-
Permian dissorophoid Gerobatrachus hottoni is a
lissamphibian. If it is not, the
earliest known lissamphibians are
Triadobatrachus and
Czatkobatrachus from...
- (caecilians as lepospondyls, and
other lissamphibians as temnospondyls), the
lepospondyl hypothesis (
lissamphibians as lepospondyls), and the
newer hypothesis...
- or
lissamphibians.
There are
currently three major hypotheses on the
origins of
lissamphibians. In the
temnospondyl hypothesis (TH),
lissamphibians are...
- and
basal synapsids (predecessors of mammals). The
origin of
modern lissamphibians,
which first appeared during the
Early Tri****ic,
around 250 million...
-
phylogenetic analysis conducted about the same time
concluded that
lissamphibians first appeared about 330
million years ago and that the temnospondyl-origin...
-
grade (a
paraphyletic group),
ancestral to
living tetrapods such as
lissamphibians (modern amphibians) and
amniotes (reptiles, mammals, and kin). "Labyrinthodont"-grade...
- to
emerge from fishapods). However,
there is no
evidence of
lissamphibians or
lissamphibian-like
animals in the
fossil record at this time. The tetrapod...
-
convincing argument in
favor of the
temnospondyl origin of
lissamphibians. Seen in
lissamphibians and many
dissorophoid temnospondyls,
pedicellate teeth have...
- "lepospondyl hypothesis" of
modern amphibian origins proposes that
lissamphibians are
monophyletic (that is, they form
their own clade) and that they...
- make them more
closely related to
amniotes than to
lissamphibians. On the
other hand, if
lissamphibians are
descended from lepospondyls, then not only Lepospondyli...
