Evolution and Systematics

Functional Adaptations

Functional adaptation

Antennae used to detect pheromones, find mates: moths
 

Highly sensitive antennae of many moths help them detect female sex pheromones thanks to many hairlike olfactory receptors.

     
  "Certain types of moth have an olfactory sensitivity that verges on the supernatural. They can detect a single molecule of the female sex hormone from miles away. Males of the saturniid, bombycid, and lasiocampid families of moth, which include luna, emperor, polyphemus, vaporer, and silk moths, have large, feathery antennae that bear the moths' hairlike olfactory receptors in great quantities (as many as 60,000 in some species). Thanks to their broad shape, the antennae come into contact with the largest possible volume of air, making them perfect scent receivers." (Shuker 2001:28)

"The females of some moths produce an odour that the males can detect with large feathery antennae. So sensitive are these organs and so characteristic and powerful is the scent, that a female has been known to summon a male from eleven kilometres away. At such a distance there must be as little as one molecule of scent in a cubic yard of air, yet it is sufficient to cause the male to fly in pursuit of its source. He needs both antennae to do this. With only one, he cannot establish direction, but with two he can judge on which side the scent is stronger and so fly steadily towards it. A female emperor moth, in a cage in a wood, transmitting a perfume undetectable to our nostrils, has attracted over a hundred huge males from the surrounding countryside within three hours." (Attenborough 1979:96)
  Learn more about this functional adaptation.
  • Shuker, KPN. 2001. The Hidden Powers of Animals: Uncovering the Secrets of Nature. London: Marshall Editions Ltd. 240 p.
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Functional adaptation

Antennae enhance odor detection: giant silkworm moths
 

The antennae of silkworm moths increase sensitivity to odors because the shape and structure of sensillae direct air flow through them.

   
  "Females [giant silkworm moths] attract males for mating by releasing a volatile attractant chemical, but these moths typically live at very low population densities. Males have equipment to smell out females at distances of miles- large, feather-shaped antennae (fig. 6.5) on which some 70 percent of the sensilla are sensitive to nothing other than the females' perfume- truly an olfactory sensation. A nineteenth-century French entomologist, Jean Henri Fabre, did a few experiments on the phenomenon but still could not belive that any sense of smell could work so well (Teale 1949)!

"In order for an odorant to be picked up from the airstream, air must be made to pass through an antenna." (Vogel 2003:124-125)
  Learn more about this functional adaptation.
  • Steven Vogel. 2003. Comparative Biomechanics: Life's Physical World. Princeton: Princeton University Press. 580 p.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:49,546Public Records:13,218
Specimens with Sequences:44,564Public Species:1,602
Specimens with Barcodes:42,184Public BINs:1,597
Species:3,669         
Species With Barcodes:3,438         
          
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Barcode data

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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Saturniidae

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Wikipedia

Saturniidae

The family Saturniidae, commonly known as saturniids, by most measures include the largest species of moths. They are a family of Lepidoptera, with an estimated 2,300 described species worldwide.[1] The Saturniidae include such Lepidoptera as the giant silkmoths, royal moths and emperor moths.

Adults are characterized by large size, heavy bodies covered in hair-like scales, lobed wings, reduced mouthparts, and small heads. They lack a frenulum but the hind wings overlap the forewings, producing the same effect of an unbroken wing surface.[2] These moths 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 possess wingspans between 1 to 6 inches (2.5 to 15 cm), but some tropical species, such as the Atlas Moth (Attacus atlas), may have wingspans of up to 12 inches (30 cm). Together with certain Noctuidae (chiefly Calpinae and Catocalinae, such as the genera Ascalapha, Erebus or Thysania), the Saturniidae contain the largest Lepidoptera, and some of the largest insects alive today.

Distribution[edit]

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. There are approximately one dozen described species living in Europe, one of which, the Emperor Moth, occurs in the British Isles, and 68 described species living in North America, 42 of which reside north of Mexico and Southern California...

Life cycle[edit]

Some saturniids produce 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 that day length during the larvae's 5th instar plays a major role. 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 – e.g. the Luna Moth (Actias luna) or Callosamia securifera (both Saturniinae) –, spring and summer broods look different, with different genes activated by environmental conditions.[2]

Eggs[edit]

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

Larvae[edit]

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 colourful. Some have stinging hairs.[3] A few species have been noted to produce clicking sounds with the larval mandibles when disturbed (e.g. Saturniini like Actias luna and Polyphemus Moth, Antheraea polyphemus). It has been hypothesized that the clicks 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] those of Lonomia containing a poison which may kill a human. A. armida is another well-known example, and are infamous for their 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 there is a wandering stage, and the caterpillar may change colour, becoming more cryptic just before this stage.[2]

Luna Moth (Actias luna, Saturniinae) pupa (right) removed from cocoon (left, note last larval skin)

Pupae[edit]

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 most 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, pupae undergo metamorphosis.

Adults[edit]

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 featherlike antennae. The males will 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.

Importance to humans[edit]

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). However, the corn earworm moth is a major agricultural pest.[5]

Many species of Saturniidae are a valuable food source for man in sub-Saharan Africa, examples being the 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]

Caterpillars of the genus Lonomia produce a deadly toxin injected into the victim when it is touched. [10]

Most Saturniidae are harmless animals at least as adults, and in many cases at all stages of their life. 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.

Systematics and evolution[edit]

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 flew around 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 one. Some notable genera and species are also included.

Male Citheronia splendens (Ceratocampinae)

Footnotes[edit]

  1. ^ van Nieukerken et al. (2011). "Order Lepidoptera Linnaeus, 1758. In: Zhang, Z.-Q. (Ed.) Animal biodiversity: An outline of higher-level classification and survey of taxonomic richness". Zootaxa 3148: 212–221. 
  2. ^ a b c d e f g Tuskes et al. (1996)
  3. ^ a b Scoble (1995)
  4. ^ Brown et al. (2007)
  5. ^ Fitt, G.P. (1989) The ecology of Heliothis species in relation to agro-ecosystems. Annual Review of Entomology 34, 17-52.
  6. ^ "Edible insects: future prospects for food and feed security" - van Huis et al. (2013)
  7. ^ "Food Insects Newsletter"
  8. ^ "Food Insects"
  9. ^ "Insects as food in Sub-Saharan Africa" - A. van Huis
  10. ^ More Media Coverage. "Caterpillar-induced bleeding syndrome in a returning traveller". Cmaj.ca. Retrieved 2011-10-18. 

References[edit]

Further reading[edit]

  • Burnie, David (2001). Smithsonian: Animal (1st American ed.). DK Publishing Inc., 375 Hudson St. New York, NY 10014.
  • Mitchell, Robert T. (2002). Butterflies and Moths: A Golden Guide From St. Martin's Press. St. Martin's Press, New York.
  • Racheli, L. & Racheli, T. (2006): The Saturniidae Fauna of Napo Province, Ecuador: An Overview (Lepidoptera: Saturniidae). SHILAP Revista de Lepidopterología 34(134): 125-139. PDF fulltext (inventory of about 200 Saturniidae taxa)
  • Lampe, Rudolf E. J. (2010) Saturniidae of the World – Pfauenspinner der WeltTheir Life Stages from the Eggs to the Adults -Ihre Entwicklungsstadien vom Ei zum Falter [English and German] ISBN 978-3-89937-084-3
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