Nyctemera annulata

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Nyctemera annulata
Nyctemera annulata (Weir).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Erebidae
Subfamily: Arctiinae
Genus: Nyctemera
Species:
N. annulata
Binomial name
Nyctemera annulata
Boisduval, 1832
Synonyms
  • Leptosoma annulatumBoisduval, 1832
  • Nyctemera annulatum(Boisduval, 1832)
  • Nyctemera doubledayiWalker, 1854
  • Nyctemera tripunctariaSwinhoe, 1916

Nyctemera annulata, the magpie moth, is a moth of the family Erebidae. The species was first described by Jean Baptiste Boisduval in 1832. It is endemic to New Zealand and found in all parts of the country.

Contents

Description

The magpie moth's "woolly bear" caterpillars are around 35–38 mm when fully grown and predominantly black with lines of red down its sides and back, [1] [2] blue spots and tufts of hair on each segment. [1] [2] Its liking for the introduced ragwort causes its caterpillars to be sometimes misidentified as those of the cinnabar moth which was introduced as a biological control for ragwort. By contrast cinnabar caterpillars have smooth bodies with alternating yellow and black rings. [3]

The adult moth has black wings with white markings on both the forewings and hindwings. The forewings have two white spots that are more elongated while the hindwing only has a single spot near to the centre; [2] [4] the wingspan is 35–45 mm. [2] [5] [6] The thorax and abdomen of the moth are black with bands of orange. [1] The magpie moth is diurnal which, coupled with its colourful markings means it is often mistaken for a butterfly. [2] [4] [7] It is most active from September to June in the mornings and evenings where it can be seen flying over the tops of host plants. [1] [4] [5]

Nyctemera annulata is closely related to Nyctemera amica , an Australian species which also occurs in New Zealand. The two species may be able to interbreed.

Subspecies

Distribution

Natural global range

Nyctemera annulata is only found in New Zealand. [9] [10] [11]

New Zealand range

Nyctemera annulata is found all over New Zealand, both in the North and South Islands as well as on smaller outlying islands. [10] The N. annulata caterpillar have the ability to freeze themselves and survive. [12] This tolerance of cold weather and freezing temperatures has ensured they are able to exist throughout New Zealand.

Habitat preferences

Nyctemera annulata are only present in habitats where Senecio species occur. They are found most commonly in natural habitats but were also found to occur modified and urban habitats as long as Senecio host plants were present, either naturalized or native. [13]

Life cycle/phenology

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Mating
Eggs and early instar Moth eggs on ragwort 01.jpg
Eggs and early instar

The life cycle of Nyctemera annulata takes 6–7 weeks to complete and requires warm weather with the winter being passed in the pupa stage. [5] The moth will lay yellow eggs on the undersides of herbaceous Senecio species. [1] [5] [14] The eggs gradually become dark and will hatch after approximately 6 – 7 days. [1] [15] Larvae in the first to third developmental stages (instars) feed on the surface of the underside of the leaves of the host plants and use silken threads to move to new fresh food sources or to get back to the plant should they fall off. [4] Fourth and fifth instars feed in exposed positions on the top surface of the leaf and have well developed setae compared to the earlier instars. [1] [4] The larvae will feed primarily on species from the genus Senecio [2] [4] and are able to migrate considerable distances to new food sources when necessary. [14] When the caterpillar is fully grown it will be approximately 36mm long [1] [2] and at this stage it begins to look for a crevice in which to spin its cocoon ready for pupation to take place. [1] [2] [4] Hairs from the caterpillar are incorporated into its silken cocoon. [5] The cocoon becomes black and shiny with yellow markings and the pupa will stay like this for 12 – 35 days. [4] The length of pupation is largely affected by temperature and the humidity also has an effect on the pupal survival. The complete cycle of Nyctemera annulata takes 6 – 7 weeks depending on the temperature and therefore the time of year. [14]

Diet and foraging

The primary food source of Nyctemera annulata are plants from the tribe Senecioinae of the Asteraceae. [15] Thirty three species are known to exist in the wild and New Zealand has 19 native Senecio species with 14 of them naturalised exotics. [16] N. annulata diet is specifically limited to one specific plant. Even though the magpie moth is a native, it has been found that they do not restrict themselves to only the native Senecio species in New Zealand and will also feed on exotic introduced species. [16]

N. annulata is a monophagous herbivore insect meaning that their diet is limited to a species of plant. A study found that N. annulata did not restrict itself to the native Senecio although the insects were found more frequently in the native forested areas than in the urban/rural area [16] These findings are based on research in the Auckland area, and the study found that the numbers of Nyctemera would be far fewer if there were not the naturalised exotic species available to them.

The most common form of Senecio found in New Zealand is the introduced 'ragwort' ( Jacobaea vulgaris ) - a weed in most cultivated areas of the country and the magpie moth can often be seen around cultivated farmlands during the summer months and feed primarily on the leaves and flowers. [17] Other favoured plants include Senecio vulgaris (groundsel) and garden cineraria. [18]

Predators, parasites, and diseases

Viruses, Subgroup B: Granulosis and Cytoplasmic polyhedrosis and two unidentified viruses can be found in Nyctemera annulata and these are all naturally occurring. [19]

In addition, a predator known to attack N. annulata is a parasitic wasp. Echthromorpha intricatoria will attack by laying its egg into the pupae of the moth. The larvae of the wasp will then hatch and use the host as food to develop. [1] It is believed that the patterning of the caterpillar acts as a warning to birds and as a result birds are not a threat to them. [1]

Due to its bright colour and bitter taste N. annulata is left alone by most bird predators. The shining cuckoo is one exception and will prey on the spiny caterpillar. The cuckoos tend to leave the skin, only eating the viscera of the caterpillar. If the skins are swallowed they are later disposed of in pellets covered with saliva. [4] One third of the caterpillars found in the stomach of shining cuckoos in a study were N. annulata. [20]

Cultural uses

Mokarakara is thought to be the name Māori used for N. annulata, their description being that it was a day-flying moth that was black with white spots (Miller, 1952).

Lessiter (1989) recorded that Māori knew butterflies as pūrerehua and that they referred to the pupa as tūngoungou (meaning "to nod"). This was describing the pupa's abdomen as it bends back and forth and the pupae were sometimes used in a child's game. Grandparents would ask their grandchildren to hold the pupa between their thumb and forefinger and ask questions of it. An example would be "Am I a good girl?". The answer would depend on which way the pupa wriggled – up to indicate "yes" and down was for "no".

There has been some research into the role of plant metabolites, particularly pyrrolizidine alkaloids that are sequestered by N. annulata. The alkaloids are produced by the plant as a defence against herbivory and the larvae of the moth take them up, potentially also as a form of defense suggested by the high levels of toxin found in the moth. [21] This may be another reason there is not much predation of either the larvae or moth.

Related Research Articles

<i>Jacobaea vulgaris</i> Flowering plant, daisy family Asteraceae

Jacobaea vulgaris, syn. Senecio jacobaea, is a very common wild flower in the family Asteraceae that is native to northern Eurasia, usually in dry, open places, and has also been widely distributed as a weed elsewhere.

<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>Pieris rapae</i> Species of butterfly

Pieris rapae is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae. It is known in Europe as the small white, in North America as the cabbage white or cabbage butterfly, on several continents as the small cabbage white, and in New Zealand as the white butterfly. The butterfly is recognizable by its white color with small black dots on its wings, and it can be distinguished from P. brassicae by its larger size and the black band at the tip of its forewings.

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

The cinnabar moth is a brightly coloured arctiid moth found as a native species in Europe and western and central Asia then east across the Palearctic to Siberia to China. It has been introduced into New Zealand, Australia and North America to control ragwort, on which its larvae feed. The moth is named after the red mineral cinnabar because of the red patches on its predominantly black wings. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. Cinnabar moths are about 20 mm (0.79 in) long and have a wingspan of 32–42 mm (1.3–1.7 in).

<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>Nyctemera</i> Genus of moths

Nyctemera is a genus of tiger moths in the family Erebidae first described by Jacob Hübner in 1820. The genus includes the species Nyctemera annulata and Nyctemera amica, which are closely related and are able to interbreed.

<i>Hyalophora cecropia</i> Species of moth

Hyalophora cecropia, the cecropia moth, is North America's largest native moth. It is a member of the family Saturniidae, or giant silk moths. Females have been documented with a wingspan of five to seven inches or more. These moths can be found all across North America as far west as Washington and north into the majority of Canadian provinces. Cecropia moth larvae are most commonly found on maple trees, but they have also been found on cherry and birch trees among many others. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.

<span class="mw-page-title-main">Saddleback caterpillar</span> Larva of an eastern North American moth

The saddleback caterpillar is the larva of a species of moth native to eastern North America. It is also found in Mexico. The species belongs to the family of slug caterpillars, Limacodidae.

<i>Acronicta rumicis</i> Species of moth

Acronicta rumicis, the knot grass moth, is a species of moth which is part of the genus Acronicta and family Noctuidae. It was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is found in the Palearctic region. A. rumicis lives and feeds on plants located in wide-open areas. At its larval stage, as a caterpillar, it causes such a large impact as a crop pest that it has received much attention and research. A. rumicis feeds on maize, strawberries and other herbaceous plants.

<i>Eriogaster lanestris</i> Species of moth

Eriogaster lanestris, commonly known as the small eggar, is a moth of the family Lasiocampidae that is found across the Palearctic. Unlike many other members of the Lasiocampidae, the small eggar is a social insect. Historically, only eusocial insects like ants, bees, and termites were thought to exhibit complex social organization and communication systems. However, research since the late 20th century has found that E. lanestris, among a number of other phylogenetically related moth and butterfly species, demonstrates social behaviors as well. Larvae spend nearly their entire development in colonies of about 200 individuals, and this grouped social structure offers a number of benefits, from thermoregulation to increased foraging success.

<i>Nyctemera amicus</i> Species of moth

Nyctemera amicus, the senecio moth, magpie moth or cineraria moth, is a moth of the family Erebidae. The species was first described by Adam White in 1841. It is found in South-east Asia, Oceania, and most of Australia. It can also be found in New Zealand.

<i>Hellula undalis</i> Species of moth

Hellula undalis, the cabbage webworm or Old World webworm, is a moth of the family Crambidae. It is a widespread species which is found from Europe across Asia to the Pacific. It was first described from Italy.

<i>Samea multiplicalis</i> Species of moth

Samea multiplicalis, the salvinia stem-borer moth, is an aquatic moth commonly found in freshwater habitats from the southern United States to Argentina, as well as in Australia where it was introduced in 1981. Salvinia stem-borer moths lay their eggs on water plants like Azolla caroliniana, Pistia stratiotes, and Salvinia rotundifolia. Larval feeding on host plants causes plant death, which makes S. multiplicalis a good candidate for biological control of weedy water plants like Salvinia molesta, an invasive water fern in Australia. However, high rates of parasitism in the moth compromise its ability to effectively control water weeds. S. multiplicalis larvae are a pale yellow to green color, and adults develop tan coloration with darker patterning. The lifespan, from egg to the end of adulthood is typically three to four weeks. The species was first described by Achille Guenée in 1854.

<i>Nyctemera luctuosa</i> Species of moth

Nyctemera luctuosa is a moth of the family Erebidae first described by Samuel Constantinus Snellen van Vollenhoven in 1863. It is found in Papua New Guinea, Australia and the Philippines. The habitat consists of mountainous areas.

<i>Cleora scriptaria</i> Species of moth

Cleora scriptaria, the kawakawa looper moth, is a moth in the family Geometridae endemic to New Zealand.

<i>Niphanda fusca</i> Species of butterfly

Niphanda fusca is a parasitic butterfly primarily found in East Asian countries such as Japan and Korea. It is a "cuckoo-type" parasite of the ant Camponotus japonicus. It utilizes chemical mimicry to trick the host worker ants into adopting it while it is a third-instar caterpillar. From there, it is fed mouth-to-mouth by the worker ants as though it were one of their own young.

<i>Declana egregia</i> Species of moth

Declana egregia, commonly called the South Island lichen moth or zebra lichen moth, is a moth in the family Geometridae, endemic to New Zealand. This species was first described by entomologists Baron Cajetan von Felder and Alois Friedrich Rogenhofer in 1875 under the name Chlenias egregia.

<i>Senecio quadridentatus</i> Species of flowering plant

Senecio quadridentatus is native to Australia and New Zealand. In New Zealand it is known by its Māori name pahokoraka or pekapeka. Senecio quadridentatus is an annual or perennial herbaceous flowering plant in the family Asteraceae. It is also known as Erechtites quadridentata Labill by the synonyms.

<i>Senecio minimus</i> Species of plant

Senecio minimus, commonly known as toothed fireweed and coastal burnweed, is a species of plant in the sunflower family. It is native to Australia and New Zealand, and also naturalized on the Pacific Coast of the United States.

References

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