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Rostrum :: Rostrum (n.) The anterior, often spinelike, prolongation of the carapace of a crustacean, as in the lobster and the prawn..

Astacus :: Astacus (n.) A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See Crawfish..

Thorax :: Thorax (n.) The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix..

Sutured :: Suture (n.) A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell..

Pygidium :: Pygidium (n.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite..

Nauplius :: Nauplius (n.) A crustacean larva having three pairs of locomotive organs (corresponding to the antennules, antennae, and mandibles), a median eye, and little or no segmentation of the body..

Malacostracology :: Malacostracology (n.) That branch of zoological science which relates to the crustaceans; -- called also carcinology.

Pleurobranch :: Pleurobranch (n.) Any one of the gills of a crustacean that is attached to the side of the thorax.

Exuviation :: Exuviation (n.) The rejecting or casting off of some part, more particularly, the outer cuticular layer, as the shells of crustaceans, skins of snakes, etc.; molting; ecdysis..

Sea Crayfish :: Sea crayfish () Any crustacean of the genus Palinurus and allied genera, as the European spiny lobster (P. vulgaris), which is much used as an article of food. See Lobster..

Decapod :: Decapod (n.) A crustacean with ten feet or legs, as a crab; one of the Decapoda. Also used adjectively..

Podophthalmite :: Podophthalmite (n.) The eyestalk of a crustacean.

Protopodite :: Protopodite (n.) The basal portion, or two proximal and more or less consolidated segments, of an appendage of a crustacean..

Swimming :: Swimmeret (n.) One of a series of flat, fringed, and usually bilobed, appendages, of which several pairs occur on the abdominal somites of many crustaceans. They are used as fins in swimming..

Crustaceous :: Crustaceous (a.) Belonging to the Crustacea; crustacean.

Coxa :: Coxa (n.) The first joint of the leg of an insect or crustacean.

Metanauplius :: Metanauplius (n.) A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages..

Propodite :: Propodite (n.) The sixth joint of a typical leg of a crustacean; usually, the penultimate joint..

Pedireme :: Pedireme (n.) A crustacean, some of whose feet serve as oars..

Palpus :: Palpus (n.) A feeler; especially, one of the jointed sense organs attached to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera..

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