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A vertebrate distinguished by a skull with one pair of openings in the sidebehind the eyes, e.g., mammals and their close relatives.
Industry:Biology
In insects and some other terrestrial arthropods, a small opening through which air is taken into the tracheae. Insects have several spiracles, arranged along the sides of the abdomen.
Industry:Biology
Crystalline or mineral deposits found in sponges, sea cucumbers, or urochordates. They are structural components in many sponges, and may serve a protective function in other organisms.
Industry:Biology
Support structure in animals, against which the force of muscles acts. Vertebrates have a skeleton of bone or cartilage; arthropods have one made of chitin; while many other invertebrates use a hydrostatic skeleton, which is merely an incompressible fluid-filled region of their body.
Industry:Biology
Opening in molluscs or in urochordates which draws water into the body cavity. In many molluscs, the siphon may be used to expel water forcibly, providing a means of propulsion.
Industry:Biology
Partition which divides up a larger region into smaller ones, such as in the central body cavity of some anthozoa.
Industry:Biology
In many animals, the body is divided into repeated subunits called segments, such as those in centipedes, insects, and annelids. Segmentation is the state of having or developing a body plan in this way.
Industry:Biology
In trilobites, the posterior division of the body, formed by fusion of the telson with one or more posterior pleurae.
Industry:Biology
Elongated organ, usually associated with the mouth. The proboscis is an important feeding appendage in echiurans.
Industry:Biology
