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Bilateria
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Bilateria is a large clade of animals characterised by bilateral symmetry during embryonic development. This means their body plans are laid around a longitudinal axis with a front and a rear end, as
Bilateria
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Centroneuralia
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Centroneuralia is a proposed clade of animals with bilateral symmetry as an embryo, consisting of the Chordata and Protostomia, united by the presence of a central nervous system. An alternative to th
Centroneuralia