In 1932,
Friedrich von Huene erected the genus
Magyarosaurus and assigned three species based on sauropod specimens recovered from the
Sânpetru Formation:
M. dacus (the
type species),
M. hungaricus and
M. transsylvanicus. However, subsequent analyses considered only
M. dacus as a valid species of
Magyarosaurus, with "
M."
transsylvanicus representing a
chimera and partially a junior synonym of
M. dacus, and with "
M."
hungaricus representing a distinct genus. In 2025, Díez Díaz and colleagues reassigned "
M."
hungaricus to a new genus
Petrustitan. The generic name is derived from
Ancient Greek words πέτρα (
pétra, "stone, rock"), referring to the origin of the holotype (rocky outcrops of the type locality, Sânpetru), and τιτάν (
tītā́n, "giant"), which is often used when naming
titanosaurian sauropods. Both the
paralectotype (left tibia) and
lectotype (left fibula) of
P. hungaricus are catalogued under the same specimen number,
NHMUK R.3853. Some material originally referred to this taxon were also given a separate genus name,
Uriash. == References ==