Hummingbird hawk-moth

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Hummingbird hawk-moth
Hummingbird hawk moth (Macroglossum stellatarum) in flight.jpg
In flight
Macroglossum stellatarum au repos summer 2006.jpg
At rest
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Sphingidae
Genus: Macroglossum
Species:
M. stellatarum
Binomial name
Macroglossum stellatarum
Synonyms
  • Sphinx stellatarumLinnaeus, 1758
Distribution map: yellow, winter in the Northern Hemisphere; green, year round; blue, summer in the Northern Hemisphere Distribution map Macroglossum stellatarum.svg
Distribution map: yellow, winter in the Northern Hemisphere; green, year round; blue, summer in the Northern Hemisphere

The hummingbird hawk-moth (Macroglossum stellatarum) is a species of hawk moth found across temperate regions of Eurasia. The species is named for its similarity to hummingbirds, as they feed on the nectar of tube-shaped flowers using their long proboscis while hovering in the air; this resemblance is an example of convergent evolution.

Contents

The hummingbird hawk-moth was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. As of 2018, its entire genome and mitogenome have been sequenced. [1]

Distribution

The hummingbird hawk-moth is distributed throughout the northern Old World from Portugal to Japan, but it breeds mainly in warmer climates (southern Europe, North Africa, and points east). Three generations are produced in a year in Spain. [2]

It is a strong flier, dispersing widely in the summer. [3] However it rarely survives the winter in northern latitudes (e.g. north of the Alps in Europe, north of the Caucasus in Russia).

Moths in the genus Hemaris , also of the family Sphingidae, are known as "hummingbird moths" in the US, and "bee moths" in Europe.[ citation needed ] [4] This sometimes causes confusion between this species and the North American genus.

Life cycle

Two or more broods are produced each year. The adult may be encountered at any time of the year, especially in the south of the range, where there may be three or four broods. It overwinters as an adult in a crevice among rocks, trees, and buildings. [5] On very warm days it may emerge to feed in mid-winter. Unlike other moths, they have no sexual dimorphism in the size of their antennal lobes. [6]

Ova

The glossy pale green ova (eggs) are spherical with a 1-millimetre (0.04 in) diameter. They are said to look like the flower buds of the host plant Galium , and that is where the female lays them. They hatch 6 to 8 days after laying. [5] Up to 200 eggs may be laid by one female, each on a separate plant.

Larvae

Newly hatched larvae are clear yellow, and in the second instar assume their green coloration. The larva is green with two grey stripes bordered in cream along the sides and with a horn at the rear end typical of sphingids. The horn is purplish red, changing to blue with an orange tip in the last instar. [5] They feed fully exposed on the top of the host plant and rest in among a tangle of stems. Although dependent on warmth and sun, the larval stage can be as rapid as 20 days.

Pupae

The pupae are pale brownish with a prominent, keeled proboscis, and two sharp spines at the end of the cremaster. They are enclosed in loose silken cocoons among the host plant debris or on the ground among leaf litter. [5]

Adults

The forewings are brown, with black wavy lines across them, while the hindwings are orange with a black edge. The abdomen is quite broad, with a fan-tail of setae at the end. The wingspan is 40–45 millimetres (1.6–1.8 in).

In the southern parts of its range, the hummingbird hawk-moth is highly active even when temperatures are high, and thoracic temperatures above 45 °C (113 °F) have been measured. [7] This is among the highest recorded for hawk-moths, and near the limit for insect muscle activity.

Behaviour

Its long proboscis (25–28 mm (1.0–1.1 in)) [8] and its hovering behavior, accompanied by an audible humming noise, make it look remarkably like a hummingbird while feeding on flowers. Like hummingbirds, it feeds on flowers which have tube-shaped corollae. [8] It should not be confused with the moths called hummingbird moths in North America, genus Hemaris , members of the same family and with similar appearance and behavior. The resemblance to hummingbirds is an example of convergent evolution. It flies during the day, especially in bright sunshine, but also at dusk, [7] dawn, and even in the rain, which is unusual for even diurnal hawkmoths. [5] M. stellatarum engages in free hovering flight, which allows more maneuverability and control than fixed-wing flight, despite high energetic cost. [9] [6] Like many large insects, it relies upon Johnston's organs for body positioning information. [10]

Vision

Nectaring process on Buddleja (5 frames/second) Macroglossum stellatarum on flowers - nectaring process.png
Nectaring process on Buddleja (5 frames/second)

The hummingbird hawkmoth's visual abilities have been studied extensively, and they have demonstrated a relatively good ability to learn colours. [11] They have a trichromatic visual system, and are most sensitive to wavelength in the range of 349-521 nm. They have been shown to discriminate a wavelength difference as small as 1–2 nm between sources. This discrimination is even more precise than Apis mellifera , or the western honey bee. Among other flower visitors, their visual system is similar to Papilio xuthus , or the Asian swallowtail butterfly, and Deilephila elpenor , the nocturnal elephant hawkmoth. [12] [6] Their food preference is based mainly on visual identification, while D. elpenor preference relies upon olfactory identification. [6] Compared to D. elpenor, M. stellatarum have a much smaller number of ommatidia, but a larger optic lobe volume to provide more visual processing tissue. [6]

Habitat and host plants

One of the preferred habitats of M. stellatarum (woodland edge with red valerian) Sphingidae - Macroglossum stellatarum - Habitat.JPG
One of the preferred habitats of M. stellatarum (woodland edge with red valerian)

Hummingbird hawk-moths can be easily seen in gardens, parks, meadows, bushes, and woodland edge, where the preferred food plants grow (honeysuckle, red valerian and many others). [13]

Their larvae usually feed on bedstraws or madders (Rubia) but have been recorded on other Rubiaceae and Centranthus , Stellaria , and Epilobium . [5]

Adults are particularly fond of nectar-rich flowers with a long and narrow calyx, since they can then take advantage of their long proboscis and avoid competition from other insects. [5] Flowers with longer tubes typically present the feeding animal a higher nectar reward. [14] Proboscis length is thought to have been evolutionarily impacted by the length of flower feeding tubes. [14] Examples of such plants include Centranthus , Jasminum , Buddleia , Nicotiana , Primula , Viola , Syringa , Verbena , Echium , Phlox , and Stachys . [5] They are reported to trap-line, that is, to return to the same flower beds at about the same time each day.

In culture

Hummingbird hawk-moths have been seen as a lucky omen. In particular, a swarm of the moths was seen flying across the English Channel on D-Day, the day of the Normandy landings in the Second World War. [15] These moths, along with other moths, are in the family Sphingidae because their larvae were thought to resemble the Egyptian Sphinx. [16]

Related Research Articles

<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">Hummingbird</span> Family of birds

Hummingbirds are birds native to the Americas and comprise the biological family Trochilidae. With about 366 species and 113 genera, they occur from Alaska to Tierra del Fuego, but most species are found in Central and South America. About 28 hummingbird species are listed as endangered or critically endangered, with numerous species declining in population.

<span class="mw-page-title-main">Sphingidae</span> Family of insects

The Sphingidae are a family of moths commonly called sphinx moths, also colloquially known as hawk moths, with many of their caterpillars known as "hornworms"; it includes about 1,450 species. It is best represented in the tropics, but species are found in every region. They are moderate to large in size and are distinguished among moths for their agile and sustained flying ability, similar enough to that of hummingbirds as to be reliably mistaken for them. Their narrow wings and streamlined abdomens are adaptations for rapid flight. The family was named by French zoologist Pierre André Latreille in 1802.

<span class="mw-page-title-main">Proboscis</span> Elongated mouth part

A proboscis is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking. In vertebrates, a proboscis is an elongated nose or snout.

<i>Deilephila elpenor</i> Species of moth

Deilephila elpenor, the elephant hawk moth or large elephant hawk moth, is a moth in the family Sphingidae. Its common name is derived from the caterpillar's resemblance to an elephant's trunk. It is most common in central Europe and is distributed throughout the Palearctic region. It has also been introduced in British Columbia, Canada. Its distinct olive and pink colouring makes it one of the most recognisable moths in its range. However, it is quite easy to confuse the elephant hawk moth with the small elephant hawk moth, a closely related species that also shares the characteristic colours.

<span class="mw-page-title-main">Entomophily</span> Form of pollination by insects

Entomophily or insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects. Flowers pollinated by insects typically advertise themselves with bright colours, sometimes with conspicuous patterns leading to rewards of pollen and nectar; they may also have an attractive scent which in some cases mimics insect pheromones. Insect pollinators such as bees have adaptations for their role, such as lapping or sucking mouthparts to take in nectar, and in some species also pollen baskets on their hind legs. This required the coevolution of insects and flowering plants in the development of pollination behaviour by the insects and pollination mechanisms by the flowers, benefiting both groups. Both the size and the density of a population are known to affect pollination and subsequent reproductive performance.

<i>Manduca quinquemaculata</i> Species of moth

Manduca quinquemaculata, the five-spotted hawkmoth, is a brown and gray hawk moth of the family Sphingidae. The caterpillar, often referred to as the tomato hornworm, can be a major pest in gardens; they get their name from a dark projection on their posterior end and their use of tomatoes as host plants. Tomato hornworms are closely related to the tobacco hornworm Manduca sexta. This confusion arises because caterpillars of both species have similar morphologies and feed on the foliage of various plants from the family Solanaceae, so either species can be found on tobacco or tomato leaves. Because of this, the plant on which the caterpillar is found does not indicate its species.

<i>Agrius convolvuli</i> Species of moth

Agrius convolvuli, the convolvulus hawk-moth, is a large hawk-moth. It is common throughout Europe, Asia, Africa, Australia and New Zealand, partly as a migrant. In New Zealand, it is also known as the kumara moth, and in the Māori language as hīhue.

<span class="mw-page-title-main">Nectarivore</span> Animal in which nectar is a main source of nutrition in their diet

In zoology, a nectarivore is an animal which derives its energy and nutrient requirements from a diet consisting mainly or exclusively of the sugar-rich nectar produced by flowering plants.

<span class="mw-page-title-main">Ornithophily</span> Pollination by birds

Ornithophily or bird pollination is the pollination of flowering plants by birds. This sometimes coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics, Southern Africa, and on some island chains. The association involves several distinctive plant adaptations forming a "pollination syndrome". The plants typically have colourful, often red, flowers with long tubular structures holding ample nectar and orientations of the stamen and stigma that ensure contact with the pollinator. Birds involved in ornithophily tend to be specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.

<span class="mw-page-title-main">Pollination syndrome</span> Flower traits that attract pollinators

Pollination syndromes are suites of flower traits that have evolved in response to natural selection imposed by different pollen vectors, which can be abiotic or biotic, such as birds, bees, flies, and so forth through a process called pollinator-mediated selection. These traits include flower shape, size, colour, odour, reward type and amount, nectar composition, timing of flowering, etc. For example, tubular red flowers with copious nectar often attract birds; foul smelling flowers attract carrion flies or beetles, etc.

<i>Hyles lineata</i> Species of moth

Hyles lineata, also known as the white-lined sphinx, is a moth of the family Sphingidae. They are sometimes known as the hummingbird moth because of their bird-like size and flight patterns.

<i>Proserpinus</i> Genus of moths

Proserpinus is a genus of moths in the family Sphingidae, the sphinx moths or hawk moths. Species of the genus are native to North America with the exception of P. proserpinus, which has a much larger range extending from Asia to Africa. The genus was erected by Jacob Hübner in 1819.

<i>Macroglossum belis</i> Species of moth

Macroglossum belis, the common hummingbird hawkmoth, is a moth of the family Sphingidae. It was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is known from Sri Lanka, India, Nepal, Thailand, southern China, Taiwan, Japan, Vietnam and Indonesia (Java).

<i>Macroglossum bombylans</i> Species of moth

Macroglossum bombylans, the humble hummingbird hawkmoth, is a moth of the family Sphingidae. It is known from Nepal through China to Taiwan, Korea and Japan, with one record from the Russian Far East. It is also found in northern Thailand, northern Vietnam and the Philippines.

<i>Macroglossum glaucoptera</i> Species of moth

Macroglossum glaucoptera, the dark hummingbird hawkmoth, is a moth of the family Sphingidae. It was described by Arthur Gardiner Butler in 1875. It is known from Sri Lanka, Thailand, southern China, Vietnam, Malaysia (Peninsular), Indonesia and the Philippines (Mindanao). Single specimen recorded from Papua New Guinea.

<i>Macroglossum insipida</i> Species of moth

Macroglossum insipida, the hermit hummingbird hawkmoth, is a moth of the family Sphingidae. It was described by Arthur Gardiner Butler in 1875.

<i>Amphimoea</i> Genus of moths

Amphimoea is a monotypic moth genus in the family Sphingidae erected by Walter Rothschild and Karl Jordan in 1903. Its only species, Amphimoea walkeri, the Darwin hawkmoth, described by Jean Baptiste Boisduval in 1875, is found from Mexico south to Argentina.

<i>Basiothia schenki</i> Species of moth

Basiothia schenki, the brown striped hawk, is a moth of the family Sphingidae. The species was first described by Heinrich Benno Möschler in 1872. It is known from Zimbabwe and South Africa.

References

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  3. Herrera, Carlos M. (1992-02-01). "Activity pattern and thermal biology of a day‐flying hawkmoth (Macroglossum stellatarum) under Mediterranean summer conditions". Ecological Entomology. 17 (1): 52–56. doi:10.1111/j.1365-2311.1992.tb01038.x. hdl: 10261/44693 . ISSN   1365-2311. S2CID   85320151.
  4. P. Waring and M. Townsend. 2003, and later editions Field Guide to the Moths of Britain and Ireland
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  8. 1 2 Faucheux, Michel J. (2013-03-01). "Sensillum types on the proboscis of the Lepidoptera: a review". Annales de la Société Entomologique de France. Nouvelle Série. 49 (1): 73–90. doi:10.1080/00379271.2013.767514. ISSN   0037-9271. S2CID   84400239.
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Further reading