animals with bilateral symmetry, at least as embryo
(Redirected from Bilateral)

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.

Temporal range: Ediacaran – Recent
Animal diversity October 2007.jpg
Diversity of bilaterians.
Scientific classification e
Kingdom: Animalia
Clade: ParaHoxozoa
Clade: Bilateria

Main subgroupsEdit

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

Related pagesEdit


  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