ERA: Late Jurassic ( Tithonian 150.7 – 144.2 Ma ).
SIZE: Length 0.6 m (2 ft).
FOSSILS: Isolated skull elements of 3 individuals, scute s.
COMMENTS: Echinodon was smaller than Fabrosaurus with a shorter head and fewer front teeth. The teeth were relatively large, with 2 of them long and sharp. It had dermal scales. For a long time this was considered a basal thyreophoran , and not everyone agrees with its placement in Heterodontosauridae by Sereno in 1991.
E. becklesii Owen, 1861 (type) .
REFERENCES for ECHINODON
Monograph on the fossil Reptilia of the Wealden and Purbeck Formations. Pt. V. Lacertilia.
PALAEONTOGR. SOC. MONOGR. 12; 31-39 (1861).
Lesothosaurus, ‘fabrosaurids,’ and the early evolution of Ornithischia.
JOURNAL OF VERTEBRATE PALEONTOLOGY 11(2); 168-197 (1991).