Pronunciation: AHM-to-SOR-us Meaning: Amtgai lizard Author/s: Kurzanov and Tumanova (1978) Synonyms: None known First Discovery: Ömnögovi, Mongolia Chart Position: 207
Known only from part of a braincase from southerm Mongolia, Amtosaurus was initially thought to be an ankylosaurid, then a duck-billed hadrosaurid, though Jolyon Parish and Paul Barrett reckon its remains are too scant to classify as anything more than an indeterminate ornithischian. Funnily enough, better fossils from Uzbekistan were assigned here as a second species—Amtosaurus archibaldi—and they turned out to be the property of a valid ankylosaur. Unfortunately, it wasn't Amtosaurus, as Parish and Barrett renamed it Bissektipelta in 2004.
(Great Amtgai Lizard) EtymologyAmtosaurus is derived from "Amtgai" (the site where it was discovered), and the Greek "sauros" (lizard). The species epithet, magnus, means "Great" in Latin.
DiscoveryThe remains of Amtosaurus were discovered at the Amtgay locality ("Amtgai Khuduk") in the Bayanshiree Formation, Ömnögovi Province, Mongolia.
The holotype (PIN 3780/2) is a partial braincase.