Euparkeria capensis (Broom 1913) Early Triassic, ~247 mya, 60 centimeter length, was derived from a sister to Garjainia and preceded Riojasuchus, Ornithosuchus, Arizonasaurus and Vjushkovia.

Distinct form Garjainia, Euparkeria had relatively smaller skull. It had a larger naris, antorbital fenestra and orbit, which means the surrounding bones were lighter, more gracile. The jugal did not have such a sharp descent. The maxilla was not strongly convex ventrally and no distinct notch developed between the premaxilla and maxilla.

All the neural spines were lower and the tail was relatively longer.

The pectoral girdle was smaller. Then medial metacarpals were larger than the lateral ones in diameter.

The pubis and ischium has a continuous ventral rim. The pedal metacarpals and digits were also larger in diameter medially. Pedal digit IV was shorter than III and V was reduced to a vestige. The metatarsals were longer than the digits.

Above is the skull of Osmolskina czatkowicensis (Borsuk-Biaynicka and Evans 2009), Early Triassic, was considered a sister to Euparkeria. The large overhanging premaxilla also points to Garjainia and Riojasuchus. This taxon has not been tested as of this writing.

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

wiki/Euparkeria