| 1. | Just underneath the madreporite, is a cup-like depression called the ampulla.
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| 2. | As the arms grow the disc begins to develop and eventually a madreporite appears.
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| 3. | The first is called the madreporite.
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| 4. | Beneath this is a water-filled cavity which contains the madreporite and delicate gill structures known as papullae.
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| 5. | It is created in larval pairs, with the left axocele developing into a channel between the hydrocele and the madreporite.
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| 6. | The color of the madreporite is light orange, and it has raised pores that connect to the water vascular system.
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| 7. | The sieve-like madreporite allows entry of seawater into the stone canal, which connects to the ring canal around the mouth.
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| 8. | The madreporite is usually located within one of the jaw plates, and not on the upper side of the animal as it is in starfish.
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| 9. | Its main parts are the madreporite, the stone canal, the ring canal, the radial canals, the lateral canals, and the tube feet.
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| 10. | At some stage in their development as yet unexplained, only 5 arms and one madreporite appear, and the ability to divide in this way is lost.
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