Euparkeria capensis (Broom 1913, SAM 5867) Early Triassic, ~247 mya, 60 centimeter length, Both were derived from the larger BPI/i/4016 specimen of Proterosuchus and the FMNH UC 1528 specimen of Youngoides. Euparkeriids preceded erythrosuchids like Garjainia and other archosauriforms like Riojasuchus, Ornithosuchus and Vjushkovia.

Distinct form Youngoides, Euparkeria had a taller snout and larger naris, shifting dorsally on the skull. Like other basal archosauriforms, Euparkeria had a larger naris, and an antorbital fenestra. The lateral temporal fenestra was not as long because the squamosal and quadratojugal bowed into it. The teeth were larger and fewer. The palate was wider at mid-rostrum, losing the pinched-in appearance. The palatal processes of the maxilla contacted the vomers.

As in other archosauriforms, the cervicals were more robust and the tail was longer.

The pectoral girdle was sightly smaller. The pubis dipped below the ventral rim of the remaining pelvis and the ischium extended posteriorly, as in Garjainia, but the pubis and ischium retained a long contact. Metatarsal 4 was reduced, subequal to mt3. Pedal digit IV was shorter than III and digit V was reduced to a vestige. The pedal digits were shorter than the metatarsals.

Euparkeria is a much smaller and more agile proterosuchid. It nests at the base of the next clade of euarchosauriformes that gave rise to larger ornithosuchids, rauisuchids and their descendants, including dinosaurs and crocodilians.

Euparkeria capensis? (Broom 1913, SAM 6047a) Early Triassic, ~247 mya) is a basal archosauriform close to the SAM 5867 specimen.

Tasmaniosaurus triassicus (Thulborn 1986, Early Triassic) was originally considered a member of the Proterosuchidae. Here it nests with the SAM 6047a spcecimen of Euparkeria.

Borsuk-Bialynicka M and Evans SE 2009. Cranial and mandibular osteology of the Early Triassic archosauriform Osmolskina czatkowicensis from Poland. Palaeontologia Polonica 65, 235–281.

Broom R 1913. On the South-African Pseudosuchian Euparkeria and Allied Genera. Proceedings of the Zoological Society of London 83: 619–633.

Ewer RF 1965. The Anatomy of the Thecodont Reptile Euparkeria capensis Broom Philosophical Transactions of the Royal Society London B 248 379-435.
doi: 10.1098/rstb.1965.0003

Nesbitt SJ, Sidor CA, Angielczyk KD, Smith RMH and Tsuji LA 2014. A new archosaur from the Manda beds (Anisian, Middle Triassic) of southern Tanzania and its implications for character state optimizations at Archosauria and Pseudosuchia, Journal of Vertebrate Paleontology, 34:6, 1357-1382.

Sookias RB, Dilkes D, Sobral G, Smith RMH, Wolvaardt FP, Arcucci AB, Bhullar B-AS, and Werneburg I 2020. The craniomandibular anatomy of the early archosauriform Euparkeria capensis and the dawn of the archosaur skull. R. Soc. Open Sci. 7: 200116.
http://dx.doi.org/10.1098/rsos.200116

Thulborn, RA 1986. The Australian Triassic reptile Tasmaniosaurus triassicus (Thecodontia: Proterosuchia). Journal of Vertebrate Paleontology 6(2):123–142.

Wu X 1982. Two pseudosuchian reptiles from Shan-Gan-Ning Basin. Vertebrata PalAsiatica 20: 289–301.

wiki/Euparkeria
wiki/Tasmaniosaurus