Luzon sea star, Echinaster luzonicus, left one with commensal creeping comb jelly, Coeloplana astericolaEchinoderms:
Sea stars are unattached echinoderms. The mouth is located centrally on the ventral surface.
Luzon sea star, Echinaster luzonicus, left one with commensal creeping comb jelly, Coeloplana astericola
Brittle stars have long thin arms which attach to a flat pentagonal central disk.
[unidntified brittle stars]
Speckled brittle star, Ophiochasma stellata
Feather stars or crinoids are the oldest echinoderms. Some crinoids can swim, but most walk slowly on jointed legs.
[unidentified crinoids]
Sea urchins have external skeletons composed of ten fused calcareous plates, covered with numerous moveable spines.
Diadema sp.
Black longspine sea urchin, Diadema setosum
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Last modified 6 April 2026