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See Direct, n.

One of the subclasses of Crustacea, including a large number of species, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera.

Relating to the Entomostraca. -- n.

Belonging to the Entomostracans.

An order of Entomostraca; -- so named from the feet of branchiopods having been supposed to perform the function of gills. It includes the fresh-water genera Branchipus, Apus, and Limnadia, and the genus Artemia found in salt lakes. It is also called Phyllopoda. See Phyllopoda, Cladocera. It is sometimes used in a broa…

A group of Entomostraca, with suctorial mouths, including species parasitic on fishes, as the carp lice (Argulus).

The minute marine animals (chiefly Entomostraca) upon which the right whales feed.

An order of the Entomostraca.

A genus of minute Entomostraca, found both in fresh and salt water. See Copepoda.

A Linnæan genus of parasitic Entomostraca, -- the same as the family Lernæidæ.

of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.

An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about. [Written also Ostracoda.]

An order of Entomostraca including a large number of species, most of which live in fresh water. They have flattened or leaflike legs, often very numerous, which they use in swimming. Called also Branchiopoda.

Originally, an artificial group including many parasitic Entomostraca, together with the horseshoe crabs (Limuloidea).

In a loose sense, any small crustacean, including some amphipods and even certain entomostracans; as, the fairy shrimp, and brine shrimp. See under Fairy, and Brine.

Any parasitic entomostracan of the tribe Siphonostomata.

Any one of numerous species of small aquatic Entomostraca belonging to the genera Cyclops, Daphnia, etc; -- so called because they swim with sudden leaps, or starts.