-
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...
-
Comparison of "pelycosaurian" skulls: 1
sphenacodont, 2 ophiacodont, 3 caseid. The
quadratojugale is green,
squamosale is red,
jugale is blue....
- moderately-sized,
lightly built carnivores,
intermediate in form
between basal sphenacodont "pelycosaurs" and more
advanced therapsids.
Biarmosuchians were rare...
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Haptodus is an
extinct genus of
basal sphenacodont,
member of the
clade that
includes therapsids and hence, mammals. It was at
least 1.5
metres (5 ft)...
-
process in the humeri.
Ianthodon was
identified as the
basalmost known sphenacodont. It can be
distinguished from
Haptodus by its
narrower skull and dentition...
- "Haptodus"
garnettensis is an
extinct species of
basal sphenacodont from the Late
Carboniferous (Pennsylvanian) of Kansas, USA. The
holotype of "Haptodus"...
-
whiskers unlikely.
Therapsids evolved from a
group of
pelycosaurs called sphenacodonts.
Therapsids became the
dominant land
animals in the
Middle Permian,...
- to be more
primitive than
other sphenacodonts like Dimetrodon. They
thought varanopids and Dimetrodon-like
sphenacodonts were
closely related because both...
-
Hypselohaptodus is a
genus of
sphenacodont synapsid from the
Cisuralian of England. It
contains a
single species,
Hypselohaptodus grandis, and is known...
-
outdated terms rarely used in
modern literature.
Therapsids descended from
sphenacodonts, a
primitive synapsid, in the
middle Permian, and took over from them...
