[unidentified sea stars]Echinoderms:
Sea stars are unattached echinoderms. The mouth is located centrally on the ventral surface.
[unidentified sea stars]
Luzon sea star, Echinaster luzonicus
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 30 October 2024