Vagus see stomogastric nervous system

valency n. [L. valentia, strength] Power; important; value.

valid name An available name for a taxon that is not preoccupied by a valid senior synonym or homonym.

valva n.; pl. valvae [L. valva, leaf of a folding door] (ARTHRO: Insecta) In Lepidoptera, a valve in the external male genitalia; the coxite and the stylus. see harpagones.

valvate a. [L. valva, leaf of a folding door] 1. Furnished with valves. 2. Hinged only at the margin. 3. Of or pertaining to a valve.

valve n. [L. valva, leaf of a folding door] 1. Any structure that limits or closes an opening. 2. One of the discrete shells or plates of a mollusk, brachiopod or crustacean. 3. (ARTHRO:

Insecta) Certain external genitalia.

valve coverage (MOLL: Polyplacophora) 1. Complete coverage Two contiguous valves with the rear edge of one covering the whole front edge of the one posterior to it. 2. Partial coverage A small part of the front edge of the next valve that is overlapped. 3. Jugal coverage With only the apical part of a valve overlapping the next one.

valvelet n. [L. dim. valva, leaf of a folding door] A small valve or fold.

valvifers n.pl. [L. valva, leaf of a folding door; ferre, to bear] (ARTHRO: Insecta) The basal plates of the ovipositor, derived from the basal segment of the gonopods; also known as the first and second gonocoxae.

valvula n.; pl. valvulae [L. dim. valva, leaf of a folding door] 1. Any small valve-like process. 2. (ARTHRO: Insecta) In Hymenoptera, processes from the valvifers forming the body of the ovipositor and the ovipositor sheath.

valvular a. [L. dim. valva, leaf of a folding door] Of or pertaining to a small valve or valvula.

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