape Province, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Fragmentary skull.

 


= Micrictodon marionae BROOM, 1937
Etymology:

Holotype: Transvaal Museum 1486

Locality: Harrismith, Free (Orange Free) State, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: A tiny skull with lower jaw.

 


= Thrinaxodon putterilli BROOM, 1932
Etymology:

Holotype: Putterill Collection

Locality: Harrismith, Free (Orange Free) State, Cape Province, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Skull.

Referred material:

BRINK, 1954

Locality: Harrismith, Free (Orange Free) State, Cape Province, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material:

National Museum, Bloemfontein, C393: Fragmentary skull.

 


= Notictosaurus gracilis BROOM & ROBINSON, 1948
Etymology:

Holotype: BP 5

Locality: Elim, Burgersdorp, Honing Kraus, Eastern Cape Province, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Nearly complete skull.