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Bilateria

all animals having a bilateral symmetry

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.

Bilateria
Temporal range: Ediacaran – Recent
Animal diversity October 2007.jpg
Diversity of bilaterians.
Scientific classification
Kingdom:
Subkingdom:
(unranked):
Bilateria

Hatschek, 1888

Main subgroupsEdit

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

Related pagesEdit

ReferencesEdit

  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