Stylocidaris affinis
Family Cidaridae

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Abundance: very common Distribution: outer shelf and
shelf-edge (50-100 m)

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Ventral (left) and dorsal views of a fairly common pencil urchin of the mid- to outer-continental shelf.
The test diameter is ~3.5 cm, whereas the pencil-like spines average ~3.5 cm.


Dorsal (left) and side views of specimens collected on the outer shelf. Tube worms have taken
advantage of the "hard substrate" available to them: pencil urchin spines! The worms use available
sediment from the seafloor to construct the tube.

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