Definitions

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Valve

Lateral part of divided carapace commonly joined to opposite part by hingement along dorsal mid-line (e.g., Ostracoda, Conchostraca, Leptostraca). [Moore and McCormick, 1969]
Lateral part of divided carapace, commonly joined to opposite part by hingement along dorsal midline; also any one of opercular elements in sessile Cirripedia. [McLaughlin, 1980]
(Taxon-specific: ) Term applied to each half of carapace, one half (valve) covering each side of trunk. [Stachowitsch, 1992]
One of two shell elements comprising carapace. Covering left and right sides of body and joined together (or continuous) dorsally along hinge line. Consists of several layers and is variously ornamented on exterior. (See also carapace). [Stachowitsch, 1992]
Term applied to uropods covering branchial chamber in certain isopods. [Stachowitsch, 1992]
(Taxon-specific: Order Rhabditida) Opercular valve. [Stachowitsch, 1992]
Aortic valve, hepatic valve. [Stachowitsch, 1992]
One of two shell-like elements covering left and right sides of body (therefore left valve, right valve). Valves joined to each other dorsally by hinge and may bear complex system of ridges and grooves around margin that inter-fit when carapace is closed. Consists of inner and outer lamellae. (equal, subequal, unequal; amplete, postplete, preplete; lateral outline: circular, elliptical, elongate, ovate, quadrate, reniform; smooth, ornamented: e.g., alate, bilobate, bisulcate, bullate, caperate, carinate, celate, clavate, costate, foveolate, granuloreticulate, granulose, lobate, papillate, pitted, punctate, quadrilobate, reticulate, setose, spinose, striate, sulcate, trilobate, trisulcate, tuberculate, unilobate, unisulcate, verrucose) (See also valve sculpture). [Stachowitsch, 1992]
Right or left half of bivalved ostracode carapace (sometimes erroneously referred to as "shell"). [Cohen, Peterson, and Maddocks, in press]