Florent's Guide To The Hawaiian, South Pacific and

Indo-Pacific Reefs

Longspine Heart Urchin
Maretia planulata
Longspine Heart Urchin
Also known as: Hearth Heart Urchin
Category: Heart Urchins
Scientific Name: Maretia planulata
Size: Up to 2 in. (5 cm)  
Depth: 3-150 ft. (1-45 m)
Distribution: Indo-Pacific
Echinodermata (Phylum) Echinoderms
└Echinozoa (Subphylum) Sea Urchins and Sea Cucumbers
 └Echinoidea (Class) Sea Urchins
  └Euechinoidea (Subclass)
   └Spatangoida (Order) Heart Urchins
    └Maretiidae (Family)
     └Maretia (Genus)
      └M. planulata (Species)
WoRMS ID: 214465🔗
iNaturalist ID: 50351🔗

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© 2026 Florent Charpin