Eleutherozoa

Eleutherozoa
Sea Urchin ( Prionocidaris hawaiiensis )
Systematics
without rank: Multicellular animals (Metazoa) without rank: Tissue animals (Eumetazoa) without rank: Bilateria Over trunk : Neumünder (Deuterostomia) Trunk : Echinoderms (Echinodermata) Sub-stem : Eleutherozoa
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)