Saturniidae

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Saturniidae
Saturnia pavonia 01.jpg
Male small emperor moth, Saturnia pavonia (Saturniinae)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Bombycoidea
Family: Saturniidae
Subfamilies

Saturniidae, members of which are commonly named the saturniids, is a family of Lepidoptera with an estimated 2,300 described species. [1] 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 (or wild silk moths).

Contents

Adults are characterized by large, lobed wings, heavy bodies covered in hair-like scales, and reduced mouthparts. They lack a frenulum, but the hindwings overlap the forewings to produce the effect of an unbroken wing surface. [2] Saturniids are sometimes brightly colored and often have translucent eyespots or "windows" on their wings. Sexual dimorphism varies by species, but males can generally be distinguished by their larger, broader antennae.

Most adults have wingspans between 1–6 in (2.5–15.2 cm), but some tropical species such as the Atlas moth ( Attacus atlas ) may have wingspans up to 12 in (30 cm). Together with certain Noctuidae, Saturniidae contains the largest Lepidoptera and some of the largest extant insects.

Distribution

Marbled emperor moth (Heniocha dyops) in Botswana Marbled emperor moth heniocha dyops.jpg
Marbled emperor moth ( Heniocha dyops ) in Botswana

The majority of saturniid species occur in wooded tropical or subtropical regions, with the greatest diversity in the New World tropics and Mexico, [2] though they are found all over the world. About 12 described species live in Europe, one of which, the emperor moth, occurs in the British Isles, and 68 described species live in North America, 42 of which reside north of Mexico and Southern California.

Life cycle

Life stages of giant emperor moth (Saturnia pyri) Great Peacock Moth.jpg
Life stages of giant emperor moth ( Saturnia pyri )

Some saturniids are strictly univoltine, producing only one generation a year, whereas others are multivoltine, producing more than one brood a year. Spring and summer broods hatch in a matter of weeks; autumn broods enter a state known as diapause and emerge the following spring. How the pupae know when to hatch early or hibernate is not yet fully understood, though research suggests day length during the fifth larval instar plays a major role, as well as cooling temperatures. Longer days may prompt pupae to develop early, while shorter days result in pupal diapause. The number of broods is flexible, and a single female may produce both fast-developing and slow-developing individuals, or they may produce different numbers of broods in different years or parts of the range. [2] In some species, the spring and summer broods look different from each other; for example, the two Saturniinae species Actias luna (the Luna moth) and Callosamia securifera both have certain genes which may or may not be activated depending upon differences in environmental conditions. [2]

Eggs

Clutch of emperor gum moth (Opodiphthera eucalypti) eggs Emperor Gum Moth eggs2.jpg
Clutch of emperor gum moth ( Opodiphthera eucalypti ) eggs

Depending on the moth, a single female may lay up to 200 eggs on a chosen host plant. Others are laid singly or in small groups. [3] They are round, slightly flattened, smooth, and translucent or whitish.

Larvae

Citheronia laocoon fifth-instar caterpillar in Brazil Lagarta2.jpg
Citheronia laocoon fifth-instar caterpillar in Brazil

Saturniid caterpillars are large (50 to 100 mm in the final instar), stout, and cylindrical. Most have tubercules that are often also spiny or hairy. Many are cryptic in coloration, with countershading or disruptive coloration to reduce detection, but some are more colorful. Some have urticating hairs. [3] A few species have been noted to produce clicking sounds with the larval mandibles when disturbed. Examples: Luna moth ( Actias luna ) and Polyphemus moth ( Antheraea polyphemus ). The clicks may serve as aposematic warning signals to a regurgitation defense. [4]

Most are solitary feeders, but some are gregarious. The Hemileucinae are gregarious when young and have stinging hairs, [2] and those of Lonomia contain a poison that may kill a human. Arsenura armida is another well-known example and is infamous for its large conspicuous masses during the day. Their coloration is not cryptic, instead exhibiting aposematism.

The other caterpillars in this size range are almost universally Sphingidae, which are seldom hairy and tend to have diagonal stripes on their sides. Many Sphingidae caterpillars bear a single curved horn on their hind end. These are actually not dangerous, but large-haired caterpillars should generally not be touched except by experts.

Most saturniid larvae feed on the foliage of trees and shrubs. A few, particularly Hemileucinae such as Automeris louisiana , A. patagonensis , and Hemileuca oliviae , feed on grasses. They moult at regular intervals, usually four to six times before entering the pupal stage. Prior to pupation, a wandering stage occurs, and the caterpillar may change color, becoming more cryptic just before this stage. [2]

Luna moth (Actias luna, Saturniinae) pupa (right) removed from cocoon (left, note last larval skin) Actias luna pupa 2 sjh.JPG
Luna moth (Actias luna, Saturniinae) pupa (right) removed from cocoon (left, note last larval skin)

Pupae

Most larvae spin a silken cocoon in the leaves of a preferred host plant or in leaf litter on the ground, or crevices in rocks and logs. While only moderately close relatives to the silkworm ( Bombyx mori ) among the Lepidoptera, the cocoons of larger saturniids can be gathered and used to make silk fabric. However, larvae of some species typically Ceratocampinae, like the regal moth ( Citheronia regalis ) and the imperial moth ( Eacles imperialis ), burrow and pupate in a small chamber beneath the soil. This is common in the Ceratocampinae and Hemileucinae. Unlike most silk moths, those that pupate underground do not use much silk in the construction. [2] Once enclosed in the cocoon, the caterpillar sheds the larval skin and becomes a pupa, and the pupa undergoes metamorphosis for about 14 days, at which point it either emerges or goes into diapause. During metamorphosis, the respiratory system will stay intact, the digestive system will dissolve, and reproductive organs will take form.

Adults

Adult females emerge with a complete set of mature ova and "call" males by emitting pheromones (specific "calling" times vary by species). Males can detect these chemical signals up to a mile away with help from sensitive receptors located on the tips of their feather-like antennae. The males fly several miles in one night to locate a female and mate with her; females generally will not fly until after they have mated.

Since the mouthparts of adult saturniids are vestigial and digestive tracts are absent, adults subsist on stored lipids acquired during the larval stage. As such, adult behavior is devoted almost entirely to reproduction, but the end result (due to lack of feeding) is a lifespan of a week or less once emerged from the pupa[ citation needed ].

One specific species in the family Saturniidae with a special mating pattern is Callosamia promethea (promethea silkmoth). Females will mate with multiple males and males will mate with multiple females. Females that mate with more than one male will produce 10% more eggs. [5]

Importance to humans

Typical example of Saturniidae camouflage, Eacles imperialis (imperial moth), next to a nearly identical yellow poplar (Liriodendron tulipifera) leaf Imperial-moth-camouflaged-with-leaf.jpg
Typical example of Saturniidae camouflage, Eacles imperialis (imperial moth), next to a nearly identical yellow poplar (Liriodendron tulipifera) leaf

A few species are important defoliator pests, including the orange-striped oakworm moth ( Anisota senatoria ) on oaks, the pandora pinemoth ( Coloradia pandora ) on pines and Hemileuca oliviae on range grasses.

Other species are of major commercial importance in tussah and wild silk production. These notably include the Chinese tussah moth ( Antheraea pernyi ), its hybridogenic descendant Antheraea × proylei, and the ailanthus silkmoth ( Samia cynthia ). Mopane worm ( Gonimbrasia belina ), Gonimbrasia zambesina , the cabbage tree emperor moth ( Bunaea alcinoe ), Gynanisa maia , Imbrasia epimethea , Imbrasia oyemensis , Melanocera menippe , Microgone cana , Urota sinope and the pallid emperor moth ( Cirina forda ). [6] [7] [8] [9]

Some species of Saturniidae such as the mopane worm ( Gonimbrasia belina ) are used as a food source. [10]

Most Saturniidae are harmless animals at least as adults, and in many cases at all stages of their lives. Thus, some of the more spectacular species in particular Antheraea can be raised by children or school classes as educational pets. The soft, silken cocoons make an interesting keepsake for pupils.

Some, including the genus Automeris , have urticating spines that sting.

Caterpillars of the genus Lonomia produce a deadly toxin injected into the victim when it is touched. [11]

Systematics and evolution

In terms of absolute numbers of species, the Saturniidae are most diverse in the Neotropics. Also, their most ancient subfamilies occur only in the Americas. Only the very "modern" Saturniidae are widely distributed across most parts of the world. Thus, it is quite safe to assume even in the absence of a comprehensive fossil record that the first Saturniidae originated in the Neotropical region. Note that at least two of the subfamilies included below are commonly treated as separate families (Oxyteninae and Cercophaninae).

The following list arranges the subfamilies in the presumed phylogenetic sequence, from the most ancient to the most advanced.

Giant Peacock Moth On Arum by Vincent van Gogh, 1889. A painting with Saturnia pyri, a saturniid moth, as motif. Grote nachtpauwoog - s0189V1962 - Van Gogh Museum.jpg
Giant Peacock Moth On Arum by Vincent van Gogh, 1889. A painting with Saturnia pyri , a saturniid moth, as motif.

See also

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.

A common classification of the Lepidoptera involves their differentiation into butterflies and moths. Butterflies are a natural monophyletic group, often given the suborder Rhopalocera, which includes Papilionoidea, Hesperiidae (skippers), and Hedylidae. In this taxonomic scheme, moths belong to the suborder Heterocera. Other taxonomic schemes have been proposed, the most common putting the butterflies into the suborder Ditrysia and then the "superfamily" Papilionoidea and ignoring a classification for moths.

<span class="mw-page-title-main">Moth</span> Group of mostly-nocturnal insects in the order Lepidoptera

Moths are a group of insects that includes all members of the order Lepidoptera that are not butterflies. They were previously classified as suborder Heterocera, but the group is paraphyletic with respect to butterflies 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, many of which have yet to be described. Most species of moth are nocturnal, although there are also crepuscular and diurnal species.

<span class="mw-page-title-main">Pupa</span> Life stage of some insects undergoing transformation

A pupa is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their life cycle, the stages thereof being egg, larva, pupa, and imago. The processes of entering and completing the pupal stage are controlled by the insect's hormones, especially juvenile hormone, prothoracicotropic hormone, and ecdysone. The act of becoming a pupa is called pupation, and the act of emerging from the pupal case is called eclosion or emergence.

<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">Lasiocampidae</span> Family of moths

The Lasiocampidae are a family of moths also known as eggars, tent caterpillars, snout moths, or lappet moths. Over 2,000 species occur worldwide, and probably not all have been named or studied. It is the sole family in superfamily Lasiocampoidea.

<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.

<i>Anisota senatoria</i> Species of moth

Anisota senatoria, the orangestriped oakworm, also known as the orange-tipped oakworm, is a Nearctic moth of the family Saturniidae and subfamily Ceratocampinae. It is one of the more common Saturniids, reaching pest status occasionally in the northern parts of its range. As they are late-season feeders, however, they do little lasting damage to their hosts. It is very similar to A. finlaysoni in southern Ontario and A. peigleri in the southern US. The species was first described by James Edward Smith in 1797.

<span class="mw-page-title-main">Malaysian moon moth</span> Species of moth

The Malaysian moon moth is a Saturniid in the subfamily Saturniinae from Indomalaya. The male is purplish-brown and yellow, while the larger female is overall light green.

<span class="mw-page-title-main">Saturniinae</span> Subfamily of moths

The Saturniinae or saturniines are a subfamily of the family Saturniidae, also known as giant silkmoths. They are commonly known as emperor moths or wild silk moths. They are easily spotted by the eyespots on the upper surface of their wings. Some exhibit realistic eye-like markings, whilst others have adapted the eyespots to form crescent moon or angular shapes or have lost their wing scales to create transparent windows. They are medium to very large moths, with adult wingspans ranging from 7.5 to 15 cm, in some cases even more. They consist of some of the largest sized Lepidoptera, such as the luna moth, atlas moth, and many more. The Saturniinae is an important source of wild silk and human food in many different cultures.

<i>Callosamia promethea</i> Species of moth

Callosamia promethea, commonly known as the promethea silkmoth, is a member of the family Saturniidae, which contains approximately 1,300 species. It is also known as the spicebush silkmoth, which refers to is one of the promethea silkmoth's common host plants, spicebush. C. promethea is classified as a silk moth, which stems from its ability to produce silk, which it does in the formation of its cocoon. C. promethea lives in forests in the eastern U.S. and does not damage the trees on which it lives. The species was first described by Dru Drury in 1773.

<i>Citheronia sepulcralis</i> Species of moth

Citheronia sepulcralis, the pine-devil moth, is a Nearctic member of the family Saturniidae and of the subfamily Ceratocampinae. The species are blackish brown. The species was first described by Augustus Radcliffe Grote and Coleman Townsend Robinson in 1865.

<i>Eupackardia</i> Genus of moths

Eupackardia is a monotypic moth genus in the family Saturniidae erected by Theodore Dru Alison Cockerell in 1912. Its only species, Eupackardia calleta, the calleta silkmoth, was described by John O. Westwood in 1853. It is found in Mexico, Guatemala, as well as in the states such as; Arizona, New Mexico, and Texas.

<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>Antheraea assamensis</i> Species of moth

Antheraea assamensis, known as the muga silkworm as a larva and Assam silk moth as an adult, is a moth of the family Saturniidae. The species was first described by Johann Wilhelm Helfer in 1837. It is found in Assam in northeast India where 99% of its production occurs.

<i>Arsenura armida</i> Species of moth

Arsenura armida, the giant silk moth, is a moth of the family Saturniidae. It is found mainly in South and Central America, from Mexico to Bolivia, and Ecuador to south-eastern Brazil. It was first described by Pieter Cramer in 1779.

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

Antheraea pernyi, the Chinese oak tussar moth, Chinese tasar moth or temperate tussar moth, is a large moth in the family Saturniidae. The species was first described by Félix Édouard Guérin-Méneville in 1855. Antheraea roylei is an extremely close relative, and the present species might actually have evolved from ancestral A. roylei by chromosome rearrangement.

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

Antheraea paphia, known as the South India small tussore, the tasar silkworm and vanya silkworm is a species of moth of the family Saturniidae found in India and Sri Lanka. The bulk of the literature on this species uses a junior synonym, Antheraea mylitta, rather than the correct name, A. paphia. It is one of a number of tasar silkworms, species that produce Tussar silk, a kind of wild silk that is made from the products of saturniid silkworms instead of the domesticated silkworm.

<i>Rhodinia fugax</i> Species of moth

Rhodinia fugax, the squeaking silkmoth, is a moth in the family Saturniidae. It was described by Arthur Gardiner Butler in 1877. It is native to Korea, Japan, China, and the Russian Far East.

References

  1. Van Nieukerken, Erik J.; Kaila, Lauri; Kitching, Ian J.; Kristensen, Niels P.; Lees, David C.; Minet, JoëL; Mitter, Charles; Mutanen, Marko; Regier, Jerome C.; Simonsen, Thomas J.; Wahlberg, Niklas; Yen, Shen-Horn; Zahiri, Reza; Adamski, David; Baixeras, Joaquin; et al. (2011-12-23). "Order Lepidoptera Linnaeus, 1758. In: Zhang, Z.-Q. (Ed.) Animal biodiversity: An outline of higher-level classification and survey of taxonomic richness". Zootaxa. 3148 (1): 212–221. doi:10.11646/zootaxa.3148.1.41. ISSN   1175-5334.
  2. 1 2 3 4 5 6 7 Tuskes, Paul M.; Tuttle, James P.; Collins, Michael M. (1996). The wild silk moths of North America: a natural history of the Saturniidae of the United States and Canada. The Cornell series in arthropod biology. Ithaca, N.Y: Comstock Pub. Associates. pp. 182–184. ISBN   978-0-8014-3130-2.{{cite book}}: CS1 maint: date and year (link)
  3. 1 2 Scoble, Malcolm J. (1995). The lepidoptera: form, function and diversity (2 ed.). London Oxford: The Natural History Museum in association with Oxford University Press. ISBN   978-0-19-854952-9.
  4. Brown SG, Boettner GH, Yack JE (2007). "Clicking caterpillars: acoustic aposematism in Antheraea polyphemus and other Bombycoidea". The Journal of Experimental Biology. 210 (Pt 6): 993–1005. doi: 10.1242/jeb.001990 . PMID   17337712.
  5. Morton, Eugene S. (2009). "The Function of Multiple Mating by Female Promethea Moths, Callosamia promethea (Drury) (Lepidoptera: Saturniidae)". The American Midland Naturalist. 162: 7–18. doi:10.1674/0003-0031-162.1.7. S2CID   85890593.
  6. Huis, Arnold van, ed. (2013). Edible insects: future prospects for food and feed security (PDF). FAO forestry paper. Rome: Food and Agriculture Organization of the United Nations. ISBN   978-92-5-107596-8.
  7. "Food Insects Newsletter"
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  9. van Huis, A. (September 2003). "Insects as Food in sub-Saharan Africa". International Journal of Tropical Insect Science. 23 (03): 163–185. doi:10.1017/S1742758400023572. ISSN   1742-7584.
  10. Chavunduka, D.M. 1975. Insects as a source of protein to the African. Rhodesia Science News 9: 217-220. (Quoted in ch.13 DeF 2003)
  11. Chan, Kris; Lee, Adrienne; Onell, Rodrigo; Etches, Wai; Nahirniak, Susan; Bagshaw, Sean M.; Larratt, Loree M. (July 15, 2008). "Caterpillar-induced bleeding syndrome in a returning traveller". Canadian Medical Association Journal. 179 (2): 158–161. doi: 10.1503/cmaj.071844 . PMC   2443214 . PMID   18625988.

Bibliography

Further reading