Dinopedia
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Troodontidae
Temporal range: Late Jurassic – Late Cretaceous
Troodontids
Several species of troodontids
Scientific classification
Kingdom: Animalia
Phylum: Chordata
clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Troodontidae
Gilmore, 1924
Type species
Troodon formosus
Leidy, 1856
Subgroups
Synonyms
  • Elopterygidae? Lambrecht, 1933
  • Saurornithoididae Barsbold, 1974
  • Archaeornithoididae? Elzanowski & Wellnhofer, 1992

Close relatives of the dromaeosaurids, the dinosaurs in Troodontidae make up the other group of deinonychosaurs. Named after the now dubious Troodon, they are possibly one of the most intelligent theropods, with the exact intellect still being determined to this day. Fossils are currently known from North America, Asia and Europe. Due to the fragmentary nature of most troodontids, anatomy and intelligence is hard to interpret.

Time Period[]

These dinosaurs lived from the mid Jurassic to the end of the Cretaceous, and the mass extinction at said period's end.

Classification[]

There are multiple possibilities of the genera included in Troodontidae as well as how they are related. Very primitive species, such as Anchiornis huxleyi, have alternately been found to be early troodontids or early members of the closely related group Avilalae by various studies.

The cladogram below follows the results of a study by Pascal Godefroit and colleagues in 2013.


Eosinopteryx



Eumaniraptora

Dromaeosauridae


Averaptora
Avialae

Aurornis




Anchiornis




Archaeopteryx




Xiaotingia



Other avialans






Troodontidae

Jinfengopteryx




Mei




Sinovenator




Sinusonasus




Byronosaurus




Sinornithoides




Troodon



Saurornithoides



Zanabazar



Geminiraptor












In 2014, Brusatte, Lloyd, Wang and Norell published an analysis on Coelurosauria, a simplified version shown below. This analysis included more troodontid species but failed to resolve many of their interrelationships, resulting in large "polytomies" (sets of species where the branching order in the family tree is uncertain).

Paraves

Dromaeosauridae



Avialae


Troodontidae


Aurornis



Eosinopteryx



Xiaotingia



Anchiornis




Jinfengopteryginae

IGM 100/1323




IGM 100/1126



Jinfengopteryx





Sinovenator



Mei



EK Troodontid



Byronosaurus



Xixiasaurus



Sinornithoides




Troodon




Saurornithoides



Zanabazar







In 2017, Aaron van der Reest and Phil Currie published a new genus and species, Latenivenatrix mcmasterae, and they coined the subfamily Troodontinae, defined as the group of troodontids descended from the last common ancestor of Gobivenator mongoliensis and Zanabazar junior.

Troodontidae

Sinovenator




Anchiornis




Mei



Talos




Byronosaurus




MPC-D 100/44



Sinornithoides


Troodontinae


Urbacodon



Gobivenator






Latenivenatrix




Philovenator



Linhevenator






Two medicine troodontid




Saurornithoides



Zanabazar











Gallery[]

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