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Sorry, no etymologies found.
Nodal sector: in Odonata; = media 2 (Comst.): arises from upper sector of arculus near nodus and extends to outer margin.
(Comst.); Trichoptera; one, two or three cells enclosed by the branches that form-the post-costal or anal vein: Odonata; an elongate cell between radius and cubitus, just before the arculus.
Apical cells or cellules: Trichoptera; the series of cells along the outer margin of wing from pterostigma to arculus.