description Sphaerechinus granularis Overview
*Sphaerechinus granularis*, commonly known as the granular violet sea urchin, is a species of echinoderm inhabiting the Mediterranean Sea. Its distinctive feature is its heavily granulated skeletal structure, providing unique insights into marine invertebrate evolution and calcification processes. Researchers studying deep-sea biology and those investigating Mediterranean biodiversity frequently utilize this extant species in their research.
insights Ranking position
Sphaerechinus granularis ranks #15 of 128 in the Sea Urchin ranking, behind Pseudocentrotus depressus, ahead of Hemicentrotus pulcherrimus.
help Sphaerechinus granularis FAQ
Where does Sphaerechinus granularis live?
The granular sea urchin occurs in the Mediterranean Sea and the eastern Atlantic, including waters around the Azores and Canary Islands. It inhabits rocky bottoms, seagrass areas, and other coastal substrates.
Why does the granular sea urchin carry shells and debris?
Like several other sea urchins, Sphaerechinus granularis uses its tube feet to place algae, shells, and stones on its upper surface. This covering behaviour may provide camouflage and protection from strong light.
How can Sphaerechinus granularis be identified underwater?
Adults often have a violet or purplish test with dense, relatively short spines whose tips may contrast in colour. Its robust, rounded appearance differs from the longer-spined black sea urchin Arbacia lixula.
What does Sphaerechinus granularis eat?
It grazes on algae and seagrass material while also consuming encrusting organisms and organic matter encountered on the seabed. Its five-part jaw apparatus is the echinoid structure commonly called Aristotle's lantern.
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