description Astropyga radiata Overview
Astropyga radiata is a regular sea-urchin belonging to the Diadematidae family. This extant Indo-Pacific species is notable for its distinctive long spines and symmetrical structure. It’s primarily found in shallow waters of the western Pacific Ocean. Researchers studying echinoderm morphology and biodiversity, as well as marine biologists investigating coral reef ecosystems, frequently examine Astropyga radiata.
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Astropyga radiata ranks #12 of 139 in the Sea Urchin ranking, behind Mesocentrotus nudus, ahead of Echinus esculentus.
help Astropyga radiata FAQ
Are the spines of Astropyga radiata venomous?
Some of its shorter spines can deliver venom and cause a painful puncture. Divers should avoid touching the animal even though its large body and bright blue-spotted markings make accidental contact less likely.
Where can divers encounter Astropyga radiata?
The species inhabits tropical Indo-Pacific waters, including areas from East Africa across Southeast Asia to Pacific islands. It is usually found on sandy or rubble bottoms, seagrass beds and reef margins in relatively shallow water.
What are the blue dots on a radiating fire urchin?
The iridescent blue dots form lines on five V-shaped bare areas between groups of spines. Together with the radial body pattern, these markings distinguish Astropyga radiata from many uniformly dark long-spined urchins.
Why are small fish and shrimp sometimes hiding around this sea urchin?
Its long spines provide shelter from larger predators. Commensal associates include shrimp such as Stegopontonia commensalis, the zebra crab Zebrida adamsii and juveniles of several reef-fish species.
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