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Additional
Sphenacodontia
English Wikipedia - The Free Encyclopedia
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Sphenacodontia
Sphenacodontia
is a
stem-based
clade
of derived
synapsids
. It was defined by Amson and Laurin (2011) as "the largest clade that includes
Haptodus baylei
,
Haptodus garnettensis
and
Sphenacodon ferox
, but not
Edaphosaurus pogonias
". They first appear during the
Late Pennsylvanian
epoch.
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