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The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.

Without claws on the feet (of crustaceous animals).

A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostr…

A division of Crustacea, which, in some its characteristics, is intermediate between Amphipoda and Isopoda.

A group of decapod Crustacea, of which the hermit crab in an example.

Irregular in the character of the tail or abdomen; as, the anomural crustaceans. [Written also anomoural, anomouran.]

A movable, articulated organ of sensation, attached to the heads of insects and Crustacea. There are two in the former, and usually four in the latter. They are used as organs of touch, and in some species of Crustacea the cavity of the ear is situated near the basal joint. In insects, they are popularly called horns,…

A small antenna; -- applied to the smaller pair of antennæ or feelers of Crustacea.

sses of the shell which project inwards and unite with one another, in the thorax of many Crustacea.

gs, constituting the seventh Linnæn 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.

A genus of fresh-water phyllopod crustaceans. See Phyllopod.

An interstice or small space, as between the cracks of the surface in certain crustaceous lichens; or as between the fibers composing organs or vessels that interlace; or as between the nervures of an insect's wing.

A genus of copepod Crustacea, parasitic of fishes; a fish louse. See Branchiura.

A genus of small isopod Crustacea that can roll themselves into a ball.

A genus of phyllopod Crustacea found in salt lakes and brines; the brine shrimp. See Brine shrimp.

acing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea. -- Ar*throp"o*dal, a.

One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.

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

A light or hasty luncheon. Bait bug (Zoöl), a crustacean of the genus Hippa found burrowing in sandy beaches. See Anomura.

Any cirriped crustacean adhering to rocks, floating timber, ships, etc., esp. (a) the sessile species (genus Balanus and allies), and (b) the stalked or goose barnacles (genus Lepas and allies). See Cirripedia, and Goose barnacle. Barnacle eater (Zoöl.), the orange filefish. -- Barnacle scale (Zoöl.), a bark louse (Ce…