Verson's glands (ARTHRO: Insecta) In Lepidoptera larvae, large paired, segmental epidermal glands that secrete a "cement layer" over the wax layer; dermal glands.
vertebra n.; pl. -ae [L. vertebra, turning joint] (ECHINO) 1. In Asteroidea, the fused pair of opposite ambulacrals, articulating with adjacent vertebrae by ball-and-socket joints. 2. In Ophiuroidea, enclosed by a ventral arm plate and skin or a dorsal arm plate.
vertex n. [L. vertex, top] 1. The top; apex; summit; the highest or principal point. 2. (ARTHRO: Crustacea) The top point of the head or cephalon. 3. (ARTHRO: Insecta) The top of the head, between the eyes and anterior to the occipital suture; the crown of the head.
vertical a. [L. vertex, top] 1. Of or pertaining to the vertex;
highest point. 2. (ARTHRO: Insecta) A wing vein when both ends are equally distant from the wing base.
vertical bristles (ARTHRO: Insecta) In Diptera, two pair of bristles, "inner and outer" behind the upper and inner corners of the eyes; vertical cephalic bristles.
vertical classification Classification focusing on common descent, tending to unite ancestral and descendant groups of a phyletic line into a single higher taxon, thereby separating them from contemporaneous taxa having reached a similar grade of evolutionary change. see horizontal classification.
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