- BY-lə-TEER-ee-ə) is a
large clade or
infrakingdom of
animals called bilaterians (/ˌbaɪləˈtɪəriən/ BY-lə-TEER-ee-ən),
characterized by
bilateral symmetry...
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symmetric and
significantly cephalised body plan, and the vast
majority of
bilaterians belong to two
large superphyla: the protostomes,
which includes organisms...
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German ur- 'original') is the
hypothetical last
common ancestor of the
bilaterian clade, i.e., all
animals having a
bilateral symmetry. Its
appearance is...
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accompanied or
facilitated other important evolutionary developments: the
bilaterian body plan, the coelom, and metamerism, in
which the body was
built of...
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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...
- ἑλμινθ-), helminth-,
meaning "worm") is a
phylum of
relatively simple bilaterian, unsegmented, soft-bodied
invertebrates commonly called flatworms or flat...
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Bilateria is an
extremely diverse group of
animals containing a vast
majority of its species,
largely due to the
enormous amount of arthropods. This article...
- A
chordate (/ˈkɔːrdeɪt/ KOR-dayt) is a
deuterostomal bilaterian animal belonging to the
phylum Chordata (/kɔːrˈdeɪtə/ kor-DAY-tə). All
chordates possess...
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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...
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practical purposes,
coelom characteristics have been used to
classify bilaterian animal phyla into
informal groups. The term
coelom derives from the Ancient...
