"Shellfish" covers three completely unrelated phyla of sea life.
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MollusksThese three Orders are related only at the Phylum level. Each order includes Suborders, Families, and Genera.
CrustaceansThese critters all belong to Class Malacostraca and are descended from a common ancester, but they started diverging into separate Subclasses and Superorders about 410 million years ago. Echinoderms- Sea cucumbers, Sea Urchins (Uni), Starfish. |