Echinodermata: Class Concentricycloidea

The sea daisies, which were discovered in 1986, have disk-shaped flat bodies and are less than 0.39 in. (1 cm) in diameter. The two known species were located on wood found in deep waters off the coasts of New Zealand and the Bahamas. They have a water-vascular system, with tube feet on the body surface around the edge of the disk. They have no obvious arms or mouth, and appear to absorb nutrients through the membrane surrounded their bodies.

Sections in this article:

• Introduction
• Class Concentricycloidea
• Class Crinoidea
• Class Holothuroidea
• Class Echinoidea
• Class Ophiuroidea
• Class Asteroidea
• Anatomy and Physiology

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