-
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...
-
German ur- 'original') is the
hypothetical last
common ancestor of the
bilaterian clade, i.e., all
animals having a
bilateral symmetry. Its
appearance is...
-
wariootia is an
early example of a wormlike, 2–7 mm-long (0.1–0.3 in)
bilaterian organism. Its
fossils are
found in
rocks of the
Ediacara Member of South...
-
important characteristic, and
forms the
morphological basis for
separating bilaterian animals into two
natural groupings: the
protostomes and deuterostomes...
-
front and back ends. All
known bilaterian animals are triploblastic, and all
known triploblastic animals are
bilaterian.
Living echinoderms (sea stars...
-
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...
-
practical purposes,
coelom characteristics have been used to
classify bilaterian animal phyla into
informal groups. The term
coelom derives from the Ancient...
-
Xenacoelomorpha (/ˌzɛnəˌsɛloʊˈmɔːrfə/) is a
small phylum of
bilaterian invertebrate animals,
consisting of two
sister groups:
xenoturbellids and acoelomorphs...
