Tridentinosaurus antiquus (Leonardi 1959) represents one of the oldest reptile fossils and one of the very few skeletal remains of this geological age found in the Italian Alps. Most of the skeletal e
Sea anemones (Actiniaria) are among the rarest of recognized fossil organisms, even rarer than jellyfish. Here we demonstrate that the most abundant fossil in the Pennsylvanian Mazon Creek Lagerstätte
A: degree of articulation; 4 = skull and lower jaw articulated with the vertebrae; 3 = skull articulated with the lower jaw, 2 = dentary articulated with the other bones of the lower jaw (articular co