- The
anamniotes are an
informal group of
craniates comprising all
fishes and amphibians,
which lay
their eggs in
aquatic environments. They are distinguished...
-
groups Image class Estimated number of
described species Group totals Anamniote lack
amniotic membrane so need to
reproduce in
water Jawless Fish Myxini...
- from the
posterior nephric ridge. The
functional embryonic kidney in
anamniotes is the pronephros. Kerr
coined the term ‘opisthonephros’ in 1919. In 1949...
-
transition from
aquatic to
terrestrial environments. Fish and
amphibians are
anamniotes, and lack the allantois. In
mammals the
extraembryonic membranes are known...
-
Threatened species in Red List Best
estimate of
percent of
threatened species Anamniotes lay eggs in
water Amphibians 8,707 8,020 92% 2,876 41%
Amniotes adapted...
- ἀμνίον (amníon) amniocentesis, amnion, amnioscope, amniote, amniotic,
anamniote amph-, amphi- both, on both
sides of, both
kinds Gr**** ἀμφί (amphí) "on...
- (non-amphibian tetrapods) have
cranial nerves similar to
those of humans. In
anamniotes (fishes and amphibians), the
accessory nerve (XI) and
hypoglossal nerve...
- ctenophora,
reptiles and amphibians. Some
vertebrates that are both
amniote or
anamniote,
including urodele amphibians,
cartilaginous fish,
birds and reptiles...
-
fertilized eggs
within the
mother (marsupial and
placental mammals),
unlike anamniotes (fish and amphibians) that have to
spawn in or
closely adjacent to aquatic...
- birds, and mammals.
Amphibians and fish lack the
amnion and thus are
anamniotes (non-amniotes). The
amnion stems from the extra-embryonic
somatic mesoderm...
