Florent's Guide To The

Tropical Reefs

Long-Spined Urchin
Diadema antillarum
Long-Spined Urchin
Category: Sea Urchins
Scientific Name: Diadema antillarum
Size: 4 to 8 in. (10 to 20 cm)  
Depth: 0-160 ft. (0-50 m)
Distribution: Caribbean, Bahamas, South Florida, Bermuda
Echinodermata (Phylum)
└Echinozoa (Subphylum)
 └Echinoidea (Class)
  └Diadematoida (Order)
   └Diadematidae (Family)
    └Diadema (Genus)

Echinoderms
Sea Urchins

Long-Spined Urchin

Savignyi's Longspine Urchin

Black Longspine Urchin

Banded Urchin

Blue-Black Urchin

Variable Fire Urchin

Red Heart Urchin

Longspine Heart Urchin

Shingle Sea Urchin

Rock-Boring Urchin

Pale Rock-Boring Urchin

Oblong Sea Urchin

Reef Urchin

Needle-Spined Urchin

Red Slate Pencil Urchin

Bell's Sea Urchin (Juvenile)

Variegated Urchin

Jewel Urchin

Pebble Collector Urchin

Flower Urchin

Rose Flower Urchin

White Sea Urchin

Collector Urchin

West Indian Sea Egg

Rough-Spined Urchin

East Pacific Slate Pencil Urchin

Slate Pencil Urchin

Radiant Sea Urchin

Radiant Sea Urchin (Juvenile)



All Photographs
© 2025 Florent Charpin