Blue crab, Callinectes, sapidus.
There are about 30,000 species of Crustacea . Most are marine, but many species live in freshwaters and a few species are terrestrial or amphibious . They include some of the most familiar forms, such as crabs, shrimps , and lobsters . They also include some of the most abundant and ecologically important forms, such as the planktonic copepods , and the mysids and euphausids (krill ) which are important food items for so many other marine organisms (such as fish).
There are about 30,000 species of Crustacea . Most are marine, but many species live in freshwaters and a few species are terrestrial or amphibious . They include some of the most familiar forms, such as crabs, shrimps , and lobsters . They also include some of the most abundant and ecologically important forms, such as the planktonic copepods , and the mysids and euphausids (krill ) which are important food items for so many other marine organisms (such as fish).
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