Most crustaceans are free-living aquatic animals, but some are terrestrial (e.g. woodlice, sandhoppers), some are parasitic (e.g. Rhizocephala, fish lice, tongue worms) and some are sessile (e.g. …

Dec 28, 2025 · crustacean, any member of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species distributed worldwide. Crabs, lobsters, …

Crustaceans have evolved a variety of specialized body forms and behaviors to cope with both aquatic and terrestrial environments; however, all crustaceans share several characteristics: a hard …

Jan 12, 2026 · The more than 50,000 crustacean species are generally divided into several major groups, including Malacostraca, Maxillopoda, and Branchiopoda. Malacostraca is the largest and …

May 15, 2024 · What is a crustacean in biology. What does it eat. Learn its examples, including habitat, organ systems, reproduction, and life cycle with images.

Oct 5, 2022 · Crustaceans are a large, diverse group of invertebrates of the phylum Arthropoda, whose classification also includes spiders, mites, scorpions and insects. Scientists believe that the number …

Nov 25, 2019 · A crustacean is an invertebrate animal with a hard exoskeleton, segmented body and jointed legs. Most crustaceans are fully aquatic, although some, including many crabs, are semi …

Crustaceans (subphylum Crustacea) comprise the group of arthropods (phylum Arthropoda) that includes the familiar crabs, lobsters, shrimps, barnacles, copepods, krill, water fleas, and crayfish.

Jun 20, 2018 · A crustacean is group of animals that includes crabs, lobsters, crayfish, and shrimp.

Dec 13, 2019 · Crustaceans include commonly-known marine life such as crabs, lobsters, barnacles, and shrimp. These animals are in the Phylum Arthropoda (the same phylum as insects) and …