-
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...
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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...
- "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,...
- bulbous-crowned
Haptodus to
which it was
closely related. Like
other sphenacodonts,
Ianthodon has a tall
lacrimal bone, and so
would have had a proportionally...
- to be more
primitive than
other sphenacodonts like Dimetrodon. They
thought varanopids and Dimetrodon-like
sphenacodonts were
closely related because both...
- the
skull and the teeth. The
sphenacodontoids evolved from
earlier sphenacodonts such as
Haptodus and
Ianthodon via a
number of
transitional stages of...
- to a 2020 study, it
should be
classified as a
primitive non-therapsid
sphenacodont rather than a
genuine basal therapsid.
Tetraceratops is
known from a...
-
Pantelosaurus (meaning "complete lizard") is an
extinct genus of
basal sphenacodonts known from the
Early Permian period (****elian stage) of Saxony, Germany...
