-
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 clades: 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...
- ἑλμινθ-), helminth-,
meaning "worm") is a
phylum of
relatively simple bilaterian, unsegmented, soft-bodied
invertebrates commonly called flatworms or flat...
-
important characteristic, and
forms the
morphological basis for
separating bilaterian animals into two
natural groupings: the
protostomes and deuterostomes...
-
Xenacoelomorpha (/ˌzɛnəˌsɛloʊˈmɔːrfə/) is a
small phylum of
bilaterian invertebrate animals,
consisting of two
sister groups:
xenoturbellids and acoelomorphs...
-
front and back ends. All
known bilaterian animals are triploblastic, and all
known triploblastic animals are
bilaterian.
Living echinoderms (sea stars...
-
accompanied or
facilitated other important evolutionary developments: the
bilaterian body plan, the coelom, and metamerism, in
which the body was
built of...
-
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...
