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One of the Arthropoda.

A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea. -- Ar*throp"o*dal, a.

ivisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda.

Having no jointed legs; pertaining to Anarthropoda.

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

the Invertebrata, nearly equivalent to the Articulata. It includes the Arthoropoda and Anarthropoda. By some zoölogists it is applied to the former only.

horns, and also feelers. The term in also applied to similar organs on the heads of other arthropods and of annelids.

One of the classes of Arthropoda. See Illustration in Appendix.

The external covering of an Arthropod.

One of the body segments of Arthropods. See Arthrostraca. Packard.

A joint of the cirri of the Crinoidea; a joint or segment of an arthropod appendage.

One of the somites (arthromeres) that make up the thorax of Arthropods. Packard.

One of the thoracic legs of Arthropods.

The thorax of Arthropods. Packard.

One of the somites (arthromeres) which make up the head of arthropods. Packard.

The anterior region or head of insects and other arthropods. Packard.

Surrounding the esophagus; -- in Zool. said of the nerve commissures and ganglia of arthropods and mollusks.

An arthropod.

One of the classes of the arthropods, including lobsters and crabs; -- so called from the crustlike shell with which they are covered.

Any one of the mouth appendages of the Arthropoda. They are known as mandibles, maxillæ, and maxillipeds.