Florent's Guide To The

Tropical Pacific Reefs

Radiant Sea Urchin
Astropyga radiata
Radiant Sea Urchin
Category: Sea Urchins
Scientific Name: Astropyga radiata
Size: Up to 8 in. (20 cm)  
Depth: 10-50 ft. (3-15 m)
Distribution: Indo-Pacific, Hawaii
Echinodermata (Phylum)
└Echinozoa (Subphylum)
 └Echinoidea (Class)
  └Diadematoida (Order)
   └Diadematidae (Family)
    └Astropyga (Genus)

Echinoderms
Sea Urchins

Radiant Sea Urchin

Radiant Sea Urchin (Juvenile)

Savignyi's Longspine Urchin

Black Longspine Urchin

Banded Urchin

Blue-Black Urchin

Variable Fire Urchin

Longspine Heart Urchin

Shingle Sea Urchin

Pale Rock-Boring Urchin

Oblong Sea Urchin

Needle-Spined Urchin

Red Slate Pencil Urchin

Bell's Sea Urchin (Juvenile)

Pebble Collector Urchin

Flower Urchin

Collector Urchin

Rough-Spined Urchin



All Photographs
© 2025 Florent Charpin