A juvenile stegosaurian dinosaur, “ Astrodon pusillus ,” from the Upper Jurassic of Portugal, with comments on Upper Jurassic and Lower Cretaceous biogeography

The holotype of the small sauropod dinosaur Astrodon pusillus Lapparent and Zbyszewski, 1957, from the Kimmeridgian (Upper Jurassic) of Portugal is shown to be the remains of a juvenile individual of the stegosaur Dacentrurus. The records of Astrodon from the Upper Jurassic of North America and the Lower Cretaceous of Africa are based on material of juvenile sauropods. However, teeth from the Lower Cretaceous of Portugal are correctly referred to Astrodon as A. valdensis (Lydekker). A review is presented of the intercontinental genera that the Late Jurassic and Early Cretaceous faunas of Western Europe shared with faunas of corresponding ages in North America and Africa.