Crustacean - Wikipedia 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 barnacles) The group has an extensive fossil record, reaching back to the Cambrian
Crustacean | Definition, Characteristics, Evolution, Facts . . . crustacean, any member of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species distributed worldwide Crabs, lobsters, shrimps, and wood lice are among the best-known crustaceans, but the group also includes an enormous variety of other forms without popular names
What are Crustaceans? – INHS Crustacean Collection 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 exoskeleton, jointed, paired appendages, and three body regions (head, thorax, and abdomen)
Crustaceans - A-Z Animals 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 of crustacean species worldwide is between 50,000 and 67,000
CRUSTACEAN Definition Meaning - Merriam-Webster The meaning of CRUSTACEAN is any of a large class (Crustacea) of mostly aquatic mandibulate arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often much modified appendages on each segment, and two pairs of antennae and that include the lobsters, shrimp, crabs, wood lice, water fleas, and barnacles
What Is A Crustacean? The Ultimate Guide To Crustaceans 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-aquatic, and others, such as woodlice, are fully terrestrial (land-dwelling)
Crustaceans - Point Reyes National Seashore (U. S. National . . . Crustaceans have a couple of defining qualities They have segmented bodies with hardened shells which are regularly shed Their limbs have two branches to them, and they have two pairs of antennae Six classes make up the subphylum Crustacea and are by far the most dominant arthropod on earth