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Amniotes are
tetrapod vertebrate animals belonging to the
clade Amniota, a
large group that
comprises the vast
majority of
living terrestrial and semiaquatic...
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outside of the
clade Amniota,
though some
recent research has
recovered them as the
sister group to the
traditional Synapsida within Amniota,
based on inner...
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Reptiliomorpha (meaning reptile-shaped; in
PhyloCode known as Pan-
Amniota) is a
clade containing the
amniotes and
those tetrapods that
share a more recent...
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Araeoscelidia as
sister groups that
split off
before the
formation of
crown amniota (synapsids and sauropsids). The same
study also
considers parareptiles...
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their extinct relatives. It is one of the two
major clades of the
group Amniota, the
other being the more
diverse group Sauropsida (which
includes all...
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enclosed in a uterus. The
amnion is a
feature of the
vertebrate clade Amniota,
which includes reptiles, birds, and mammals.
Amphibians and fish lack...
- reptiles. Notably, this
appears to be the
ancestral tooth condition in
Amniota. This
morphology was once used as a
basis for the now-defunct taxonomic...
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together with
Sauropsida (reptiles and birds),
constitutes the
larger Amniota clade.
Early synapsids are
referred to as "pelycosaurs." The more advanced...
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amphibian and
primitive reptilian features, and its
placement relative to
Amniota has
significant implications regarding the
origins of the
first amniotes...
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considered to be
either related or
ancestral to
modern amphibians or to
Amniota (the
clade containing reptiles and mammals). It has been
suggested that...
