Дефиниција: arthropod sensory structures consisting of special sensilla called the scolopidia, which are mechano-transducers and respond mainly to stretch or flexion. In insects, they consist of bundles of internal sensilla, each of which has a cap cell, an enveloping cell and one or more sense cells.
Дефиниција: A thin, almost knife-like, ridge of rock which is typically formed when two glaciers erode parallel U-shaped valleys. The arte is a thin ridge of rock that is left separating the two valleys. Artes can also form when two glacial cirques erode towards one another, although frequently this results in a saddle-shaped pass, called a col.
Дефиниција: A compound eye with no separation between the crystalline-cone layer and the retinula, each rhabdom receiving light only from its own corneal lens.