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Yezosaurus was first thought to be a dinosaur, but later scientists realized it was actually a mosasaur, a type of marine reptile.1
The name Yezosaurus comes from Yezo, the name of a group of rocks in Japan where the fossil was found.1
The fossil of Yezosaurus was discovered in a floating concretion, a hard lump of rock, on a riverbank in Hokkaido, Japan, in 1976.1
Yezosaurus was originally called a tyrannosaur, but it is now considered a species of Taniwhasaurus, a mosasaur.1
The Japanese government declared the Yezosaurus fossil a national treasure in 1976, even before it was officially named.1

Yezosaurus: gehien egindako galderak
?Was Yezosaurus a dinosaur?
No, Yezosaurus was originally thought to be a dinosaur, but scientists now know it was actually a mosasaur, a type of extinct marine lizard.14
?How big was Yezosaurus?
Yezosaurus was a medium sized mosasaur. The related Taniwhasaurus reached about 6.7 meters (22 feet) long, and Yezosaurus was probably a similar size.3
?Where was Yezosaurus found?
The only Yezosaurus fossil was found in a floating concretion on a riverbank in Hokkaido, Japan, in 1976.14
?When did Yezosaurus live?
Yezosaurus lived during the Late Cretaceous period, about 85 to 72 million years ago.4
?Could Yezosaurus swim?
Yes, Yezosaurus was a marine reptile that swam using its powerful tail and paddle-like limbs, just like other mosasaurs.3
Mito-hauslea
Mitoa: Yezosaurus was a dinosaur.
Egia: Yezosaurus was actually a mosasaur, a marine reptile, not a dinosaur.1
Dino adituentzat
- Izen zientifikoa
- Yezosaurus
- Izendatzailea:
- Muramoto and Obata 19774
- Taldea
- Tiranosauroak
- Familia / klada
- Tyrannosauridae4
- Sailkapena
- Theropoda > Tyrannosauroidea > Tyrannosauridae4
- Arroken adina
- 86 eta 72 milioi urte artean (Santonian / Campanian)4
- Arroka-formazioak
- Kashima4
- Herrialdeak
- Japonia4
- Fosil-erregistroak
- 1 The Paleobiology Database datu-basean4
- Aurkikuntza
- Yezosaurus was named by Kikuwo Muramoto and Ikuwo Obata in 1977, based on a partial skull found in Hokkaido, Japan.41
- Oraindik eztabaidagai
- Scientists are still debating whether Yezosaurus mikasaensis is a distinct species or just an indeterminate species of Taniwhasaurus.1
Datuak nondik datozen
- Taniwhasaurus (en.wikipedia.org)
- PBDB Taxon (paleobiodb.org)
- Taniwhasaurus (Wikipedia) (Wikipedia)
- Yezosaurus in The Paleobiology Database (CC BY 4.0): adina, tokiak, arroka-formazioak, sailkapena.
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