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ALECTROSAURUS

a carnivorous tyrannosauroid theropod dinosaur from the Late Cretaceous of Mongolia.
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Pronunciation: ah-LEK-tro-SOR-us
Meaning: Mateless lizard
Author/s: Gilmore (1933)
Synonyms: None known
First Discovery: Inner Mongolia, China
Chart Position: 132

Alectrosaurus olseni

When Charles Whitney Gilmore clapped eyes on Alectrosaurus in 1933, he immediately proclaimed it "a hitherto unknown theropod" simply on the strength of its unusually long upper arms and huge hand claws. As luck would have it, he was right, but the clawed forelimb on which he based his claim is actually the property of an as-yet unidentified member of Segnosauria, while Alectrosaurus is a smooth-snouted tyrannosauroid, though one teetering on the brink of Tyrannosauridae proper.
Mateless lizardEtymology
Alectrosaurus is derived from the Greek "alektros" (mateless, unmarried, or alone) and "sauros" (lizard). Confusion often stems from the similar Greek "alektor" (rooster) but Alectrosaurus was definately no "rooster lizard!"
The species epithet, olseni, is a nod to George Olsen (see below).
Discovery
The first fossils of Alectrosaurus were recovered from the Iren Dabasu Formation (also known as Iren nor which roughly translates as "colorful salt lake") of Nei Mongol Zizhiqu (Inner Mongolia), China, by George Olsen during the third AMNH expedition to Mongolia in 1923. The holotype (AMNH 6554) consists of a single hindlimb, proportionately weird for a "tyrant lizard"; the thigh, shin and foot were roughly the same length.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 84-71 mya
Stats:
Est. max. length: 5 meters
Est. max. hip height: 2 meters
Est. max. weight: 700 Kg
Diet: Carnivore
References
• C. W. Gilmore (1933) "On the dinosaurian fauna of the Iren Dabasu Formation". Bulletin of the American Museum of Natural History 68(2-3):23-78.
• B.J. Mader and R.L. Bradley (1989) "A redescription and revised diagnosis of the syntypes of the Mongolian tyrannosaur Alectrosaurus olseni".
• T.R. Holtz, jr. (2001) "The phylogeny and taxonomy of the Tyrannosauridae" in "Mesozoic Vertebrate Life". Editors: D.H. Tanke and K. Carpenter.
• P.J. Currie (2001) "Theropods from the Cretaceous of Mongolia" in Benton, Shishkin, Unwin and Kurochkin "The Age of Dinosaurs in Russia and Mongolia".
• T.R. Holtz, jr. (2004) "Tyrannosauroidea" in "The Dinosauria: 2nd Edition".
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To cite this page:
Atkinson, L. "ALECTROSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 25th Mar 2017.
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