from The Century Dictionary.
- noun A small nerve; specifically, in entomology, a small nervure or vein of the wing, emitted by a larger one or connecting two other nervures. Also called nervulet, veinlet, venule, or branch.
Sorry, no etymologies found.
Discoidal nervule: Lepidoptera; = media 1 (Comst.).
"Note the anal angle of the secondaries and the argentiferous discal area bordering the subcostal nervule."
Mr. Edward Doubleday, in his "Genera of Diurnal Lepidoptera," says, "The Papilionidæ may be known by the apparently four-branched median nervule and the spur on the anterior tibiæ, characters found in no other family."
The four-branched median nervule is a character so constant, so peculiar, and so well marked, as to enable a person to tell, at a glance at the wings only of a butterfly, whether it does or does not belong to this family; and I am not aware that any other group of butterflies, at all comparable to this in extent and modifications of form, possesses a character in its neuration to which the same degree of certainty can be attached.