decticous Possessing articulating madables in the pupa. Used to free the adult from the cocoon.
decumbent Bent downward. eg. decumbent hairs of Coleoptera [see picture]
denticulate With small teeth like projections.
diapause A period of suspended growth or development, usually with greatly decreased metabolism, allowing the animal to survive a seasonal unfavurable period, such as winter cold or summer heat or drought.
dimorphic The occurence of two forms, distinct in colouration and/or structure.
disc (of pronotum). The area of the pronotum which is visible dorsally and usually delimited laterally by the two lateral carinae. Contrasted with the paired pronotal hypomera, which extend onto the ventral surface.
discal carina (pl. Carinae) (of pronotum). One or more sublateral, paramedian or median, longitudinal carinae on the pronotal disc. Contrasted with the lateral carinae, which form the edges of the disc.
discal cell Prominent often large cell near the center of the wing.
discoidal cell/area/field Especially Odonta. MA(+) and CuP(-), unbranched, with the supplement Maspl(-), between them, enclose the discoidal field, which ends proximally in the discoidal cell immeadiately distal to the posterior segment of the Arc. This cell is never divided longitudinally in Zygoptera, in which it is the quadrilateral. In Anisoptera this cell is a triangle. Pictures.
discrimen (of meso- or metaventrite). Median longitudinal groove in the metaventrite and occasionally the mesoventrite, representing an area of invagination of the original sternum. Also called the discriminal line. Term usually applied to metaventral discrimen only.
distal (distad). An adjective (or adverb) denoting position near or at or movement toward the free end of an appendage or that furthest from the body.
ditrysian Having separate copulatory and oviposition apertures in the female, with the bursa copulatrix connected to the vagina by an internal duct, the ductus seminalis.
diurnal Active in the daytime.
dorsal (dorsad). An adjective (or adverb) denoting position near or movement toward the upper side of the body or a body part.
dorsal lobe (of penis). The upper lobe a penis which is divided horizontally into dorsal and ventral lobes (as in Dascillidae, some Scirtidae and some Psephenidae). See Tectum.
dorso-central bristles Two rows of setae running along either outer side of the acrostichal bristles on the thorax of diptera.
dorsum Anal margin of wing.
double tegmen. Tegmen which has three anterior struts, two on one side of the penis and one on the other (usually two dorsally and one ventrally).