- (/ˌbaɪləˈtɪəriə/) is a
large clade or
infrakingdom of
animals called bilaterians,
characterized by
bilateral symmetry (i.e.
having a left and a right...
-
German ur- 'original') is the
hypothetical last
common ancestor of the
bilaterian clade, i.e., all
animals having a
bilateral symmetry. Its
appearance is...
-
accompanied or
facilitated other important evolutionary developments: the
bilaterian body plan, the coelom, and metamerism, in
which the body was
built of...
-
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...
-
opening (in Ctenophora, Cnidaria, and flatworms) or two
openings (in most
bilaterians).
Nearly all
animals make use of some form of ****ual reproduction. They...
-
although some fish
species have
pharyngeal teeth instead of oral teeth. Most
bilaterian phyla,
including arthropods,
molluscs and chordates, have a two-opening...
-
practical purposes,
coelom characteristics have been used to
classify bilaterian animal phyla into
informal groups. The term
coelom derives from the Ancient...
-
Acoela resemble the
planula larvae of some Cnidaria,
which exhibit some
bilaterian symmetry. They are vermiform, just as the
cnidarian Buddenbrockia is....
-
front and back ends. All
known bilaterian animals are triploblastic, and all
known triploblastic animals are
bilaterian.
Living echinoderms (sea stars...
-
Xenacoelomorpha (/ˌzɛnəˌsɛloʊˈmɔːrfə/) is a
small phylum of
bilaterian invertebrate animals,
consisting of two
sister groups:
xenoturbellids and acoelomorphs...
