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Additional
ankylopollexia
English Wikipedia - The Free Encyclopedia
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Ankylopollexia
Ankylopollexia
is a
clade
of herbivorous
iguanodontian
dinosaurs
that lived from the
Late Jurassic
to
Late Cretaceous
in all continents. Some members include
Camptosaurus
,
Iguanodon
,
Ouranosaurus
, and the
hadrosaurids
or "duck-billed dinosaurs". The Ankylopollexia was named by
Paul Sereno
in
1986
to denote the group within the
Iguanodontia
that includes the
Camptosauridae
and the
Styracosterna
. The name means "stiff thumbs", referring to a possible
synapomorphy
, possessing a conical thumb spine. Ankylopollexians were generally large animals, and some (such as
Shantungosaurus
, which measured up to 50 ft (15 m) in length and weighed up to 8 tons) equaled the largest
carnivorous dinosaurs
in size.
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