Lunar Underwing

Adventure step • Meet the species

Overview

The Lunar Underwing (Anchoscelis lunosa) is a captivating moth belonging to the family Noctuidae, characterized by elegant wings adorned with crescent moon-like markings. With a wingspan of 35-42 millimeters, it ranks among the medium-sized noctuid moths. The forewings display a beautiful variation of gray, brown, and reddish-brown tones with distinctive white or pale cross-lines and crescent-shaped spots that give the species its evocative name. The hindwings are lighter, often grayish with darker borders, giving the moth a subtle yet distinctive appearance. This species is distributed across much of the temperate zone of Europe and extends eastward into Asia. In the Nordic region, it occurs in southern and central Sweden, Norway, Denmark, and Finland, inhabiting varied environments from deciduous and mixed forests to parks, gardens, and agricultural landscapes. The moth prefers areas with abundant deciduous trees, particularly oak, birch, and willow, which serve as the primary host plants for the larvae. Adult moths are nocturnal and attracted to light sources, making them a common sight at light traps during late summer and autumn. The larvae are robust and well-equipped for survival. They have a greenish or brownish body with longitudinal stripes and feed on the leaves of deciduous trees from spring to early summer. After sufficient feeding, the larva transforms into a pupa in the soil, where it spends the summer in dormancy (aestivation). This is an adaptation to avoid the warmer months and synchronize with the host plants' growth cycle. The adult moths then emerge in August and September, making the Lunar Underwing an autumn-flying species. Anchoscelis lunosa is relatively common where it occurs and is not considered threatened. It plays an important ecological role as a pollinator of night-flowering plants and as prey for bats, nocturnal birds, and predatory insects. The species is an excellent example of the often-overlooked beauty and ecological significance of moths.