Moths are a group of insects that includes all members of the order Lepidoptera that are not butterflies.[1] They were previously classified as suborder Heterocera, but the group is paraphyletic with respect to butterflies (suborder Rhopalocera) and neither subordinate taxon is used in modern classifications. Moths make up the vast majority of the order. There are approximately 160,000 species of moth,[2] many of which have yet to be described. Most species of moth are nocturnal, although there are also crepuscular and diurnal species.
While the butterflies form a monophyletic group, the moths, comprising the rest of the Lepidoptera, do not. Many attempts have been made to group the superfamilies of the Lepidoptera into natural groups, most of which fail because one of the two groups is not monophyletic: Microlepidoptera and Macrolepidoptera, Heterocera and Rhopalocera, Jugatae and Frenatae, Monotrysia, and Ditrysia.[3]
Although the rules for distinguishing moths from butterflies are not well established, one very good guiding principle is that butterflies have thin antennae and (with the exception of the family Hedylidae) have small balls or clubs at the end of their antennae. Moth antennae are usually feathery with no ball on the end. The divisions are named by this principle: "club-antennae" (Rhopalocera) or "varied-antennae" (Heterocera). Lepidoptera first evolved during the Carboniferous period, but only evolved their characteristic proboscis alongside the rise of angiosperms in the Cretaceous period.[4]
Etymology
The modern English word moth comes from Old Englishmoððe (cf.Northumbrianmohðe) from Common Germanic (compare Old Norsemotti, Dutchmot, and GermanMotte all meaning 'moth'). Its origins are possibly related to the Old English maða meaning 'maggot' or from the root of midge which until the 16th century was used mostly to indicate the larva, usually in reference to devouring clothes.
Moth larvae, or caterpillars, make cocoons from which they emerge as fully grown moths with wings. Some moth caterpillars dig holes in the ground, where they live until they are ready to turn into adult moths.[5]
History
Moths evolved long before butterflies; moth fossils have been found that may be 190 million years old. Both types of Lepidoptera are thought to have co-evolved with flowering plants, mainly because most modern species, both as adults and larvae, feed on flowering plants. One of the earliest known species that is thought to be an ancestor of moths is Archaeolepis mane. Its fossil fragments show scaled wings that are similar to caddisflies in their veining.[6]
Economics
Significance to humans
An adult male pine processionary moth (Thaumetopoea pityocampa). This species is a serious forest pest when in its larval state. Notice the bristle springing from the underside of the hindwing (frenulum) and running forward to be held in a small catch of the forewing, whose function is to link the wings together.
Several moths in the family Tineidae are commonly regarded as pests because their larvae eat fabric such as clothes and blankets made from natural proteinaceous fibers such as wool or silk.[9] They are less likely to eat mixed materials containing some artificial fibers. There are some reports that they may be repelled by the scent of wood from juniper and cedar, by lavender, or by other natural oils; however, many consider this unlikely to prevent infestation. Naphthalene (the chemical used in mothballs) is considered more effective, but there are concerns over its effects on human health.
Despite being commonly thought to be undertaken by all moths,[10][11] only the larvae of several moth species eat animal fibres, creating holes in articles of clothing, in particular those made of wool. Most species do not eat fabrics, and some moth adults do not even eat at all. Some, like the Luna, Polyphemus, Atlas, Promethea, cecropia, and other large moths do not have mouth parts. This is possible because they live off the food stores from when they were a caterpillar, and only live a short time as an adult (roughly a week for some species).[12] Many species of adult moths do however eat: for instance, many will drink nectar.[9]
Items of fabric infested by clothes moth larvae may be treated by freezing them for several days at a temperature below −8 °C (18 °F).[13]
Some moths are farmed for their economic value. The most notable of these is the silkworm, the larva of the domesticated moth Bombyx mori. It is farmed for the silk with which it builds its cocoon. As of 2002[update], the silk industry produces more than 130 million kilograms of raw silk, worth about 250 million U.S. dollars, each year.[14][15][16]
Not all silk is produced by Bombyx mori. There are several species of Saturniidae that also are farmed for their silk, such as the ailanthus moth (Samia cynthia group of species), the Chinese oak silkmoth (Antheraea pernyi), the Assam silkmoth (Antheraea assamensis), and the Japanese silk moth (Antheraea yamamai).
The larvae of many species are used as food, particularly in Africa, where they are an important source of nutrition. The mopane worm, the caterpillar of Gonimbrasia belina, from the family Saturniidae, is a significant food resource in southern Africa. Another saturniid used as food is the cavorting emperor (Usta terpsichore). In one country alone, Congo, more than 30 species of moth larvae are harvested. Some are sold not only in the local village markets, but are shipped by the ton from one country to another.[17]
Nocturnal insectivores often feed on moths; these include some bats, some species of owls and other species of birds. Moths also are eaten by some species of lizards, amphibians, cats, dogs, rodents, and some bears. Moth larvae are vulnerable to being parasitized by Ichneumonidae.
Baculoviruses are parasite double-stranded DNAinsect viruses that are used mostly as biological control agents. They are members of the Baculoviridae, a family that is restricted to insects. Most baculovirus isolates have been obtained from insects, in particular from Lepidoptera.
There is evidence that ultrasound in the range emitted by bats causes flying moths to make evasive maneuvers. Ultrasonic frequencies trigger a reflex action in the noctuid moth that causes it to drop a few centimeters or inches in its flight to evade attack,[18] and tiger moths can emit clicks to foil bats' echolocation.[19][20]
Moths, like butterflies, bees and other more popularly recognized pollinating insects, serve an essential role as pollinators for many flowering plants, including species that bees do not visit. Nocturnal moths fly from flower to flower to feed on nectar during the night much as their diurnal relatives do during the day. A study conducted in the UK found moths dusted with pollen from 47 different plant species, including seven species largely ignored by bees.[22] Some studies indicate that certain species of moths, such as those belonging to the families Erebidae and Sphingidae, may be the key pollinators for some flowering plants in the Himalayan ecosystem.[23][24] The roles of moths as pollinators have been studied less frequently than those of diurnal pollinators, but recent studies have established that moths are important, but often overlooked, nocturnal pollinators of a wide range of plants.[25][26][27][28] Some researchers say it is likely that many plants thought to be dependent on bees for pollination also rely on moths, which have historically been less observed because they pollinate mainly at night. [29]
Attraction to light
Assorted moths in the University of Texas Insect Collection
Moths frequently appear to circle artificial lights. The reason for this behavior (positive phototaxis) is currently unknown. One hypothesis is called celestial or transverse orientation. By maintaining a constant angular relationship to a bright celestial light, such as the moon, they can fly in a straight line. Celestial objects are so far away that, even after travelling great distances, the change in angle between the moth and the light source is negligible; further, the moon will always be in the upper part of the visual field, or on the horizon. When a moth encounters a much closer artificial light and uses it for navigation, the angle changes noticeably after only a short distance, in addition to being often below the horizon. The moth instinctively attempts to correct by turning toward the light, thereby causing airborne moths to come plummeting downward, and resulting in a spiral flight path that gets closer and closer to the light source.[30]
Studies have found that light pollution caused by increasing use of artificial lights has either led to a severe decline in moth population in some parts of the world[31][32][33] or has severely disrupted nocturnal pollination.[34][35]
Noteworthy moths
Atlas moth (Attacus atlas), one of the largest moths in the world
^Darby, Gene (1958). What is a Butterfly. Chicago: Benefic Press. p. 41.
^Hoyt, Cathryn. "Evolution of Moths and Butterflies". Chihuahuan Desert Nature Center. Archived from the original on 6 January 2014. Studying the evolution of butterflies and moths is challenging, since fossils are so rare. But the few Lepidopteran fossils that exist, captured in amber or compressed in fine-grained rocks, show an astonishing amount of detail. The earliest Lepidopteran fossils appear in rocks that are about 190 million years old. These tiny fragments of scaled wings and bodies clearly indicate that moths evolved before butterflies.
^Conlong, D.E. (February 1994). "A review and perspectives for the biological control of the African sugarcane stalkborer Eldana saccharina Walker (Lepidoptera: Pyralidae)". Agriculture, Ecosystems & Environment. 48 (1): 9–17. Bibcode:1994AgEE...48....9C. doi:10.1016/0167-8809(94)90070-1.
^"Table 74. Raw silk: production (including waste)". Food and Agriculture Organization of the United Nations. Archived from the original on 18 March 2008. Retrieved 2 October 2008. Table lists worldwide raw silk production 132,400 metric tonnes in 2002
^"Silk Worm Farming". Vegan Society. Archived from the original on 19 June 2008. Retrieved 2 October 2008. World Raw Silk Production in 1996 is listed as 83,670 metric tonnes
^van Langevelde, Frank; Braamburg-Annegarn, Marijke; Huigens, Martinus E.; Groendijk, Rob; Poitevin, Olivier; van Deijk, Jurriën R.; Ellis, Willem N.; van Grunsven, Roy H. A.; de Vos, Rob (4 January 2018). "Declines in moth populations stress the need for conserving dark nights". Global Change Biology. 24 (3): 925–932. Bibcode:2018GCBio..24..925V. doi:10.1111/gcb.14008. ISSN1354-1013. PMID29215778. S2CID205145880.
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