About Orthonama obstipata (Fabricius, 1794)
This species is Orthonama obstipata (Fabricius, 1794). The adult moth has a wingspan ranging from 18–21 mm (0.71–0.83 in). Within its core range, which includes Belgium and the Netherlands, adults can be observed between April and November. In outlying regions, this species is most commonly encountered in late summer and early autumn, when vagrant individuals are abundant. This moth species shows strong sexual dimorphism. Males are light brown, with a wavy pattern of whitish lines and a broad darker band across the wings. When the moth is at rest, this band forms concentric semicircles. Each forewing has a small black spot with a whitish rim located within the darker band, between the center of the wing and its leading edge. Females are slightly larger than males and much darker in color, with an almost uniform blackish brown tone. They have an indistinct lighter pattern, and also bear a forewing spot matching the one found on males. Fully grown caterpillars are greenish or brownish, and are slightly tapered toward the head. Their sides are yellowish, and on the middle body segments, pale diamond-shaped spots with dark outlines and black centers are prominent.
