| 21. | The skeleton consists of spicules that form a protective cup around each polyp.
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| 22. | The only spicules present in this species are triactines.
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| 23. | The sclerocytes are responsible for the secretion of spicules.
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| 24. | However, an intestine full of glass spicules is no problem for a hawksbill.
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| 25. | Eagles have structures on their toes called spicules that allow them to grasp fish.
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| 26. | This peduncle can be distended to better anchor the spicules throughout the polyps tissues.
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| 27. | They are characterized by spicules made out of silicon dioxide, unlike calcareous sponges.
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| 28. | However, it was eventually discovered that many species had similar spicule sheath lengths.
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| 29. | Their spicules are simple and slender, and can be straight or slightly curved.
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| 30. | Hexasterophoran sponges have spicules called hexactines that have six rays set at right angles.
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