Leucopterine see pterine pteridine pigments

levation n. [L. levare, to raise] The raising of the leg or a part of the leg; part of protraction.

levator n. [L. levare, to raise] Any muscle serving to raise an organ or part.

levels of integration Levels of complexity in structures, patterns, or associations when new properties emerge that could not have been predicted from the properties of the component parts.

levigate a. [L. levigare, to make smooth] Smooth surfaced; polished.

Leydig cells 1. Secretory cells of various glands. 2. (ARTHRO: Insecta) In Hymenoptera, produces an attractant pher-onome in Apis; mandibular gland and Koshevnikov gland. 3. (MOLL: Gastropoda) In Prosobranchia, cells in the mantle, foot and around the digestive tract.

life cycle The complete series of successive forms through which any particular kind of organism passes in the course of its development to maturity.

ligament n. [L. ligare, to bind] 1. A band or sheet of tough, fibrous tissue between parts or segments. 2. (BRYO) Muscle fibers embedded in collagen with a tubular peritoneal envelope. 3. (MOLL: Bivalvia) A horny, elastic band located above the hinge, causing the valves to open when the adductor muscles relax.

ligamental area (MOLL: Bivalvia) An area between the umbo and ligament that shows the growth track of the ligament.

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