Bagworm moth

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Bagworm moths
Iphierga.jpg
Adult of an undescribed Iphierga species from Aranda (Australia)
Case moth02.jpg
"Bag" of unidentified species
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Tineoidea
Family: Psychidae
Boisduval, 1828
Diversity [1]
10 subfamilies, 241 genera and 1,350 species
Bag of Metura elongatus which can grow to more than 120 mm (4.7 in) in length Meture-Elongatus.jpg
Bag of Metura elongatus which can grow to more than 120 mm (4.7 in) in length
Bagworm moth caterpillar locomotion

The Psychidae (bagworm moths, also simply bagworms or bagmoths) are a family of the Lepidoptera (butterflies and moths). The bagworm family is fairly small, with about 1,350 species [2] described. Bagworm species are found globally, with some, such as the snailcase bagworm (Apterona helicoidella), in modern times settling continents where they are not native.

Contents

Another common name for the Psychidae is "case moths", but this is just as well used for the case-bearers (Coleophoridae). The names refer to the habits of caterpillars of these two families, which build small protective cases in which they can hide. The bagworms belong to the superfamily Tineoidea, which is a basal lineage of the Ditrysia (as is Gelechioidea, which includes case-bearers). This means that the bagworms and case-bearers are only as closely related to each other as either is to butterflies (Rhopalocera).

Most bagworms are inoffensive to humans and inconspicuous; some are occasional nuisance pests. However, a few species can become more serious pests, and have caused significant damage e.g. to wattle (Acacia mearnsii) in South Africa and orange (Citrus × sinensis) in Florida. If detected early, picking the cases from the trees while in their pupa stage is an effective way to check an infestation; otherwise, insecticides are used. One bagworm species, the fangalabola (Deborrea malgassa) of Madagascar, is in some places encouraged to breed on wattle trees, because its pupae are collected as a protein-rich food.

Description

The caterpillar larvae of the Psychidae construct cases out of silk and environmental materials such as sand, soil, lichen, or plant materials. These cases are attached to rocks, trees or fences while resting or during their pupa stage, but are otherwise mobile. The larvae of some species eat lichen, while others prefer green leaves. In many species, the adult females lack wings and are therefore difficult to identify accurately. Case-bearer cases are usually much smaller, flimsier, and consist mainly of silk, while bagworm "bags" resemble caddisfly cases in their outward appearance a mass of (mainly) plant detritus spun together with silk on the inside.

Bagworm cases range in size from less than 1 cm to 15 cm among some tropical species. Each species makes a case particular to its species, making the case more useful to identify the species than the creature itself. Cases among the more primitive species are flat. More specialized species exhibit a greater variety of case size, shape, and composition, usually narrowing on both ends. The attachment substance used to affix the bag to host plant, or structure, can be very strong, sometimes requiring a great deal of force to remove.[ citation needed ] Body markings are rare. Adult females of many bagworm species are larviform, with only vestigial wings, legs, and mouthparts. In some species, parthenogenesis is known. The adult males of most species are strong fliers with well-developed wings and feathery antennae but survive only long enough to reproduce due to underdeveloped mouthparts that prevent them from feeding. Most male bagworm wings have few of the scales characteristic of most moths, instead having a thin covering of hairs.

Ecology

In the larval stage, bagworms extend their head and thorax from their mobile case to devour the leaves of host plants, often leading to the death of their hosts. Trees infested with bagworms exhibit increasingly damaged foliage as the infestation increases until the leaves are stripped bare.[ citation needed ] Some bagworms are specialized in their host plants (monophagous), while others can feed on a variety of plant species (polyphagous). A few species also consume small arthropods (such as the camphor scale Pseudaonidia duplex , a scale insect).[ citation needed ] One bagworm species was found to eat an orb-web of Plebs sachalinensis (Araneae, Araneidae) entirely. [3]

Since bagworm cases are composed of silk and the materials from their habitat, they are naturally camouflaged from predators. Predators include birds and other insects. Birds often eat the egg-laden bodies of female bagworms after they have died. Since the eggs are very hard-shelled, they can pass through the bird's digestive system unharmed, promoting the spread of the species over wide areas. [4]

A bagworm begins to build its case as soon as it hatches. Once the case is built, only adult males ever leave the case, never to return, when they take flight to find a mate. Bagworms add material to the front of the case as they grow, excreting waste materials through the opening in the back of the case. When satiated with leaves, a bagworm caterpillar secures its case and pupates.[ citation needed ] The adult female, which is wingless, either emerges from the case long enough for breeding or remains in the case while the male extends his abdomen into the female's case to breed. [5] Females lay their eggs in their case and die. The female evergreen bagworm (Thyridopteryx ephemeraeformis) dies without laying eggs, and the larval bagworm offspring emerge from the parent's body. Some bagworm species are parthenogenetic, meaning their eggs develop without male fertilization. Each bagworm generation lives just long enough as adults to mate and reproduce in their annual cycle. [6]

Systematics

Ten subfamilies [1] and about 240 genera are recognized among the bagworms.

The subfamilies of Psychidae, with some notable genera and species also listed, are:

Related Research Articles

<span class="mw-page-title-main">Lepidoptera</span> Order of insects including moths and butterflies

Lepidoptera or lepidopterans is an order of winged insects that includes butterflies and moths. About 180,000 species of the Lepidoptera have been described, representing 10% of the total described species of living organisms, making it the second largest insect order with 126 families and 46 superfamilies. and one of the most widespread and widely recognizable insect orders in the world.

<span class="mw-page-title-main">Evergreen bagworm</span> Species of moth

The evergreen bagworm, commonly known as bagworm, eastern bagworm, common bagworm, common basket worm, or North American bagworm, is a moth that spins its cocoon in its larval life, decorating it with bits of plant material from the trees on which it feeds.

<span class="mw-page-title-main">Luna moth</span> Species of insect

The luna moth, also called the American moon moth, is a Nearctic moth in the family Saturniidae, subfamily Saturniinae, a group commonly named the giant silk moths.

<i>Attacus atlas</i> Species of moth

Attacus atlas, the Atlas moth, is a large saturniid moth endemic to the forests of Asia. The species was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.

<span class="mw-page-title-main">Saturniidae</span> Family of moths

Saturniidae, members of which are commonly named the saturniids, is a family of Lepidoptera with an estimated 2,300 described species. The family contains some of the largest species of moths in the world. Notable members include the emperor moths, royal moths, and giant silk moths.

<i>Antheraea polyphemus</i> Species of moth

Antheraea polyphemus, the Polyphemus moth, is a North American member of the family Saturniidae, the giant silk moths. It is a tan-colored moth, with an average wingspan of 15 cm (6 in). The most notable feature of the moth is its large, purplish eyespots on its two hindwings. The eyespots give it its name – from the Greek myth of the cyclops Polyphemus. The species was first described by Pieter Cramer in 1776. The species is widespread in continental North America, with local populations found throughout subarctic Canada and the United States. The caterpillar can eat 86,000 times its weight at emergence in a little less than two months. Polyphemus moths are considered to be very polyphagous, meaning they eat from a wide variety of plants.

The wattle bagworm is a species of moth in the family Psychidae. In southern Africa it is a pest of the black wattle which is grown largely as a source of vegetable tannin. Kotochalia junodi is indigenous to Southern Africa, where it originally fed on indigenous relatives of the wattle.

Eumeta crameri is a bagworm moth of the family Psychidae. It was described by John O. Westwood in 1854 and has worldwide distribution in tropical and subtropical habitats, including India, Bangladesh, Sri Lanka, New Zealand and Puerto Rico.

<span class="mw-page-title-main">Coleophoridae</span> Family of moths

The Coleophoridae are a family of small moths, belonging to the huge superfamily Gelechioidea. Collectively known as case-bearers, casebearing moths or case moths, this family is represented on all continents, but the majority are found in temperate areas of the Northern Hemisphere. They are most common in the Palearctic, and rare in sub-Saharan Africa, South America, and Australia; consequently, they probably originated in northern Eurasia. They are relatively common in houses, they seek out moist areas to rest and procreate.

<i>Phereoeca uterella</i> Species of moth

Phereoeca uterella, known by the vernacular names plaster bagworm and household casebearer, is a moth species in family Tineidae. It occurs in tropical climates, where it is common in houses, and is presumed native to the Neotropical realm. In the Americas, it has been recorded from Brazil, Guyana, and the southern United States as well as the Virgin Islands and Trinidad, and tentatively identified from Tobago.

<i>Abantiades latipennis</i> Species of moth

Abantiades latipennis, known as the Pindi moth, is a species of moth in the family Hepialidae. It may also be referred to as a swift moth or a ghost moth, as this is a common name associated with Hepialidae. Endemic to Australia and identified in 1932, it is most populous in temperate rainforest where eucalypti are prevalent, as the larvae feed primarily on the roots of these trees. Females lay eggs during flight in a scattering fashion. The larvae live for over eighteen months underground, while adult moths survive for approximately one week, as they have no mouthparts with which to feed. The moths are preyed upon by a number of predators, including bats and owls. Brown in colour overall, males are paler and the identifying silver bars of the male's wings are more prominent than those of the female's, with dark margins. Male adults are generally smaller.

<span class="mw-page-title-main">External morphology of Lepidoptera</span> External features of butterflies and moths

The external morphology of Lepidoptera is the physiological structure of the bodies of insects belonging to the order Lepidoptera, also known as butterflies and moths. Lepidoptera are distinguished from other orders by the presence of scales on the external parts of the body and appendages, especially the wings. Butterflies and moths vary in size from microlepidoptera only a few millimetres long, to a wingspan of many inches such as the Atlas moth. Comprising over 160,000 described species, the Lepidoptera possess variations of the basic body structure which has evolved to gain advantages in adaptation and distribution.

<i>Apterona helicoidella</i> Species of moth

Apterona helicoidella is a moth of the Psychidae family. It is widely distributed in Europe, from Portugal through most of central Europe and the Alps up to the Ural. It is also found in the Balkan and Turkey. It was introduced in the United States by accident during the 1940s. It is now found in many mid-Atlantic states, including Pennsylvania, and has also been reported in the Pacific coastal states, Colorado, Michigan, Nevada, Utah and Idaho. It has also been collected in Ontario.

<i>Metura</i> Genus of moths

Metura is a genus of bagworm or case moths in the family Psychidae, endemic to Oceania. The genus contains the largest species of Psychidae known, M. aristocosma, with a larval bag of up to 300 mm and an adult male wingspan of 60 mm.

<i>Liothula omnivora</i> Species of moth

Liothula omnivora, the common bag moth, is a psychid moth endemic to New Zealand. It is also known by several Māori vernacular names like the tūngou ngou,< whare atua or kopi ('shut').

Eumeta variegata, commonly known as the paulownia bagworm or cotton bag worm, is a moth of the family Psychidae. The species was first described by Snellen in 1879. It is found in Japan, Papua New Guinea, India, the Solomon Islands and Sri Lanka.

<i>Metisa plana</i> Worms that eat oilpalms - a "bagworm"

Metisa plana is a moth of the family Psychidae first described by Francis Walker in 1883. It is found in Sumatra, Malaysia and Sri Lanka. It is a major pest on Elaeis guineensis, the African oil palm.

<i>Pteroma plagiophleps</i> Species of moth

Pteroma plagiophleps is a moth of the family Psychidae first described by George Hampson in 1892. It is found in India, Bangladesh, Sri Lanka, and Indonesia.

Mahasena corbetti, the coconut case caterpillar, is a polyphagous species of bagworm. This species is classified as leaf-eating pest caterpillars that produce tough silk out of their bags from dried foliage. Currently, M. corbetti is considered a 'pest of quarantine importance' in multiple countries and is included on the list of dangerous pests in the Malaysian plant quarantine act.

Pteroma pendula, the oil palm bagworm or simply bagworm, is a species of bagworm moth found in East and Southeast Asia that infests oil palm plantations.

References

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