Spicule

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Spicule

Spicule (/ˈspɪkjuːl/; from Latin spiculum, meaning "a sharp point") is a structural element found in various organisms, particularly in sponges and certain species of worms and mollusks.

Definition

A spicule is a small, sharp-pointed structure typically composed of calcium carbonate or silica. In sponges, spicules form the supportive skeleton and can vary greatly in shape and size. In certain worms and mollusks, spicules are used for support or defense.

Etymology

The term "spicule" originates from the Latin spiculum, which translates to "a sharp point". This is in reference to the sharp, needle-like structure of spicules.

Related Terms

  • Sponge: A simple multicellular organism that contains spicules as part of its supportive skeleton.
  • Calcium Carbonate: A common substance found in rocks and the main component of the shells of marine organisms, snails, and eggshells. It is often the material that composes spicules.
  • Silica: A hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks. It is also a common material for spicules.
  • Mollusk: A large phylum of invertebrate animals, many of which have spicules for support or defense.
  • Worm: An elongated invertebrate animal with a soft, typically segmented body that may secrete a hardening substance to form spicules.

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