Temporal range: Early–Late Cretaceous, 130–65.5Ma Possible Early
Jurassic record |Reconstructed skeleton of Nothronychus
mckinleyi| Segnosauria Barsbold, 1980 Therizinosaurs (or
segnosaurs) are theropod dinosaurs belonging to the clade
Therizinosauria. Therizinosaur fossils have been found in Early
through Late Cretaceous deposits in Mongolia, the People's
Republic of China and Western North America. Various features of
the forelimbs, skull and pelvis unite them quite comfortably,
both as theropods and, as maniraptorans, close relatives to
birds. The name therizinosaur is derived from the Greek therizo
meaning 'to reap' or 'to cut off' and sauros meaning 'lizard'.
The older name segnosaur is derived from Latin segnis meaning
'slow' or 'sluggish' and Greek sauros meaning 'lizard'.
Therizinosaurs had a very distinctive, often confusing set of
characteristics. Their long necks, wide torsos, and hind feet
with four toes used in walking resembled prosauropod dinosaurs.
Their unique hip bones, which pointed backwar