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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..

Sedentary :: Sedentary (a.) Remaining in one place, especially when firmly attached to some object; as, the oyster is a sedentary mollusk; the barnacles are sedentary crustaceans..

Dactyl :: Dactyl (n.) The claw or terminal joint of a leg of an insect or crustacean.

Crustacean :: Crustacean (a.) Of or pertaining to the Crustacea; crustaceous.

Louse :: Louse (n.) Any small crustacean parasitic on fishes. See Branchiura, and Ichthvophthira..

Post-abdomen :: Post-abdomen (n.) That part of a crustacean behind the cephalothorax; -- more commonly called abdomen.

Ommateum :: Ommateum (n.) A compound eye, as of insects and crustaceans..

Urogastric :: Urogastric (a.) Behind the stomach; -- said of two lobes of the carapace of certain crustaceans.

Tube :: Tube (n.) A more or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm..

Gribble :: Gribble (n.) A small marine isopod crustacean (Limnoria lignorum or L. terebrans), which burrows into and rapidly destroys submerged timber, such as the piles of wharves, both in Europe and America..

Uropod :: Uropod (n.) Any one of the abdominal appendages of a crustacean, especially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda..

Trichobranchia :: Trichobranchia (n.) The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes..

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

Gnathopodite :: Gnathopodite (n.) Any leglike appendage of a crustacean, when modified wholly, or in part, to serve as a jaw, esp. one of the maxillipeds..

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

Hair :: Hair (n.) A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth..

Labrum :: Labrum (n.) An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of Hymenoptera..

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..

Palingenesy :: Palingenesy (n.) That form of evolution in which the truly ancestral characters conserved by heredity are reproduced in development; original simple descent; -- distinguished from kenogenesis. Sometimes, in zoology, the abrupt metamorphosis of insects, crustaceans, etc..

Endopleurite :: Endopleurite (n.) The portion of each apodeme developed from the interepimeral membrane in certain crustaceans.

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