A useful defense mechanism is evident in the slime stars. They will fill a bucket full of slime when picked up, this can be toxic to other invertebrates.
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Eleutherozoa
Class: Asteroidea
Order: Velatida
Family: Pterasteridae
Genus: Pteraster
Species: P. tesselatus
Other Members of the Phylum Echinodermata at Race Rocks.
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