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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, 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
  • Crustacean - Aquatic, Arthropod, Exoskeleton | Britannica
    Crustacean - Aquatic, Arthropod, Exoskeleton: The sexes are usually separate in crustaceans, but some are parthenogenetic, and others are hermaphrodites; differences between the sexes can be extreme The most typical larva is called a nauplius Crustaceans play many roles in aquatic ecosystems The basic crustacean body consists of somites, acron, telson, appendages, carapace, and an exoskeleton
  • Crustacean - Anatomy, Adaptations, Diversity | Britannica
    Crustacean - Anatomy, Adaptations, Diversity: The crustacean nervous system consists of a brain connected to a nerve cord of ganglia The most conspicuous sense organs are the compound eyes The digestive tract is usually direct in its passage through the body, and the antennal and maxillary glands are the two different excretory organs Many smaller crustaceans have no special respiratory organs
  • Crustacean - Evolution, Paleontology, Adaptations | Britannica
    Crustacean - Evolution, Paleontology, Adaptations: The evolution of crustaceans can be studied with two approaches: interpretation of evidence from comparative anatomy, or consideration of the fossil record The earliest of the definite fossil crustaceans are ostracods; a decapod occurs in the Devonian In classifying the Crustacea, a variety of structural features are important
  • Crustacean - Arthropod, Aquatic, Decapod | Britannica
    Crustacean - Arthropod, Aquatic, Decapod: Crustaceans have two pairs of sensory appendages in front of the mouth and 3 pairs of jaws behind the mouth; most are aquatic Some are parasitic and lack all appendages when adult Subphylum Crustacea has about 45,000 known species There is no universal agreement on the classification of Crustacea
  • 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 Most species are marine, including shrimps and barnacles Some, including crayfishes, live in freshwater habitats; others (e g
  • 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
  • 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
  • Crustaceans Browse - Page 1 | 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
  • Arthropod - Insects, Crustaceans, Arachnids | Britannica
    Arthropod - Insects, Crustaceans, Arachnids: Arthropod classes are based on criteria such as modification, specialization, number, and appearance of body segments and appendages Their relationships both within the phylum and with other animal phyla are uncertain Phylum Arthropoda consists of the subphyla Chelicerata, Crustacea, Myriapoda, Hexapoda, and the extinct Trilobitomorpha (trilobites)





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