Description
Based on the known fossil elements from a partial skeleton, Pisanosaurus was a small, lightly built dinosaur approximately 1 m (3 ft 3 in) in length. Its weight was between 2.27–9.1 kg (5–20 lb). These estimates vary due to the incompleteness of the holotype specimen PVL 2577. This specimen consists of a partial skull with a fragmentary right maxilla, the right lower jaw, six cervical vertebrae, seven dorsal vertebrae, a fragmentary scapula, a coracoid, molds of five sacral vertebrae, fragmentary ilium, ischium and pubis, an impression of 3 metacarpals, complete femora, tibia, fibula, astragalus, calcaneum, metatarsals III and IV, three phalanges from metatarsal III and four metatarsals and the ungual from metatarsal IV. The orientation of the pubis is uncertain, with some skeletal reconstructions having it projecting down and forward (the propubic condition) similar to that of the majority of saurischian dinosaurs. The tail of Pisanosaurus has been reconstructed as being as long as the rest of the body, based on other early ornithischians, but as a tail has not been recovered, this is speculative. It was bipedal and, like all other known ornithischians, was probably herbivorous.
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