-
among most
bilaterians,
where the
sense organs and
central nerve ganglia become concentrated at the
front end of the animal.
Bilaterians constitute one...
-
symmetric and
significantly cephalised body plan, and the vast
majority of
bilaterians belong to two
large superphyla: the protostomes,
which includes organisms...
- the
difference in the neuraxis, or if an
invertebrate is a non-
bilaterian. A non-
bilaterian has no
anterior or
posterior surface for
example but can still...
-
front and back ends. All
known bilaterian animals are triploblastic, and all
known triploblastic animals are
bilaterian.
Living echinoderms (sea stars...
-
German ur- 'original') is the
hypothetical last
common ancestor of the
bilaterian clade, i.e., all
animals having a
bilateral symmetry. Its
appearance is...
-
important characteristic, and
forms the
morphological basis for
separating bilaterian animals into two
natural groupings: the
protostomes and deuterostomes...
-
practical purposes,
coelom characteristics have been used to
classify bilaterian animal phyla into
informal groups. The term
coelom derives from the Ancient...
-
monophyletic and
therefore continues to be used as such. The
original bilaterian is
hypothesized to be a
bottom dwelling worm with a
single body opening...
-
system consists of a
nerve net, a
diffuse network of
isolated cells. In
bilaterian animals,
which make up the
great majority of
existing species, the nervous...
-
accompanied or
facilitated other important evolutionary developments: the
bilaterian body plan, the coelom, and metamerism, in
which the body was
built of...
