| 41. | In sponges they secrete calcareous or siliceous spicules which are found in the mesohyl layer of sponges.
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| 42. | Spicules are formed in a cloud when the glass explodes from the contact of the cold jet.
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| 43. | The spicules are all of a similar shape, three-rayed " triactines ".
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| 44. | Their tegument is somewhat sticky because of the anchor-like spicules that project through the skin.
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| 45. | The skeleton is composed of spicules arranged radially near the surface, but chaotically in the interior.
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| 46. | Certain species have strange canoe-shaped spicules and these are all found in the Caribbean Sea.
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| 47. | Body and fins are covered with tiny spicules, resulting in a velvety feel that inspires the name.
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| 48. | Triactines are the most abundant spicules; the apical actine is shorter and thinner than the facial ones.
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| 49. | Its antennae are about the length of the head, and containing pointed spicules towards the inner side.
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| 50. | The gubernaculum is another organ of the nematode male copulatory system, which guides the spicules during copulation.
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