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| Parent key: Animalia
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| Phyla
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| Cnidaria
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| Key: Cnidaria
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| Cnidaria
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| {{{6}}}
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Key to Cnidaria
| Animalia keys
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| Subkingdom
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| Agnotozoa
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| Phyla
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| Acoelomorpha | Cnidaria | Ctenophora | Myxozoa | Orthonectida | Placozoa | Porifera | Rhombozoa
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| Superphylum:Deuterostomia
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| Chaetognatha | Chordata | Echinodermata | Hemichordata
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| Superphylum:Ecdysozoa
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| Arthropoda | Kinorhyncha | Loricifera | Nematoda | Nematomorpha | Onychophora | Priapulida | Tardigrada
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| Superphylum:Lophotrochozoa
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| Annelida | Brachiopoda | Ectoprocta | Entoprocta | Mollusca | Nemertea | Phoronida | Sipuncula
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| Superphylum:Platyzoa
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| Acanthocephala | Cycliophora | Gastrotricha | Gnathostomulida | Micrognathozoa | Platyhelminthes | Rotifera
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- 1: Medusa stage present.
- 2: Medusa stage absent.
1: Medusozoa
incomplete
Cubozoa
Hydrozoa
Polypodiozoa
Scyphozoa
Staurozoa
2
- 3: Parasitic
- 4: Non-parasitic. Corals and sea anemonies.
3
incomplete
4
- Hexacorallia: Polyps have 6-fold symmetry
- Octocorallia: Polyps have 8-fold symmetry
5