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crustacean
crus·ta·cean C0778400 (krŭ-stā′shən)n. Any of various predominantly aquatic arthropods of the subphylum (or class) Crustacea, including lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body, a chitinous exoskeleton, paired jointed limbs, and two pairs of antennae.
[From New Latin Crūstācea, class name, neuter pl. of crūstāceus, hard-shelled, from Latin crusta, shell; see kreus- in Indo-European roots.]
crus·ta′cean adj.crustacean (krʌˈsteɪʃən) n (Animals) any arthropod of the mainly aquatic class Crustacea, typically having a carapace hardened with lime and including the lobsters, crabs, shrimps, woodlice, barnacles, copepods, and water fleasadj (Animals) of, relating to, or belonging to the Crustacea[C19: from New Latin crūstāceus hard-shelled, from Latin crūsta shell, crust]crus•ta•cean (krʌˈsteɪ ʃən)
n. 1. any chiefly aquatic arthropod of the class Crustacea, typically having the body covered with a hard shell, including lobsters, shrimps, crabs, barnacles, and wood lice. adj. 2. belonging or pertaining to the Crustacea. [1825–35; < New Latin Crustace(a) (see crust, -acea) + -an1] crus·ta·cean (krŭ-stā′shən) Any of various arthropods that live mostly in water and have a hard shell, a segmented body, and jointed appendages. Crustaceans include crabs, lobsters, shrimp, and barnacles.insect, spider, crustacean - One major difference between insects, spiders, and crustaceans is the antennae; most insects have one pair, spiders have none, and crustaceans have two pairs.See also related terms for spider.Thesaurus| Noun | 1. |  crustacean - any mainly aquatic arthropod usually having a segmented body and chitinous exoskeletonarthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitinclass Crustacea, Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleasgreen gland - one of a pair of glands (believed to have excretory functions) in some crustaceans near the base of the large antennaemalacostracan crustacean - a major subclass of crustaceansdecapod, decapod crustacean - crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thoraxbrachyuran - typical crabsstomatopod, stomatopod crustacean - a kind of crustaceanbranchiopod, branchiopod crustacean, branchiopodan - aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feedingcopepod, copepod crustacean - minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fishmussel shrimp, ostracod, seed shrimp - tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shellbarnacle, cirriped, cirripede - marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaceschela, nipper, pincer, claw - a grasping structure on the limb of a crustacean or other arthropods | | Adj. | 1. | crustacean - of or belonging to the class Crustaceacrustaceous |
crustaceanCrustaceans barnacle, crab, crayfish, crawfish, (U.S.) or (Austral. & N.Z. informal) craw, Dublin Bay prawn, freshwater shrimp, goose barnacle, gribble, hermit crab, horseshoe crab or king crab, king prawn, krill, land crab, langoustine, lobster, Norway lobster, opossum shrimp, oyster crab, prawn, robber crab, sand hopper, beach flea, or sand flea, sand shrimp, scorpion, sea spider, shrimp, soft-shell crab, spider crab, spiny lobster, rock lobster, crawfish, or langouste, water fleaTranslationscrustacean (kraˈsteiʃən) noun, adjective (of) any of a group of animals, including crabs, lobsters, shrimps etc, whose bodies are covered with a hard shell. 甲殼綱動物 甲壳纲的动物crustacean
crustacean (krŭstā`shən), primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crustacean species are marine, but there are many freshwater forms. The few groups that inhabit terrestrial areas have not been particularly successful in an evolutionary sense; most require very humid environments in order to survive. Types of Crustaceans The most important classes of Crustacea are Branchiopoda, which includes the brine shrimp; Maxillopoda, which includes the barnacles and copepods; Ostracoda, which includes the mostly very small seed shrimp; and Malacostraca, which includes the familiar shrimpshrimp,
small marine decapod crustacean with 10 jointed legs on the thorax, well-developed swimmerets on the abdominal segments, and a body that is compressed laterally.
..... Click the link for more information. , crayfishcrayfish
or crawfish,
freshwater crustacean smaller than but structurally very similar to its marine relative the lobster, and found in ponds and streams in most parts of the world except Africa. Crayfish grow some 3 to 4 in. (7.6–10.
..... Click the link for more information. , lobsterslobster,
marine crustacean with five pairs of jointed legs, the first bearing large pincerlike claws of unequal size adapted to crushing the shells of its prey. The segmented body of the lobster consists of a large cephalothorax (made up of 14 segments) and a moveable, muscular
..... Click the link for more information. , and crabscrab,
crustacean with an enlarged cephalothorax covered by a broad, flat shell called the carapace. Extending from the cephalothorax are the various appendages: five pairs of legs, the first pair bearing claws (or pincers), are attached at the sides; two eyes on short, movable
..... Click the link for more information. . Most of the smaller marine crustaceans can be found in plankton (see marine biologymarine biology,
study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or benthic. Nektonic animals are those that swim and migrate freely, e.g.
..... Click the link for more information. ) and thereby occupy an important position in the marine food chain. For example, the crustacean subclass Copepoda supplies the food of the crustacean order Euphausiacea, the euphausids or krill, shrimplike creatures that are the food of baleen whales and other marine animals. Other copepods supply food for small fish, and still others exist as parasites on the skin and gills of fish. Best known of the smaller freshwater crustaceans are members of the genus Daphnia (water fleas), the fairy shrimp (a phyllopod that swims inverted), and Cyclops (a copepod). The order Isopoda includes the only large group of truly terrestrial crustaceans. Known as woodlice, sow bugs, or pillbugs, these small animals can be found under the bark of trees, beneath stones and rocks, and in other damp places. When disturbed they curl up armadillolike, withdrawing into the exoskeleton. Crustacean Anatomy All crustaceans have bilaterally symmetrical bodies covered with a chitinous exoskeleton, which may be thick and calcareous (as in the crayfish) or delicate and transparent (as in water fleas). Since it does not grow, the exoskeleton must be periodically molted when the animal undergoes metamorphosis (typically from free-swimming larva to adult) or simply outgrows its shell. The free-swimming larva characteristic of crustaceans, called a nauplius larva, has an unsegmented body, a median eye, and three pairs of appendages. Like other arthropods, adult crustaceans have segmented bodies and jointed legs; the segments are usually grouped into a recognizable head, thorax, and abdomen. In the majority of larger crustaceans the head and thorax are fused into a cephalothorax, which is protected by a large shieldlike area of the exoskeleton called the carapace. The head bears two pairs of antennae, usually one median eye and two lateral eyes, and three pairs of biting mouthparts—the mandibles and the two pairs of maxillae. Crustacean appendages have undergone extensive adaptation for various tasks such as swimming, sensory reception, and walking. Many species have the first pair of thoracic appendages modified into claws and pincers. The gills are generally attached at the bases of the thoracic appendages, and the beating of the appendages creates a flow of water over the gills that facilitates respiration. Reproduction is sexual, and in most forms the sexes are separate. In many species the eggs are brooded beneath the abdominal segments of the female. Classification Crustaceans constitute the subphylum Crustacea of the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
..... Click the link for more information. . crustacean any arthropod of the mainly aquatic class Crustacea, typically having a carapace hardened with lime and including the lobsters, crabs, shrimps, woodlice, barnacles, copepods, and water fleas crustacean
crustacean (krŭ-stā′shən)n. Any of various predominantly aquatic arthropods of the subphylum (or class) Crustacea, including lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body, a chitinous exoskeleton, paired jointed limbs, and two pairs of antennae.
crus·ta′cean adj.crustacean a member of the class Crustacea in the phylum Arthropoda. The class includes shrimps, lobsters, crabs and water fleas. Most forms are aquatic, although a few are terrestrial, living in damp places, e.g. woodlice.crustacean
Synonyms for crustaceannoun any mainly aquatic arthropod usually having a segmented body and chitinous exoskeletonRelated Words- arthropod
- class Crustacea
- Crustacea
- green gland
- malacostracan crustacean
- decapod
- decapod crustacean
- brachyuran
- stomatopod
- stomatopod crustacean
- branchiopod
- branchiopod crustacean
- branchiopodan
- copepod
- copepod crustacean
- mussel shrimp
- ostracod
- seed shrimp
- barnacle
- cirriped
- cirripede
- chela
- nipper
- pincer
- claw
adj of or belonging to the class CrustaceaSynonyms |