Spicules are small rigid structures that act like an endoskeleton, providing structural support for the sponge within the mesohyl of a sponge
The "bricks" or structural elements of a sponge are known as spicules, and each species has its own distinct range of spicule sizes, forms, and compositions. When combined, these characteristics can be examined under a microscope to ensure correct identification. Either calcium or silica makes up spicules.
The only skeleton in soft sponges that encrust such hard surfaces as rocks is an internal gelatinous matrix called the mesohyl, which serves as an endoskeleton in the majority of sponges. The mesohyl is typically strengthened by spongin fibers, mineral spicules, or both. Spicules serve as the skeleton and support system for sponges. Additionally, they offer defense against predators.
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