Marasuchus is a genus of dinosaur-like ornithodiran from the middle Triassic Period of Argentina. The species Marasuchus illoensis was originally described as a second species of Lagosuchus, L. lilloensis. However, in a restudy of Lagosuchus by Sereno and Arcucci (1994), the authors concluded that the original (type) specimen was too poorly preserved to allow any further specimens to be assigned to the genus. They also noted that the L. lilloensis specimen had limb proportions different from the type species. On this basis, they assigned L. lilloensis to a new genus, Marasuchus.


Pseudolagosuchus (meaning "false Lagosuchus") is a genus of dinosauromorph from the Middle Triassic. It was a small reptile which was probably about one meter long, 30 centimeters (1 ft) tall, and weighed approximately 2 kilograms (5 lb). It lived in what is now Argentina. Pseudolagosuchus is known only from a pubis, a femur, a tibia, and vertebrae.


Silesaurus is a genus of dinosauriform from the Late Triassic, approximately 230 million years ago in the Carnian faunal stage of what is now Poland.

Fossilized remains of Silesaurus have been found in the Keuper Claystone of Opole, Silesia, Poland, which is also the origin of its name.[1] The type species, Silesaurus opolensis, was described by Jerzy Dzik in 2003. It is known from some 20 skeletons, making it one of the best-represented of the early dinosaurs and related animals.

Silesaurus measured approximately 2.3 meters long (7.5 ft), and was facultatively bipedal. It was light and built for speed.

Silesaurus was a herbivore. The teeth were small, conical, and serrated. The tip of the dentary has no teeth, and some paleontologists think that it may have been covered by a beak.


Some scientists think that Silesaurus was not a dinosaur, but rather a dinosauriform. Mikoluszko points out dinosaur features lacking in Silesaurus, including an enlarged deltopectoral crest, and epiphyses on the cervical vertebrae.

However, Silesaurus has some dinosaurian characteristics as well:

a brevis shelf
ischium with a slender shaft
femur with a reducted tuberosity that borders the ligament of the femoral head
a prominent lesser trochanter
an overlap of the ascending process of the astralagus with the tibia
a concave proximal articular surface for the reception of the distal end of the fibula on the calcaneum
As a result, alternative theories place Silesaurus at or near the base of the ornithischian dinosaurs. Other scientists propose a basal link between the prosauropods and ornithischians.

Silesaurus oploensis.


Мне лично пока не совсем понятно, чем силенозавр не динозавр.