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crustacea    
n. 甲壳类

甲壳类

Crustacea
n 1: class of mandibulate arthropods including: lobsters; crabs;
shrimps; woodlice; barnacles; decapods; water fleas [synonym:
{Crustacea}, {class Crustacea}]


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  • Definition, Characteristics, Evolution, Facts - Britannica
    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
  • Characteristics of crustaceans | Britannica
    crustacean , Any member of the 45,000 arthropod species in the subphylum Crustacea Distributed worldwide, crustaceans are distinguished by having two pairs of antenna-like appendages in front of the mouth and other paired appendages near the mouth that act like jaws
  • Malacostracan | Definition, Characteristics, Examples, Classification . . .
    malacostracan, any member of the more than 29,000 species of the class Malacostraca (subphylum Crustacea, phylum Arthropoda), a widely distributed group of marine, freshwater, and terrestrial invertebrates Lobsters, crabs, hermit crabs, shrimp, and isopods are all malacostracan crustaceans
  • Crustacean - Aquatic, Arthropod, Exoskeleton | Britannica
    The Crustacea as a whole shows great variation in the number of somites and the amount of fusion that has taken place In the class Malacostraca , which includes the decapods, there is a consistent body plan: the trunk (which follows the head) is divided into two distinct regions, an anterior thorax of eight somites and a posterior abdomen of
  • crustacean - Students | Britannica Kids | Homework Help
    Crustaceans belong to the subphylum Crustacea, which is part of the phylum Arthropoda, a large group that also includes insects, centipedes, and spiders Arthropods are characterized by their exoskeletons, which are composed of a tough, flexible substance called chitin
  • Crustaceans Portal | Britannica
    Crustaceans are a group of invertebrate animals consisting of some 45,000 species worldwide Crabs, lobsters, and shrimps are all counted among the subphylum Crustacea Crustaceans are found primarily in water, as noted by Sebastian the crab in Disney’s “The Little Mermaid” (1989)
  • Crustacean - Evolution, Paleontology, Adaptations | Britannica
    In classifying the Crustacea, a variety of characters are important: the form and extent of the carapace, if present; the number of trunk somites, or segments, and how many fuse with the head or with the telson; the number and degree of specialization of the trunk limbs; the presence or absence of paired eyes and of a caudal furca—i e , a
  • crustacean - Kids | Britannica Kids | Homework Help
    Crustaceans are animals that usually have a hard covering, or exoskeleton, and two pairs of antennas, or feelers People around the world eat many types of crustacean—for example, crabs, lobsters, shrimps (or prawns), and crayfish Barnacles, water fleas, and pill bugs are also crustaceans
  • Amphipod | Crustacean, Shrimp-Like, Marine Species | Britannica
    Amphipod, any member of the invertebrate order Amphipoda (class Crustacea) inhabiting all parts of the sea, lakes, rivers, sand beaches, caves, and moist (warm) habitats on many tropical islands Marine amphipods have been found at depths of more than 9,100 m (30,000 feet)





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