Genus: Riojasaurus BONAPARTE, 1969
Etymology: In reference to the La Rioja Province, Argentina, and Greek, sauros, "lizard": “La Rioja Lizard”.
= Strenusaurus BONAPARTE, 1969
Etymology: Latin, sternuss “active, vigorous” and Greek, sauros, "lizard": “Vigorous lizard”.

Species: incertus BONAPARTE, 1969
Etymology: Latin, incertus, "uncertain."

Holotype: PVL. 3808

Locality: La Rioja Province, Argentina.

Horizon: Los Colorados Formation.

Biostratigraphy:

Age: Norian Stage, Upper Late Triasisc Epoch, Late Triassic.

Material: Skeleton, lacking skull.

Referred material:

PVL 3806: 2 dorsals? 3 sacrals, and 9 caudal vertebrae, fragmentary ilium, proximal end of a pubis, femora, tibia, fibulae, 3 incomplete metatarsals, right humerus, fragmentary costals and vertebrae.

PVL 3662: 13 incomplete vertebrae (cervical, dorsal and caudals), 1 scapula, 1 coracoid, right humerus, ilium, ischia, 1 fragmentary pube, 1 femur, distal end of tibia, 1 fibula and 1 metatarsal of a juvenile.

PVL 3815: 20 incomplete vertebrae, 2 scapulae, ilia (1 complete the other fragmentary), humeri, 1 femur, 1 complete tibia, and other fragmentary of a juvenile.

PVL. 3526: Both pubi with articulated ischia, phalanges, 4 vertebrae of the cervical-dorsal region, and 6 dorsal vertebrae.

PVL. 3805: 3 sacral and 2 caudal vertebrae, left ilium and femora.

PVL 3844: 5 cervical and 1 dorsal articulated vertebrae.

PVL 3845: Distal end of tibia and fibula with astragalus and calcaneum.

PVL 3846: Distal end of tibia and fibula with astragalus.

PVL 3467: Left ilium.

PVL 3472: Proximal end of left pubis.

PVL 3669: Left femur and left ilium.

PVL 3392: Ischia.

PVL 3668: Fragmentary scapula and coracoid, fragmentary humerus and proximal end of ulna.

PVL 3478: Proximal end of a humerus.

PVL 3533: Left ilium.

PVL 3393: 3 dorsal vertebrae, 3 incomplete sacrals, and 1 caudal vertebrae, fragmentary scapula and coracoid, 1 humerus, both pubae, tibiae and fibula, and distal end of femur.

PVL 3847: 2 fragments of a cranium and possible postfrontals.

BONAPARTE & PUMARES, 1995

ULR 56: Skull, dentary and nearly complete skeleton.

 

BOSSI & BONAPARTE, 1978

Locality: Austral border of the Marayes-El Carrixal basin, Eastern San Juan Basin, Argentina.

Horizon: Quebrada del Barro Formation.

Biostratigraphy:

Age: Norian Stage, Upper Late Triasisc Epoch, Late Triassic.

Material:

Number: Not given: Incomplete pes, astragalus, calcaneum, distal tarsals, metatarsals II, III, IV, and V, proximal metatarsus with 8 phalanges corresponding to digits I and IV, and 4 fragmentary caudal vertebrae.

 

= Strenusaurus procerus BONAPARTE, 1969
Etymology: Latin, procerus, "slim."

Holotype: PVL 3663

Locality: La Rioja Province, Argentina.

Horizon: Los Colorados Formation.

Biostratigraphy:

Age: Norian Stage, Upper Late Triasisc Epoch, Late Triassic.

Material: 7 posterior dorsal vertebrae, scapula and coracoid, ilium, pubis with fragmentary ischium, humerus, femur, fragmentary tibia and astragalus.