Moth Of The Week

Moth of the Week

Madagascan Sunset Moth

Chrysiridia rhipheus (misspelled “ripheus”)

The Madagascan sunset moth is in the family Uraniidae. This species was first described in 1773 by Dru Drury who put it in the Papilio genus, a genus of butterflies. He though this because it looked like a swallowtail butterfly, and additionally the specimen he was given had a different species’s head with clubbed antennae (a defining characteristic of butterflies) attached to the body. Jacob Hübner corrected this mistake in 1823 and placed the moth in the genus Chrysiridia. I though this moth would be perfect to post in June for its rainbow colors.

Description The Madagascan sunset moth’s body is covered in black fur on the back and orange fur on the underside. The thorax is an iridescent blue or green and the legs and head are black with filiform antennae. The wings are iridescent red, blue, and green with the colors mixing for the full rainbow. Black patterning of spots and stripes are on all four wings with the forewings having a black edge. The hindwings themselves have a white fringe on the edge and six tails which are often broken off or damaged over time. The upper side of both wings are mostly black with a large patch by the body. Patterns on the wings can vary and some moths are asymmetrical. This can be caused by many things like temperature shock during growth.

The colors on this moth’s wings do not come from pigments, but instead are caused by the scattering of light from the wings’ scales.

Average wingspan in high altitudes: 7 cm (≈2.8 in)

Average wingspan in low altitudes: 9 cm (≈3.5 in)

On occasion a moth’s wingspan can be as large as 11 cm (≈4.3 in).

Diet and Habitat The larva feed on four types of plants from the Omphalea genus that grow only on Madagascar. These species are O. ankaranensis, O. palmata, O. occidentalis, and O. oppositifolia. The larva eat all parts of the plants from leaves, to stems, to flowers, to fruits, but they avoid the veins of the leave which have a toxic latex in them. Adult moths drink nectar and prefer white or whitish-yellow flowers especially from the Indian almond tree, tea plant, loquat, plants in the Eucalyptus genus, and common mango tree.

First believed to have come from China or Bengal, this moth is only found in Madagascar. They migrate over the island to different areas with their host plant and can be found all over the island except for the south west and extreme south where their host does not grow. This moth’s preferred habitats are deciduous forests and rain forest regions.

Mating These moths mate all year but have the highest populations in March to August and the lowest populations in October to December. The females lay their eggs late in the afternoon or at nightfall. The females will usually lay the eggs in the underside of the host plant’s leaves in groups but can on occasion lay them on top.

Average number of eggs laid in each group: 80 eggs

Predators The Omphalea genus the caterpillars feed on also attracts polistine wasps who prey on the larva. However, the caterpillars and adult moths are toxic because the Omphalea species contains polyhydroxy alkaloids, which the caterpillars gain by eating and retain as adult moths. The wings’ bring colors are a warning signal of this.

Fun Fact The Malagasy people believe the souls of the dead or of ancestors appears in the form of a lepidopteran. The Madagascan sunset moth is specifically called adriandolo or lolonandriana, from lolo for "spirit" or "butterfly" and andriana for "noble" or "king.”

Additionally, eating the silk from this moth is said to cause a euphoric high.

Another interesting fact is the Madagascan sunset moth is one of only two species in the Chrysiridia genus.

(Source: Wikipedia, Moth Identification, Bug Under Glass)

Moth of the Week

Domestic Silk Moth

Bombyx mori

The domestic silk moth is from the family Bombycidae. It is very closely related to the wild silk moth (Bombyx mandarina), which was first described in 1872 by Frederic Moore. The domestic silk moth was created through selective breeding in order to produce more silk and therefore lacks several behaviors of other moths.

Description This species has white hairy bodies, legs, and wings unlike the wild silk moth which is pigmented brown. This loss of color is due to the domesticated moths no longer needing camouflage. Additionally, this species wings form from larval imaginal disks, and although some may be able to hover, due to domestication the B. mori in incapable of prolonged flight as their bodies are too big to carry. This changes their mating behaviors.

Compared to the wild silk moth, the domesticated silk moth has increased cocoon size, body size, growth rate, and quicker digestion.

Wingspan Range: 3 – 5 cm (1.2 – 2.0 in)

Females are about 2 to 3 times the size of males to carry the eggs.

Diet and Habitat Silk moth larva or silkworms prefer to eat white mulberry leaves and other species of mulberries. They are also known to eat the leaves of the osage orange.

As domesticated species, these moths live in man made habitats for silk production.

It’s undomesticated relative the wild silk moth, B. mandarina, ranges from inland China to Korea and Japan.

Mating Since they cannot fly to find mates like the males of other silk moths species, the B. mori is completely dependent on humans for mating.

The eggs laid are put in and hatch in incubators after approximately 14 days.

Predators This species has no predators due to being taken care of by humans. They have also lost their camouflage, seen in the B. mandarina, from domestication.

Fun Fact Many Asian cultures such as Indian, Chinese, Korean, Vietnamese, and Thai eat silkworms. They are roasted, boiled, and/or packaged for snack sale. They have also been proposed as food for astronauts on long missions.

(Source: Wikipedia)

Moth of the Week

Beautiful Yellow Underwing

Anarta myrtilli

The beautiful yellow underwing is a moth in the family Noctuidae. This species was first described in 1761 by Carl Linnaeus. They are predictably named for the yellow portion of the hindwings.

Description This moth has many color variations depending on region.

The most common coloration is a red and olive brown or olive yellow forewing with strong white patterning. Additionally, the forewings have a ringed stigmata (a spot by the middle of the forewing found on Nocuids) next to a distinctive white spot. The hindwings are orange-yellow with a dark brown borders.

In Sweden, northern England, and northern Scotland the forewings are instead a dull dark purple with paler patterning, the same triangular white spot, and a less visible stigmata. The hindwings are the same yellow-orange but with black borders.

Other minor differences are the forewing being mixed with olive brown in East Anglian, the red in the forewing being almost entirely switched with black in Hyères, France, and the forewing being mixed with black as well as a pale yellow hindwing in Sintra, Portugal.

Average wingspan: 21 mm (≈0.83 in)

Diet and Habitat This moth feeds on Heather and Bell Heather only. It can be found across Europe in Scandinavia, Britain, France, Germany, Switzerland, Spain, Portugal, Italy, and Russia. They prefer sunny habitats that grow heather easily such as heathland and moorland in the mountain and sandy areas.

Mating The beautiful yellow underwing usually has two generations per year from April to early September. The larvae hatch from their eggs, which are laid on heather, in July in the north and April in the south.

Predators This moth is parasitized by the flies Athrycia impressa, Campylocheta inepta, and Phryxe vulgaris while both are in their larval stages.

Fun Fact The beautiful yellow underwing flies mainly during the day but occasionally comes out at night.

(Source: Wikipedia, Butterfly Conservation, Pyrgus.de, BioInfo (UK))

Moth of the Week:

Rosy Maple Moth

Dryocampa rubicunda

First described by Johan Christian Fabricius in 1793, this moth is part of the Saturniidae family. This family is better known as the great silk moth family. However, these moths are the smallest of the silk moths. They get their name from their preferred host plants: maple trees.

Description One difference between males and females are males have larger antennae to sense female mating pheromones. Both share pink antennas, undersides, and legs. Body and wing colors range from yellow, pink, white, and cream. As caterpillars they are green.

Female wingspan: 3.8 - 5 cm (1.5 - 2 in)

Male wingspan: 4.3 - 4.4 cm (1.25 - 1.75 in)

Diet and Habitat The rosy maple moth feeds on red maples, sugar maples, silver maples, box elder maples, and turkey oaks. The caterpillars eat the entire leaf and can even defoliate entire trees, however the damage isn’t usually permanent. Adult moths have no mouths so they do not eat. Rosy maple moths are found on the Atlantic coast of the United States and eastern Canada. Their northernmost reach includes Ontario, Quebec, New Brunswick, Nova Scotia, and Prince Edward Island. Their southernmost reach is Dade County, Florida. They extend west from eastern Texas to Minnesota. Caterpillars live in temperate forests by suburban and urban landscapes

Mating Adult moths are solitary besides mating. During the warmer months, females release pheromones at night to attract males then lay eggs 24 hours after mating. Usually females lay eggs once a season, but they can lay up to 3 times in souther regions. In these cases, rosy maple moths are polyandrous, meaning they will have multiple mating partners. Females lay eggs on the underside of the leaves of the host trees in groups of 10 to 40 eggs.

Average amount of eggs laid: 150 - 200

Predators The predators of these moths are birds like blue jays, tufted titmice, and black-capped chickadees. To prevent predation, this moth uses bright colors to trick predators into thinking it is poisonous. Additionally, the colors help the moth camouflage itself by blending in with the maple seed cases.

Fun Fact Rosy maple moths can’t hear sounds.

(Source: Wikipedia and Animal Spot)

Moth of the Week

Io Moth

Automeris io

The Io moth or peacock moth is in the family Saturniidae. The name Io comes from Greek mythology in which the mortal Io was turned into a cow by Hera for sleeping with Zeus. The eyespots are said to look like the eyes of a cow. The species was first described in 1776 by Johan Christian Fabricius.

Description Males have yellow to orangish yellow body, legs, and forewings with symmetrical brown patterned markings. On the hindwings are large black eyespots with a white center and surrounded by yellow, black, and red orange edges. Also on the hidwings are a large red orange edge on the edge closet to the body. Females have reddish-brown body, legs, and forewings with patterns in varying shades of brown. the hindwings are similar to those of the male but with maroon instead of red orange and a small light brown edge. Some hybridizations have resulted in variations in these hindwing eyespots.

Average wingspan: 75.5 mm (≈3 in)

Males have larger antennae

Females have larger bodies and wings

Diet and Habitat The io moth caterpillars first feed on the eggs they hatch from then their host plants. These host plants are a variety of grasses, herbaceous plants, shrubs, deciduous trees, and conifers. Some of these plants included the mulberry, pin cherry, willow, balsam fir, red maple, bastard indigo, wild indigo, American hornbeam, sugarberry or southern hackberry, button-bush, eastern redbud, showy partridge pea, sweetfern, flowering dogwood, and common hazel. Adults do not feed. This species’s preferred habitats are deciduous forests, thorn scrub, and suburban areas in continental North American. They range from Manitoba to Nova Scotia in Canada and from Montana to Texas and onward over all the eastern states in the United States.

Mating Io moths breed from late May to July, though southern populations may breed earlier and later in the season due to having several broods per seasons as opposed to the north’s single brood. The females emit pheromones to call males as soon as the second night after leaving the cocoon. Males detect female pheromones with their antennae and mating lasts for about 90 minutes staring around 9:45 to 10:30 pm. 3 to 5 days after mating, females lay their eggs in clusters of 20 to 35 on the host plants leave or stems. Eggs hatch after 8 to 11 days.

Average eggs laid: 300

Predators This species is harmed by many species of parasitic flies and wasps and hunted by birds, small mammals, and spiders. In defense, the caterpillars of the io moth have venomous spikes. This venom isn’t fatal to humans, but it does caus acute dermatitis. The adult io moths use their hindwing eyespots to scare off predators by shaking them to imitate a larger animal.

Fun Fact Adult moths are strictly nocturnal and rest on the branches or trucks of trees during the day.

(Source: Wikipedia, University of Florida, Missouri Department of Conservation, Butterflies and Moths of North America, Animal Diversity Web, Adopt and Shop, Kiddle)

Moth of the Week

Atlas Moth

Attacus atlas

This moth is a part of the Saturniidae family, or the family of great silk moths and royal moths. This moth was first described by Carl Linnaeusin 1758. The atlas moth is of of the largest species in the Lepidoptera order, the order of insects for butterflies and moths

Description An atlas moths has a small body and large wings.

Wingspan: 24 cm (9.4 in)

Wing surface area: 160 cm (≈25 in2)

The upper surface of the wings are maroon, black, white, pink, and purple with four triangular outlines in black. These outlines border a translucent part of the wings where there are no scales, the tips of the moth’s forewings resemble snakes to scare off predators.

Common traits of most Lepidoptera:

Females are larger than males

Males have larger antennae

Diet and Habitat Atlas moths are native to dry rainforests, secondary forests, and shrublands in Southern and Eastern Asia. Atlas moth caterpillars eat the leaves of citrus fruits, willows, cinnamon trees, guava trees, and Jamaican cherry trees. Adult moths do not have mouths and no not eat.

Mating For mating, a female moth will release pheromones which the male moths decent with their antennae. A female moth will lay 200 to 300 eggs on the underside of the leaves the caterpillars eat. It takes about 2 weeks for the eggs to hatch.

Predators The main predators do these moths are lizards and birds. The moth’s wings are patterned to look like snakes’ heads to scare off predators.

Fun Fact Atlas moths only live for 5 to 7 days because they live off of energy stored as a caterpillar.

(Source: Wikipedia, Animal Spot, and California Academy of Sciences)