Magyarosaurus dacus
Magyarosaurus dacus was one of the smallest sauropods ever discovered. At roughly five to six metres long and around a tonne in weight, it was barely bigger than a horse or a large bull, even though it belonged to the titanosaurs, the same group that produced the heaviest land animals of all time.
Magyarosaurus
Magyarosaurus dacus
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Quick facts
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Weight
750–1100 kg
Length
5–6 m
Diet
Herbivore
Period
Cretaceous
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750–1100 kg
5–6 m
Cretaceous
Quadrupedal
1.4–2 m
Herbivore
7 recorded fossil finds in Romania. Most in Hunedoara and Alba. First described in 1915 by Nopcsa.
Sites and counts from the Paleobiology Database
The timeline shows the whole age of dinosaurs – and how much time has passed since. The glowing part is when Magyarosaurus lived.
million years ago
Lived 72–66 million years ago
If the whole age of dinosaurs were a single day, Magyarosaurus lived at 23:37.
Chapter • Meet the dinosaur
Magyarosaurus dacus was one of the smallest sauropods ever discovered. At roughly five to six metres long and around a tonne in weight, it was barely bigger than a horse or a large bull, even though it belonged to the titanosaurs, the same group that produced the heaviest land animals of all time. Its build was nonetheless thoroughly sauropod: a long but moderately proportioned neck, a barrel-shaped body carried on four pillar-like legs, and a tapering tail held clear of the ground. The skin bore small mosaic scales, and bony plates (osteoderms) recovered from the Hațeg Basin most likely belonged to Magyarosaurus or a close relative. The head was small, with blunt, peg-like teeth set at the front of the jaws.
Chapter • Where it lived
Magyarosaurus lived in the latest Cretaceous (Maastrichtian, about 72–66 million years ago) on one of the islands of the European archipelago along the northern margin of the Tethys Ocean. That landmass is known today as Hațeg Island and corresponds broadly to the Hațeg Basin of Transylvania, Romania. The fossils come mainly from the Sânpetru and Densuș-Ciula formations, at localities such as Sânpetru, Vălioara and Tuștea. The setting was a semi-arid to seasonally wet floodplain crossed by gravel- and sand-bearing rivers, with open glades, shrubland and stands of conifers, palm-like plants and early flowering plants. Dry spells alternated with heavy rains that flooded the plains and buried carcasses — one reason so much fossil material survives there.
Chapter • Family life
15–40
Chapter • Wild behavior
Cathemeral
At several Hațeg localities bones of more than one individual occur in the same horizon, which has been read as evidence that the animals at least sometimes moved in groups. The evidence is weak, however: such accumulations can equally result from rivers gathering remains that died at different times. No trackways or unambiguous bonebeds confirm herding in Magyarosaurus specifically, so group living remains a plausible but unproven hypothesis.
The name means roughly "Magyar lizard", while the species name dacus refers to Roman Dacia — modern Romania.
Magyarosaurus is the textbook example of island dwarfism in dinosaurs; it lived on what palaeontologists call Hațeg Island in the Tethys Sea.
Some of its titanosaur relatives, such as Argentinosaurus, weighed up to a hundred times more.
Franz Nopcsa, a Hungarian-Romanian aristocrat and pioneer of palaeobiology, was the first scientist to argue that islands can shrink large animals.
The first bones were collected on the family estate at Szentpéterfalva (Sânpetru) in the 1890s, traditionally credited to Nopcsa's sister Ilona.
A 2010 bone-histology study showed that the skeletons belonged to fully grown adults, not juveniles of a larger species as some researchers had suspected.
The genus received its current name only in 1932, when the German palaeontologist Friedrich von Huene re-examined Nopcsa's material.
Magyarosaurus fossils turn up in the same beds as the dwarf hadrosaur Telmatosaurus and the giant azhdarchid Hatzegopteryx — the latter a pterosaur, not a dinosaur.
Chapter • Scientific place
Journal of Systematic Palaeontology (Taylor & Francis)
Reviewed: 9/6/2026
Peer-reviewed systematic revision of the Romanian titanosaurs that re-evaluates the taxonomic status and phylogenetic placement of Magyarosaurus dacus within Titanosauria/Lithostrotia.
Open sourceHistorical Biology (Taylor & Francis)
Reviewed: 9/6/2026
Documents the Maastrichtian titanosaur material and its collecting localities and stratigraphic occurrence in the Hațeg Basin of Transylvania, Romania.
Open sourcePalaeogeography, Palaeoclimatology, Palaeoecology (Elsevier)
Reviewed: 9/6/2026
Reconstructs the seasonally dry to wet floodplain and river-channel palaeoenvironment of the Hațeg and Transylvanian basins in which Magyarosaurus lived.
Open sourceNatural History Museum, London
Reviewed: 9/6/2026
Museum taxon page classifying Magyarosaurus as a herbivorous (plant-eating) sauropod.
Open sourcePalaeogeography, Palaeoclimatology, Palaeoecology (Elsevier)
Reviewed: 9/6/2026
Extinct taxon; conservation status NE
Open sourceProceedings of the National Academy of Sciences (PNAS)
Reviewed: 9/6/2026
Peer-reviewed overview of Magyarosaurus dacus covering its anatomy, small adult body size and island dwarfism, used as the general description source.
Open sourceProceedings of the National Academy of Sciences (PNAS)
Reviewed: 9/6/2026
Peer-reviewed overview of Magyarosaurus dacus covering its anatomy, small adult body size and island dwarfism, used as the general description source.
Open sourceProceedings of the National Academy of Sciences (PNAS)
Reviewed: 9/6/2026
Peer-reviewed overview of Magyarosaurus dacus covering its anatomy, small adult body size and island dwarfism, used as the general description source.
Open sourceProceedings of the National Academy of Sciences (PNAS)
Reviewed: 9/6/2026
Peer-reviewed overview of Magyarosaurus dacus covering its anatomy, small adult body size and island dwarfism, used as the general description source.
Open source