Magyarosaurus dacus, M. hungaricus, M. transsylvanicus


Name: Magyarosaurus dacus, M. hungaricus, M. transsylvanicus

Name Meaning: Magyar Reptile

First Described: 1932

Described By: von Huene

ClassificationDinosauria, Saurischia, Eusaurischia, Sauropodomorpha, Plateosauria, Massopoda, Sauropodiformes, Anchisauria, Sauropoda, Gravisauria, Eusauropoda, Neosauropoda, Macronaria, Titanosauriformes, Somphospondyli, Titanosauria

Magyarosaurus was a sauropod from the Hateg Basin in Romania, aka, the land of dinosaur island dwarfism that is quite famous - and Magyarosaurus is no exception. It lived in the Maastrichtian age of the Late Cretaceous, about 70 to 66 million years ago. It is known from multiple individuals and, due to island dwarfism, was the smallest titanosaur and one of the smallest sauropods, at only about 6 meters long and only about as tall as a person. So if for whatever reason you want a puppy sized sauropod as a pet, this is the closest you’re going to get. 


It is known from about 10 individuals, and perhaps more, and was preyed on by large pterosaurs such as Hatzegopteryx. The phenomenon of island dwarfism lead the adult individuals to retain a lot of juvenile characteristics, but the histology revealed these individuals to be adult ones, with a reduced growth rate and high metabolic rate. Still, I don’t blame previous scientists for having trouble believing in a world where this was possible: 

Source: Mark Witton

Osteoderms have been found associated with Magyarosaurus with strange in shape and size, and eggs have also been found that may be that of Magyarosaurus, with the Hateg Basin serving as a nesting place in the Late Cretaceous. One of the embryos preserved inside the egg shows evidence of armouring. It lived alongside many other dinosaurs such as Telmatosaurus, Struthiosaurus, Balaur, Bradycneme, Elopteryx, and Zalmoxes


Shout out goes to @chetos11!

The Magyar lizard, Magyarosaurus (1932)

Phylum : Chordata
Class : Reptilia
Order : Saurischia
Suborder : Sauropodomorpha
Infraorder : Sauropoda
Genus : Magyarosaurus
Species : M. dacus, M. hungaricus, M. transylvanicus

  • Late Cretaceous (70 Ma)
  • 6 m long and 1 000 kg (size)
  • Transylvanian basin , Romania and Germany(map)

Named after the Magyars–one of the ancient tribes that settled modern-day Hungary–Magyarosaurus is a striking example of what biologists call “insular dwarfism”: the tendency of animals confined to isolated ecosystems to grow to smaller sizes than their relatives elsewhere. Whereas most titanosaurs of the late Cretaceous period were truly enormous beasts (measuring anywhere from 50 to 100 feet long and weighing 15 to 100 tons), Magyarosaurus was a mere 20 feet long from head to tail and weighed one or two tons, tops. It’s possible that this elephant-sized titanosaur spent most of its time in low-lying swamps, dipping its head beneath the water to find tasty vegetation.

thefluffytheropod asked:

Which dinosaurs probably had osteoderms?

There are three groups of dinosaurs with osteoderms: ceratosaurs, titanosaurs, and thyreophorans. I’ll briefly elaborate on each.


Ceratosaurus had a row of pointed, triangular osteoderms down its midline (Gilmore, 1920). There were “large knob-like bumps” in the skin of Carnotaurus (Bonaparte, 1990; Czerkas, 1997), but they don’t appear to be skeletal and cannot be considered osteoderms proper.



Among the more derived titanosaurs, osteoderms may have been rather common. Deperet (1896) recorded the first instance of titanosaur osteoderms in “Titanosaurus” madagascarensis; this was followed by:

(Gonzalez Riga, 2003)

There has been some debate over exactly how titanosaur osteoderms articulated; we know, however, that most titanosaurs were lightly armoured (D’Emic et al., 2009). Proposed arrangements include osteoderms grouped over the pelvis to reinforce tail movement (Sanz et al., 1987), smaller dermal plates down the back with larger, spiky osteoderms near the shoulders (Le Loeuff et al., 1994), or rows parallel to the midline (Salgado, 2003). Vidal et al. (2014) support the lattermost interpretation for at least titanosaurs with osteoderms having distinct roots and bulbs.



I mean…. osteoderms are kind of a defining trait of this clade. Stegosaur plates, ankylosaur armour, and everything in between is all osteoderms.