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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

Bilateria are all animals having a bilaterally symmetrical animals, they have front and a back end, as well as an upside and downside.



  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
  2. Helfenbein, Kevin G. et al. 2004. The mitochondrial genome of Paraspadella gotoi is highly reduced and reveals that chaetognaths are a sister group to protostomes. Proceedings of the National Academy of Sciences of the United States of America 101(29), July 20 2004: 10639-10643
  3. Papillon, Daniel et al. 2004. Identification of chaetognaths as protostomes is supported by the analysis of their mitochondrial genome. Molecular Biology and Evolution 21(11), November 2004: 2122-2129

[[category:Groups of phyla