Florent's Guide To The

Tropical Pacific Reefs

Red Slate Pencil Urchin
Heterocentrotus mamillatus
Red Slate Pencil Urchin
Category: Sea Urchins
Scientific Name: Heterocentrotus mamillatus
Size: 5 to 10 in. (12 to 25 cm)  
Depth: 3-160 ft. (1-50 m)
Distribution: Indo-Pacific, Hawaii
Echinodermata (Phylum)
└Echinozoa (Subphylum)
 └Echinoidea (Class)
  └Camarodonta (Order)
   └Echinometridae (Family)
    └Heterocentrotus (Genus)

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© 2025 Florent Charpin