Genus: Stereosternum COPE, 1885
Etymology: Greek, stereos, “solid, firm”, Greek, sternon, “chest, breastbone”: Ridig chest.

Species: tumidum COPE, 1885
Etymology:

SZCZYGIELSKI, SURMIK, KAUPUSINSKA & ROTHSCHILD, 2017

Locality: Parana State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

Age: Kungurian State, Uppermost Rotilegendes Epoch, Middle Permian.

Material: Nearly complete skull and skeleton.

Note: Has congenital scoliosis on two dorsal vertebrae.

 

SZCZYGIELSKI, DROZDZ, SURMIK, KAPUSCINSKA & ROTHSCHILD, 2019

Locality: Brazil.

Horizon: Irati Formation.

Biostratigraphy:

Age: Kungurian State, Uppermost Rotilegendes Epoch, Middle Permian.

Material:

ZPAL R VII/1: Nearly complete specimen.

Note: With a palepathology: Congenital scoliosis caused by a hemivertebra,