Asterias (Star fish), Echinus (Sea urchin), Antedon (Sea Lily) are all examples of which Phylum?
Echinodermata
Asterias (starfish), Echinus (sea urchin) and Antedon (sea lily) are exclusively marine animals with pentaradial symmetry, a calcareous endoskeleton and a water vascular system — the defining features of phylum Echinodermata ("spiny-skinned").
Annelida are segmented worms, Platyhelminthes are flatworms, and Arthropoda have jointed appendages and exoskeletons — none fit these examples.
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