An acanthostyle is a spicule with tiny spines from monaxon
sponges.
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protection against predators
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An amphidisc is a spicule with a denticulate wheel at each end,
found in freshwater sponges.
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Spicules are spiny structures of sponges, used to harden their
outside and deter predators, making them harder to chew and digest.
They can be made of a range of substances including silicium
(glass!).
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Skeleton made up of spicule supports most sponges .