Bilateria
From Wikipedia, the free encyclopedia
| Bilateria Temporal range: Ediacaran – Recent |
|
|---|---|
| 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.
Subgroups [change]
- Deuterostomia
- Echinodermata (20,000 species)
- Hemichordata (71 species)
- Chordata (63,000 species)
- Protostomia
- Ecdysozoa (6 to 30 million species) [1]
- Lophotrochozoa
- Platyzoa
- Chaetognatha (affiliation uncertain) [2][3]
- Cycliophora
- Mesozoa
References [change]
- ↑ 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
- ↑ 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
- ↑ 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
