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Bilateria



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Bilateria
Temporal range: Ediacaran – Recent
Diversity of bilaterians.
Scientific classification

The Bilateria are animals which are bilaterally symmetrical. They have front and a back end, an upside and downside, and a left and right side. Most animals are bilateral.

Main subgroups

Numbers are approximate; extinct species numbers cannot be known for most phyla.

Related pages

References

  1. Erwin T.L. 1982. Tropical forests: their richness in Coleoptera and other arthropod species. Coleopterists Bulletin. 36, 74/5. See also Coevolution#Numbers of species