Search the Dictionary

The distal segment of the hind limb of vertebrates, including the tarsus and foot.

m) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheæ. Called also Phalangides, Phalangidea, Phalangiida, and Opilionea.

The first of the four pieces composing the dorsal part, or tergum, of a thoracic segment of an insect. It is usually small and inconspicuous.

The anterior segment of the sternum; the manubrium. -- Pre*ster"nal, a.

The segment next to the flagellum of the antennæ of Crustacea.

One of the free, or nearly free, segments of a tapeworm. It contains both male and female reproductive organs, and is capable of a brief independent existence.

One of the fleshy legs found on the abdominal segments of the larvæ of Lepidoptera, sawflies, and some other insects. Those of Lepidoptera have a circle of hooks. Called also proped, propleg, and falseleg.

the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum.

The segment which forms the posterior part of the thorax of a hymenopterous insect. [Written also propodeum.]

The anterior segment of the brain, including the cerebrum and olfactory lobes; the forebrain.

The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

The second segment of one of the Gregarinæ.

The basal portion, or two proximal and more or less consolidated segments, of an appendage of a crustacean.

One of the primitive segments, or metameres, of an animal.

One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.

One of the primary, or first-formed, segments of an embryonic arthropod.

Sharply cut about halfway to the middle or base into five segments; as, a quinquefid leaf or corolla.

The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane. W. KÜhne.

The air pressure supported by each longitudinal foot segment of a wing.

One of series of segments of circles joined at their extremities, forming a border like the edge or surface of a scallop shell.