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Myriapoda :: Myriapoda (n. pl.) A class, or subclass, of arthropods, related to the hexapod insects, from which they differ in having the body made up of numerous similar segments, nearly all of which bear true jointed legs. They have one pair of antennae, three pairs of mouth organs, and numerous trachaae, similar to those of true insects. The larvae, when first hatched, often have but three pairs of legs. See Centiped, Galleyworm, Milliped..

Subclavian :: Subclass (n.) One of the natural groups, more important than an order, into which some classes are divided; as, the angiospermous subclass of exogens..

Didelphia :: Didelphia (n. pl.) The subclass of Mammalia which includes the marsupials. See Marsupialia.

Teleostei :: Teleostei (n. pl.) A subclass of fishes including all the ordinary bony fishes as distinguished from the ganoids.

Entomostraca :: Entomostraca (n. pl.) 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..

Superordination :: Superorder (n.) A group intermediate in importance between an order and a subclass.

Prosobranchiata :: Prosobranchiata (n. pl.) The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate..

Elasmobranchii :: Elasmobranchii (n. pl.) A subclass of fishes, comprising the sharks, the rays, and the Chimaera. The skeleton is mainly cartilaginous..

Dioecia :: Dioecia (n. pl.) A subclass of gastropod mollusks in which the sexes are separate. It includes most of the large marine species, like the conchs, cones, and cowries..

Monotremata :: Monotremata (n. pl.) A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna..

Thalamiflorous :: Thalamiflorous (a.) Bearing the stamens directly on the receptacle; -- said of a subclass of polypetalous dicotyledonous plants in the system of De Candolle.

Dichotomy :: Dichotomy (n.) Division into two; especially, the division of a class into two subclasses opposed to each other by contradiction, as the division of the term man into white and not white..

Isopleura :: Isopleura (n. pl.) A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal..

Callyciflorous :: Callyciflorous (a.) Having the petals and stamens adnate to the calyx; -- applied to a subclass of dicotyledonous plants in the system of the French botanist Candolle.

Malacostraca :: Malacostraca (n. pl.) A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca..

Marsupialia :: Marsupialia (n. pl.) A subclass of Mammalia, including nearly all the mammals of Australia and the adjacent islands, together with the opossums of America. They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature. The female generally carries the young for some time after birth in an external pouch, or marsupium. Called also Marsupiata..

Musci :: Musci (n. pl.) An order or subclass of cryptogamous plants; the mosses. See Moss, and Cryptogamia..

Ganoidei :: Ganoidei (n. pl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales..

Phycoerythrine :: Phycoerythrine (n.) A red coloring matter found in algae of the subclass Florideae.

Florideae :: Florideae (n. pl.) A subclass of algae including all the red or purplish seaweeds; the Rhodospermeae of many authors; -- so called from the rosy or florid color of most of the species.

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