Sauropods were gigantic descendants of surprisingly small ancestors. Basal dinosauriformes, such as "Pseudolagosuchus" and "Marasuchus" from the Middle Triassic of Argentina, weighed approximately or less. These evolved into saurischia, which saw a rapid increase of bauplan size, although more primitive members like "Eoraptor", "Panphagia", "Pantydraco", "Saturnalia" and "Guaibasaurus" still retained a moderate size, possibly under . Even with these small, primitive forms, there is a notable size increase among sauropodomorphs, although scanty remains of this period make interpretation conjectural. There is one definite example of a small derived sauropodomorph: "Anchisaurus", under , even though it is closer to the sauropods than "Plateosaurus" and "Riojasaurus", which were upwards of in weight.