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What is Therizinosauria?

Pronunciation: ther-ih-ZEEN-oh-SOR-ee-uh
Author: Russell
Year: 1997
Meaning: Scythe lizards (see etymology)
Locomotion: Bipedal (2 legs)
Synonyms: Segnosauria (Barsbold, 1980)
Segnosaurischia (Dong, 1987)
Definition
The most inclusive clade containing Therizinosaurus cheloniformis but not Tyrannosaurus rex, Ornithomimus edmontonicus, Mononykus olecranus, Oviraptor philoceratops and Troodon formosus. (Zanno et al. 2009)
About
Therizinosaurs (members of Therizinosauria) are a strange-looking bunch who have caused nothing but headaches, from a classification viewpoint. They have a backward facing pubis like ornithischians, a long neck, small head, small teeth, and four-toed hind feet like non sauropod sauropodomorphs (prosauropods), huge hand claws suggestive of the primarily carnivorous branch of saurischian dinosaurs known as theropods, and have, unsurprisingly, been plonked in all three groups by various experts since their remains were first discovered over 60 years ago. They have some weird features all of their own too, like wide, flared out hips to support a huge pot belly, but the presence of a specialized half-moon shaped bone (the semi-lunate carpal), which affords the wrist increased mobility, betrays their true identity. Therizinosaurs are maniraptoran theropods, but maniraptorans with a difference; they were too fat to run and mostly hunted plants, which is why they're known informally as "sloth dinosaurs".
Etymology
Therizinosauria is derived from the Greek "therizo" (to reap or cut with a scythe), "sauros" (lizard), and "-ia" (neuter plural), named for a group of mostly herbivorous (or possibly omnivorous) dinosaurs with long, scythe-shaped hand claws.
Relationships
References
Lindsay E. Zanno (2010) "A taxonomic and phylogenetic re-evaluation of Therizinosauria (Dinosauria: Maniraptora)".
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To cite this page:
Atkinson, L. "DinoChecker FAQ entry :: What is Therizinosauria?"
http://www.dinochecker.com/dinosaurfaqs/what-is-therizinosauria›. Web access: 24th Nov 2017.
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