Antenna Shapes of Lepidoptera
Bipectinate: Resembling a feather—many tiny extensions along both sides of the shaft, with one pair of extensions at each junction. Also called pinnate or plumose. Found in many moth species.
Clubbed: A thickening (club) occurs at or near the tip of the shaft of the antenna. The club is at the tip in butterflies. In skippers, there is usually a short narrow extension beyond the club; this extension is usually bent at right angles to the shaft, producing a hook-like shape. In nearly all cases the moth antenna does not have a club.
Filiform: Thread-like—no club or branches. Also called simple. Found in many moth species
Pectinate: Comb-like—many tiny extensions along one side of the shaft. Also called unipectinate. Found in many moth species.
Quadripectinate: Like bipectinate, except that there are two pairs of extensions at each junction. Also called doubly bipectinate. Found in many moth species.