direct wing muscles (ARTHRO: Insecta) The axillary and dorsal muscles of a wing.
disaccharides n.pl. [L. dis, twice; saccharum, sugar] A carbohydrate which can be hydrolized into two monosaccharides.
disc, disk n. [L. discus, circular plate] 1. Any flattened part in the form of a disc. 2. Circumoral area of many animals. 3. (ARTHRO: Insecta) In Coleoptera, the general dorsal surface of the elytra, usually marked by longitudinal striae corresponding to a row of sclerotized pillars connecting the upper and lower faces of the elytra. 4. (ECHINOD: Asteroidea) The central part of the body. 5. (MOLL: Bivalvia) The whole valve exclusive of the auricles in Pectinacea. discal a.
discal area (ARTHRO: Insecta) In wings, the central area or area covered by the discal cell.
discal bristle (ARTHRO: Insecta) In Diptera, one or more pairs of bristles in the mid-dorsal wall of the abdominal segment.
discal cell (ARTHRO: Insecta) A cell in the basal or central part of the wings.
discal cross vein (ARTHRO: Insecta) A cross vein behind the discal cell in a wing.
discal elevation (ARTHRO: Insecta) In Hemiptera, the central area of the anterior wing raised above the surrounding level.
discal patch (ARTHRO: Insecta) In male hesperoid butterflies, conspicuous patches, tufts, or brushes of modified scales, sometimes contained in eversible folds of the anterior wing.
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