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- Bilateria
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Encyclopedic overview
Animals with bilateral symmetry as an embryo, i.e. having a left and a right side that are mirror images of each other. This also means they have a head and a tail (anterior-posterior axis) as well as a belly and a back (ventral-dorsal axis).
Excerpted from Wikipedia’s “Category:Bilaterians” article, available under the CC BY-SA 4.0 licence.