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Clade
Subclade

Taxon
Taxon
Therizinosauroidea
Nominal Author
Maleev 1954
2nd Nominal Author
Russell and Dong 1993
Taxon Status ACTIVE
Comments

Zhang et al. (2001) were first to define Therizinosauroidea. The stem-based definition overlaps with that given previously for Therizinosauria by Russell (1997). Russell’s Therizinosauria has precedence and also may be the better stem-based taxon to encompass the entire clade of specialized theropods (see Therizinosauria).

Clark et al. (2004), in contrast, proposed a node-based definition for Therizinosauroidea, which is followed here. Inclusion of the basal therizinosaurian Falcarius from western North America currently differentiates Therizinosauria from the less inclusive Therizinosauroidea. The active definition is a first-order revision of that in Clark et al. (2004) that uses species as specifiers.

Potential Synonomy
Therizinosauria

Active Phylogenetic Definition
Active Definition
The least inclusive clade containing Therizinosaurus cheloniformis Maleev 1954 and Beipiaosaurus inexpectus Xu et al. 1999.
Shorthand
< Therizinosaurus cheloniformis and Beipiaosaurus inexpectus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type NODE
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Therizinosaurus cheloniformis
Specifier(s) B
Beipiaosaurus inexpectus
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
2004

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All coelurosaurs closer to Therizinosaurus than to either Ornithomimus, Oviraptor, Velociraptor, or Neornithes.
Latest Record
Zhang et al. 2001:284
Range (My)
Range (My)
Therizinosaurus, Ornithomimus, Oviraptor, Velociraptor, Neornithes
Range (My)

Definitional History #2
Earliest Record
The least inclusive clade containing Therizinosaurus and Beipiaosaurus.
Latest Record
Clark et al. 2004:153
Range (My)
Range (My)
Therizinosaurus, Beipiaosaurus
Range (My)

Definitional History #3
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Definitional History #10
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