EVERYDAY SCIENCE

Detailed explanation-1: -Crustaceans are named after the Latin word crusta, which means “shell.” Crustaceans are a complex group of invertebrates that includes active animals like crabs, lobsters, shrimp, krill, copepods, amphipods, and barnacles, as well as more sessile species like barnacles.

Detailed explanation-2: -Class Branchiura. Class Cirripedia-barnacles. Class Malacostraca – lobsters, crayfish, crabs, shrimps, amphipods, isopods (including pillbugs and sowbugs), ad mantis shrimps.

Detailed explanation-3: -Crabs belong to the subphylum Crustacean, the largest group of marine arthropods, which also includes lobster, shrimp, and krill, a shrimp-like crustacean.

Detailed explanation-4: -Lobsters are classified in the phyllum Arthropoda (which also includes shrimp, crabs, barnacles, and insects.) The word Arthropoda comes from the Latin word “arthro”, meaning jointed, and the Greek word “poda”, foot.

Detailed explanation-5: -arthropod, (phylum Arthropoda), any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes. About 84 percent of all known species of animals are members of this phylum.