Named By: Jose Fernando Bonaparte - 1999.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Sauropodomorpha, Sauropoda.
Species: L. sauropoides (type).
Size: About 9.1 meters long.
Known locations: Argentina, La Rioja Province - Los Colorados Formation.
Time period: Norian of the Triassic.
Fossil representation: Vertebrae from a partially articulated spine.
was named in honour of the Don Lessem, an author noted for his work
writing popular science books. Although Lessemsaurus
is so far only
based upon the description of vertebrae. These vertebrae are noted
for having tall neural spines, something which may hint at a fleshy
or fatty ridge than ran down the back of the living dinosaur. Being
estimated at around nine meters long, Lessemsaurus
was not far from
the prosauropod Riojasaurus
in terms of overall size.
Aside from Riojasaurus, other dinosaurs from the Los Colorados Formation that Lessemsaurus may have come into contact with include the massospondylid Coloradisaurus, and the theropod Zupaysaurus.
- Evolución de las vértebras presacras en Sauropodomorpha, Jose Fernando Bonaparte - 1999.
-New information on Lessemsaurus sauropoides (Dinosauria: Sauropodomorpha) from the Upper Triassic of Argentina, D. Pol & J. E. Powell - 2007.