-
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....
- "Haptodus"
garnettensis is an
extinct species of
basal sphenacodont from the Late
Carboniferous (Pennsylvanian) of Kansas, USA. The
holotype of "Haptodus"...
- moderately-sized,
lightly built carnivores,
intermediate in form
between basal sphenacodont "pelycosaurs" and more
advanced therapsids.
Biarmosuchians were rare...
-
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...
- primitive; they were the
least modified in
their jaw
apparatus from
their sphenacodont ancestry. The main
groups of non-mammalian
synapsids at Mikko's Phylogeny...
- the
skull and the teeth. The
sphenacodontoids evolved from
earlier sphenacodonts such as
Haptodus and
Ianthodon via a
number of
transitional stages of...
- 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...
- A
redescription of
sphenacodonts by
Michel Laurin (1993 and 1994),
revealed that it can't be ****igned to any
named sphenacodont genus.
Although its teeth...
