Eleutherozoa
Eleutherozoa | ||||||||||||
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Sea Urchin ( Prionocidaris hawaiiensis ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Eleutherozoa | ||||||||||||
Bather , 1900 |
The Eleutherozoa are a sub-tribe of echinoderms . They essentially comprise freely moving, non- sessile species. The mouth and anus are on opposite sides of the body, with the mouth facing the substrate. They are compared to the pelmatozoa (Pelmatozoa), consisting of the fixed sea lilies and the freely moving hair stars .
A distinction is made between the following classes in the direction of increasingly more derived forms:
- Starfish (asteroidea)
- Sea urchin (Echinoidea)
- Sea whales (Holothuroidea)
- Brittle stars (Ophiuroidea)
literature
- Westheide, Wilfried, Rieger, Reinhard: Special Zoology Part 1 , 2nd Edition, Elsevier (2006)