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Zoea :: Zoea (n.) A peculiar larval stage of certain decapod Crustacea, especially of crabs and certain Anomura..

Hippe :: Hippe (n.) A genus of marine decapod crustaceans, which burrow rapidly in the sand by pushing themselves backward; -- called also bait bug. See Illust. under Anomura..

Aptera :: Aptera (n. pl.) Insects without wings, constituting the seventh Linnaen order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders..

Lignification :: Lignification (n.) A change in the character of a cell wall, by which it becomes harder. It is supposed to be due to an incrustation of lignin..

Crustacean :: Crustacean (n.) An animal belonging to the class Crustacea.

Arthropoda :: Arthropoda (n. pl.) A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea..

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..

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

Siphonostomata :: Siphonostomata (n. pl.) A tribe of parasitic copepod Crustacea including a large number of species that are parasites of fishes, as the lerneans. They have a mouth adapted to suck blood..

Anisopoda :: Anisopoda (n. pl.) A division of Crustacea, which, in some its characteristics, is intermediate between Amphipoda and Isopoda..

Paragnathus :: Paragnathus (n.) One of the two lobes which form the lower lip, or metastome, of Crustacea..

Oviferous :: Oviferous (a.) Egg-bearing; -- applied particularly to certain receptacles, as in Crustacea, that retain the eggs after they have been excluded from the formative organs, until they are hatched..

Bug :: Bug (n.) One of certain kinds of Crustacea; as, the sow bug; pill bug; bait bug; salve bug, etc..

Cumacea :: Cumacea (n. pl.) An order of marine Crustacea, mostly of small size..

Apus :: Apus (n.) A genus of fresh-water phyllopod crustaceans. See Phyllopod.

Carcinology :: Carcinology (n.) The department of zoology which treats of the Crustacea (lobsters, crabs, etc.); -- called also malacostracology and crustaceology..

Parasita :: Parasita (n. pl.) A division of copepod Crustacea, having a sucking mouth, as the lerneans. They are mostly parasites on fishes. Called also Siphonostomata..

Carapace :: Carapace (n.) The thick shell or shield which covers the back of the tortoise, or turtle, the crab, and other crustaceous animals..

Peraeopod :: Peraeopod (n.) One of the thoracic legs of a crustacean. See Illust. of Crustacea.

Shellfish :: Shellfish (n.) Any aquatic animal whose external covering consists of a shell, either testaceous, as in oysters, clams, and other mollusks, or crustaceous, as in lobsters and crabs..

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