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

Species: tumidum COPE, 1885
Etymology:
= Mesosaurus tumidum (COPE, 1885)

Holotype:

Locality: Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material: Posterior part of a skeleton.

Referred material:

BORGOMANERO & LEONARDI 1979

Locality: Near Assistencia, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Number: Not given: Skull and nearly complete skeleton.

 

GEINITZ

Locality: Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Number: Not given: Fragmentary skull and skeleton.

Number: Not given: Skull and skeleton.

ROSSMANN & MAISCH, 1999

BSP 1997 I 68, 1988 I 39, 1982 I 27: 3 specimens in various degrees of preservation.

 

MEZZALIRA, 1989

Locality: Monte Cristo, Itapetiniga e Guarei, Municipio de Guarei, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Number: Not given:

 

Locality: Pedreira Fertical, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Number: Not given:

 


MODESTO, 1999

Locality: Unknown, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Modifed from MODESTO, 1999.

BHM (formerly BHI) 999: Nearly complete specimen.

AMNH 11009: Nearly complete specimen.

 

PICKFORD, 1996/OELOFSEN & AURAJO, 1987

Locality: Namibia.

Horizon:

Biostratigraphy:

Age: Early Permian.

Material:

Number: Not given:

 

ROSSMAN, 2000

Locality: Sao Paulo State, South Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

SMF-R-407: Fragmentary skeleton.

SMF-R-4470: Fragmentary skeleton.

SMF-R-4473: Fragmentary skeleton.

SMF-R-4477: Fragmentary skeleton.

SMF-R-4480a and b: 2 specimens, skull and skeleton.

SMF-R-4482: Fragmentary skeleton.

SMF-R-4487: Fragmentary skeleton.

SMF-R-4489: Fragmentary skeleton.

SMF-R-4490: Fragmentary skeleton.

SMF-R-4493: Fragmentary skeleton.

SMF-R-4495: Fragmentary skeleton.

SMF-R-4497: Fragmentary skeleton.

SMF-R-4498: Fragmentary skeleton.

SMF-R-4512: Skull and skeleton.

SMF-R-4513 a and b: 2 specimens, skull and skeleton.

SMF-R-4710: Skull and skeleton.

SMF-R-4935: Skull and skeleton.

SIGNORE, RAJA & BARGERA, 2002

Universita di Napoli “Federico II”: A juvenile and subadult to adult specimens.

 

Locality: 400 km south of Sao Paulo State, South Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

SMF-R-4471: Fragmentary skeleton.

SMF-R-4478: Fragmentary skeleton.

SMF-R-4484: Fragmentary skeleton.

SMF-R-4485 a and b: 2 specimens, skull and skeleton.

 

ROSSMANN, 2002

Locality: Unknown, Brazil.

Horizon:

Biostratigraphy:

Age: Early Permian.

Material:

PIMUZ A/III 0801: Nearly complete specimen.

 


ROSSMAN & MAISCH, 1999

Locality: Itapetiniqua, Parana State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

BSP 1879 I 37: Nearly complete specimen.

 

Locality: 50 km south of Juazerio do North, Ceara State, North Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

BSP 1875 I 165: Fragmentary skull and skeleton.

 

Locality: Arsiteneia, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

BSP 1966 I 190: Fragmentary skull and skeleton.

 

Locality: Pirasicaba, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

BSP 1962 I 165: Fragmentry skeleton.

 

ROSLER & TATIZANA, 1985

Locality: Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

GP.2T 1: Fragmentary skeleton.

A second fragmentary skeleton.

Note: 3 types of different body dermal tissues, each in a different body region: 1- the swimming web with rays parallel to the phalanges, 2-the polygonal scaly integument of the hind limbs, and 3-the darker integument covering the tail, in which detailed structures are not observed.

 

SOARES, 2003

Locality: Rio Claro, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

PV0170P, PV-171P, PV0172P, PV0174P, PV0175P, PVO176P, PV0180P, PV0181P, DGM542-R, PV0345P: Articulated specimens.

 

WOODWARD 1897

Locality: Near Limeira, Sao Paulo State, Brazil.

Horizon: Irati Formation.

Biostratigraphy:

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

Material:

Skull and skeleton.

BMNH R 538: Detached tail.

Fragmentary detached maxilla.