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Temporal range: Ediacaran – Recent
A terrestrial flatworm (Terricola) from
the Sulawesi rainforest in Indonesia.
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
(unranked): Bilateria
Hatschek, 1888

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[change | change source]

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

Related pages[change | change source]

References[change | change source]

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