Bilaterians facts for kids
Quick facts for kids BilateriaTemporal range: Ediacaran – Recent
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Bilateria
Hatschek, 1888
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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
- Deuterostomia
- Echinodermata (20,000 species, 7000 living)
- Chordata. mostly Vertebrata (63,000 species)
- Hemichordata
- Protostomia
- Ecdysozoa (6 to 20 million species)
- Nematoda (20,000 species known +many more)
- Arthropoda (one to 10 million species)
- Lophotrochozoa
- Annelida (17,000 species)
- Platyhelminthes (20,000+ species)
- Mollusca (85,000+ species)
- Brachiopoda (5,000 fossil species)
- Rhombozoa
- Platyzoa
- Minor phyla (like Chaetognatha)
- Ecdysozoa (6 to 20 million species)
Numbers are approximate; extinct species numbers cannot be known for most phyla.
Related pages
Images for kids
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Ikaria wariootia, living 571-539 million years ago is one of the oldest bilaterians identified
See also
In Spanish: Bilateria para niños
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Bilaterians Facts for Kids. Kiddle Encyclopedia.