Species: basileus SENNIKOV, 1999
Etymology: Greek, basileus, “tsar”, from a tribe of the royal Scythians who, according to Herodotus, inhabited the lower reaches of the Don River to the north of the Sea of Azov.

Holotype: PIN, 1043/144

Locality: Donskaya Luka Locality, Lipovskaya Balka Ravine, Village of Sirotinskaya, right boundary of the valley of the Don, Ilovlyansk District, Volgograd Region, European Russia.

Horizon: Lipovskaya Formation, Gamskii Horizon, Yarenskii Superhorizon.

Biostratigraphy:

Age: Late Olenkian, Upper Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material: Fragmentary cervical vertebra.

Referred material:

PIN 1043/537, 538, 540, 607, 608: Fragmentary orbitals.

PIN 1043/574, 615-617: Fragmentary maxillae.

PIN 1043/525: Articular part of the left ramus of the lower jaw.

PIN 1043/575-584, 636-639: Teeth.

PIN 1043/532, 609, 659: Spinous processes of anterior thoracic vertebrae.

PIN 1043/533, 621, 622: Spinous processes of posterior thoracic vertebrae.

PIN 1043/146-176: Thoracic vertebrae.

PIN 1043/660: Sacral vertebra.

PIN 1043/548-573, 631-634: Caudal vertebrae.

PIN 1043/517, 518, 625: Right tibia.