description Stylocidaris affinis Overview
Stylocidaris affinis is a species of cidaroid sea urchin, commonly known as a pencil urchin or red lance urchin. Philippi described it in 1845, and records place it in the Mediterranean and Atlantic waters, including the Caribbean, Bermuda, and the Gulf of Mexico. It occurs on seabeds from shallow circalittoral settings to deep sedimentary habitats, with records extending to about 1,000 metres.
help Stylocidaris affinis FAQ
What is Stylocidaris affinis?
Stylocidaris affinis is a cidaroid sea urchin commonly called a pencil urchin or red lance urchin. It belongs to a group known for stout primary spines.
Who described Stylocidaris affinis?
Philippi described Stylocidaris affinis in 1845. The species has since been recorded from Mediterranean and Atlantic waters.
Where does Stylocidaris affinis live?
Records place it in the Mediterranean, the Caribbean, Bermuda, and the Gulf of Mexico. It is a marine species associated with seafloor habitats.
Why are cidaroid sea urchins called pencil urchins?
Cidaroids often have large, thick primary spines that look more like pencils than the fine spines of many other sea urchins. Stylocidaris affinis is included among these pencil-urchin forms.
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