animals with bilateral symmetry, at least as embryo

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
Diversity of bilaterians.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Clade: ParaHoxozoa
Clade: Bilateria

Main subgroups change

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

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References change

  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