description Diadema savignyi Overview
Diadema savignyi is a regular sea urchin belonging to the Diadematidae family and found throughout the Indo-Pacific region. This long-spined species is notable for its distinctive appearance and role in maintaining reef ecosystems. It’s frequently studied by marine biologists and researchers investigating invertebrate biodiversity and ecological processes within coral reefs.
help Diadema savignyi FAQ
How can Diadema savignyi be distinguished from other long-spined urchins?
It has extremely long, slender spines and often shows bright blue lines or spots on the dark test. Identification can still be difficult because it overlaps geographically and visually with Diadema setosum.
Are the spines of Diadema savignyi venomous?
The brittle spines can penetrate skin and break off, causing painful wounds and inflammation. Divers should avoid touching the animal even though it does not actively attack people.
What does Diadema savignyi do for a coral reef?
It grazes algae from reef surfaces, which can preserve open space where coral larvae may settle. Excessive grazing, however, can also scrape reef surfaces, so its ecological effect depends on population density and local conditions.
Where does Diadema savignyi live during the day?
It commonly shelters in reef crevices and shaded spaces while daylight is strong. The urchin becomes a more active grazer after dark across its Indo-Pacific range.
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