Ichneutica omicron

Last updated

Ichneutica omicron
Graphania omicron male.jpg
Male
Graphania omicron female.jpg
Female
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Genus: Ichneutica
Species:
I. omicron
Binomial name
Ichneutica omicron
(Hudson, 1898) [1]
Synonyms [2]
  • Melanchra omicronHudson, 1898
  • Graphania omicron(Hudson, 1898)

Ichneutica omicron is a species of moth in the family Noctuidae. [1] It is endemic to New Zealand and found only in the middle and lower parts of the North Island. It is very similar in appearance to its sister species Ichneutica barbara. The life history of this species is unknown as are the host species of the larvae. The adults are on the wing in November and December. This species is classified as "At Risk, Naturally Uncommon" by the Department of Conservation.

Contents

Taxonomy

Karori, type locality of this species EasternKarori.jpg
Karori, type locality of this species

This species was described and illustrated by George Hudson in 1898 and named Melanchra omicron. [3] It was discovered by Albert Norris in Karori, Wellington. [3] The type specimen is missing and has not been found at Museum of New Zealand Te Papa Tongarewa. [4] [5] The neotype can be found in the New Zealand Arthropod Collection. [2] In 1928 Hudson, thinking M. omicron was the same species as Aletia inconstans , discussed it under the latter name in his book The Butterflies and Moths of New Zealand. [4] In 1939 Hudson reinstated M. omicron as a separate species. [6] In 1988 John S. Dugdale placed this species within the genus Graphania. [4] In 2019 Robert Hoare undertook a major review of New Zealand Noctuidae. [2] During this review the genus Ichneutica was greatly expanded and the genus Graphania was subsumed into that genus as a synonym. [2] As a result of this review, this species is now known as Ichneutica omicron. [2]

Description

Hudson described the species as follows:

The expansion of the wings is about 1+12 inches. The fore-wings are pale olive-green, mottled and striped with dull grey; there is a double transverse line near the base, another at about one-fourth, and another at about one-half, passing between the orbicular and the reniform; beyond this, there are two indistinct shaded lines, and a terminal series of black marks; the orbicular is large, almost circular, and sharply outlined in black; the claviform is small and indistinct, and the reniform ill-defined, obscurely outlined in black towards the base. The hind-wings are brownish-grey, darker towards the termen. [3]

This species is almost indistinguishable visually from its sister species I. barbara . [2] The only visual difference is in the males with I. barbara having a yellowish anal tuft where as the male of the I. omicron has a grey anal tuft. [2] However I. barbara is only known from the South Island and so confusion between the species is unlikely. [2]

Distribution

This species is endemic to New Zealand. [7] [8] This species is known from the North Island only and has been observed in the central and southern parts of the North Island. [2]

Biology and behaviour

The life history of this species is unknown as are the host species of its larvae. The adults of this species is on the wing in November and December. [2]

Host species and habitat

This species has been collected in shrubland habitats including Olearia shrubland. [2] Specimens have also been collected in dunes on the coast as well as inland volcanic dunes. [2]

Conservation status

This species has been classified as having the "At Risk, Naturally Uncommon" conservation status under the New Zealand Threat Classification System. [9]

Related Research Articles

<i>Ichneutica mutans</i> Species of moth

Ichneutica mutans, commonly known as the New Zealand cutworm or the grey-brown cutworm, is a moth of the family Noctuidae. This moth endemic to New Zealand and can be found throughout New Zealand, including from Three Kings Islands down to Stewart Island. However this species is not found in the Chatham Islands. The adult moths are on the wing all year round. I. mutans is variable in appearance and can be confused with similar species in the same genus. As a result of the variety of host species consumed by the larvae of the species, including such crops as turnips, wheat and apples, this species is regarded as an agricultural pest. However between the early 1960s and late 1980s the population of I. mutans was shown to have decreased significantly, by over 80%, at two study sites.

<i>Ichneutica lignana</i> Species of moth

Ichneutica lignana is a moth of the family Noctuidae. It is endemic to New Zealand. This species is found on the Three Kings Islands as well as the North, South and Stewart Islands. This species lives in a variety of habitats including coastal areas, tussock grasslands, shrublands, and native forest, at a range of altitudes from sea level to over 1300 m. I. lignana is quite distinctive in appearance with its dark markings on the abdomen and forewings although it is possible to confuse Ichneutica morosa, Meterana pansicolor and Meterana pascoi with this species. Adults are on the wing throughout the year in the northern parts of the New Zealand but are restricted to the months of October to April in the more southern parts of the country.

<i>Ichneutica maya</i> Species of moth

Ichneutica maya is a moth of the family Noctuidae. It is endemic to New Zealand. It is found in the mountains in southern half of the North Island and in the South Island. I. maya is a distinctively coloured and patterned moth and as such is unlikely to be confused with similar species. I. maya can be found in the southern half of the North Island down through the South Island. This species can be found in alpine to subalpine zones with high rainfall but in Southland this species can be found down to sea level. This life history in the wild is unknown, nor has its larval host species been confirmed. Adults are on the wing from December to March and are attracted to sugar and light traps.

<i>Ichneutica lithias</i> Species of moth

Ichneutica lithias is a moth of the family Noctuidae. This species is endemic to New Zealand. It is a small moth but distinctive as a result of the markings on its forewings. Although this species is widespread in the South Island, it has only been collected in the Rangipo Desert in the North Island. The species prefers habitat that is scrubland ranging in altitude from coastal to alpine. Adults are on the wing from October to April and larvae have been collected and reared on the New Zealand endemic plant species Melicytus alpinus.

<i>Ichneutica nullifera</i> Species of moth

Ichneutica nullifera is a moth of the family Noctuidae. This species is endemic to New Zealand and can be found in the Tongariro National Park, along the Wellington coast and throughout the South Island. The adults are large and the forewing of adults can vary in colour from pale fawn to dark grey. The larvae are coloured a bright yellow-brown with a paler underside. The larval host species are in the genus Aciphylla and as a result the adult moths are often found in habitat dominated by species in this genus. Adults are on the wing from November to early April and are sometimes attracted to light.

<i>Ichneutica olivea</i> Species of moth

Ichneutica olivea is a moth of the family Noctuidae. It is endemic to New Zealand and is found in the central North Island down to the central South Island. It is very similar in appearance to I. lindsayorum but has a shorter basal streak and has white scaling from the subterminal line on the forewings that I. lindsayorum lacks This species prefers shrubland habitat. The life history of I. olivea is unknown as are the host species of its larvae. The adults are on the wing from December to March and are attracted to light.

<i>Ichneutica omoplaca</i> Species of moth

Ichneutica omoplaca is a moth of the family Noctuidae. It is endemic to New Zealand. It is widespread from the Bay of Plenty in the North Island down to Southland in the South Island. Specimens have also been collected from the Auckland Islands. It lives in a variety of habitats including beech forest clearings and tussock grasslands. This species has been recorded that some of the larval hosts of this species include Poa cita, Dactylis glomerata and it has been reared on Plantago lanceolata. The larva is undescribed but pupae have been found in a pine plantation in soil under weeds. Adults of this species are on the wing from October to March. The adult moths are variable in appearance but the diagnostic feature is the pale ochreous to white colouring between the basal streak and the costa which contrasts with the ground colour of the forewing.

<i>Ichneutica petrograpta</i> Species of moth

Ichneutica petrograpta is a moth of the family Noctuidae. This species is endemic to New Zealand where it is found in the southwest districts of the South Island, including Westland, Otago Lakes and Fiordland. It is very similar in appearance to I. mutans. It inhabits tussock and shrubland in the alpine to subalpine zones. Adults of I. petrograpta are on the wing from December to February and are attracted to sugar traps. The life history of this species is unknown as are the host species of its larvae.

<i>Physetica phricias</i> Species of moth endemic to New Zealand

Physetica phricias is a moth of the family Noctuidae. It is endemic to New Zealand. It is wide spread in the South Island and inhabits shrubland. The host of the larvae of this species is matagouri. The adult moths are on the wing from September to May and July, and are attracted both to light and sugar traps.They are a faster-flying species and remain active even during windy conditions. P. phricias can be confused with some forms of P. sequens. However P. phricias can be distinguished as it has a less marbled appearance to its forewing.

<i>Ichneutica oliveri</i> Species of moth

Ichneutica oliveri is a moth of the family Noctuidae. It is endemic to New Zealand, found only in the South Island. However it has not been observed on the eastern side of that island from mid-Canterbury southwards to Southland. This species is distinctive and is unlikely to be confused with other closely related species. It inhabits tussock grasslands, shrubland as well as granite sand plains, all in the alpine zone. Adults are on the wing from December to March and are attracted to light. They have been observed feeding on the flowers of Hebe species. The life history of this species is unknown as are the larval hosts.

<i>Ichneutica scutata</i> Species of moth

Ichneutica scutata is a moth of the family Noctuidae. It is endemic to New Zealand. This species can be found in the southern parts of the North Island as well as the eastern parts of the South Island. It is similar in appearance to I. insignis and I. skelloni but can be distinguished as I. scutata is much paler in appearance. It is likely this species inhabits lowland tussock grasslands as well as coastal dunes although it is not common in inland tussock grasslands. The larvae feed on a variety of herbaceous plants such as Plantago and Convolvulus species, Plagianthus divaricatus. It pupates on soil near its host plants. The adults are on the wing from late March to July.

<i>Ichneutica sericata</i> Species of moth

Ichneutica sericata is a moth of the family Noctuidae. It is endemic to New Zealand. This species is variable and difficult to distinguish from I. skelloni specimens. It is known from the southern part of the South Island and from Stewart Island. There has been one specimen collected in Taranaki but although Robert Hoare determined the species, he expressed reservations given the location of collection. I. sercata inhabits shrubland at altitudes of between 470 and 900m. The life history of this species is unknown as are the host species of its larvae. The adults of this species are on the wing in August at Stewart Island and in November and December in the South Island.

<i>Ichneutica averilla</i> Species of moth

Ichneutica averilla is a moth of the family Noctuidae. It is endemic to New Zealand. This species is found in the North Island at Mount Taranaki but is widespread throughout the South Island and Stewart Island. It prefers mountainous habitat but can be found down to sea level in the southern parts of the South Island. Adults of the species are on the wing between November and March. Larvae likely exist on a variety of herbaceous plants but have been recorded as feeding on species within the genus Plantago. This species is sometimes confused with I. mutas but can be distinguished from the latter on the basis of forewing colour as well as the absence of or an indistinct antemedian forewing line.

<i>Ichneutica cuneata</i> Species of moth

Ichneutica cuneata is a moth in the family Noctuidae. It is endemic to New Zealand. I. cuneata is found in and around the Tongariro National Park in the North Island and throughout the South Island. Specimens found in Tongariro National Park tend to be darker in appearance than South Island specimens but as their colour is variable, and antennae and genitalia of both species are consistent, they are not now regarded as a separate species. I. cuneata inhabits tussock grasslands and shrublands in alpine and subalpine zones. The adults are on the wing from December to April and can be found flying during the day. The life history of I. cuneata is unknown as are the specific host species of its larvae. However larvae of I. cuneata are said to feed on herbaceous plants. The adults of this species also pollinate native species such as Myosotis macrantha.

<i>Ichneutica panda</i> Species of moth

Ichneutica panda is a species of moth in the family Noctuidae. It is endemic to New Zealand and only found in central and southern parts of the South Island. The species has not been collected in Canterbury since the late 1950s and has not been seen at The Wilderness scientific reserve since 1941. This species is similar in appearance to Ichneutica falsidica however I. panda lack or have indistinct black dashes on their edge of their hindwings. I. panda inhabit shrubland from alpine zones down to river terraces and adults are on the wing between December and February. The life history of this species is unknown as is the host species of the larvae.

<i>Ichneutica dione</i> Species of moth endemic to New Zealand

Ichneutica dione is a moth of the family Noctuidae. It is endemic to New Zealand. This moth species is closely related to I. ceraunias and is very similar in appearance to that species. However I. dione has a much more restrictive range, being found only in the alpine zone and hills of the South Island and is less commonly collected. Adults of the species are on the wing from December to February and although sometimes can be found flying during the day, they are more commonly seen at night.

<i>Ichneutica nobilia</i> Species of moth

Ichneutica nobilia is a moth of the family Noctuidae. This species is endemic to New Zealand and can be found in the South Island, although not in the Nelson, Dunedin or Southland regions. This species prefers rocky habitats in alpine zones and the blueish-grey sheen on the species' forewings help camouflage it. Adults of I. nobilia are on the wing from December to February and are attracted to light. The life history of this species is unknown as are the host species of its larvae.

<i>Ichneutica chlorodonta</i> Species of moth endemic to New Zealand

Ichneutica chlorodonta, also known as the Green-toothed Owlet, is a moth of the family Noctuidae. This species is endemic to New Zealand. It is found throughout the North, South and Stewart Islands and is associated with native forest and shrubland. It can be confused with similar looking species such as I. subcyprea however I. chlorodonta can be distinguished through differences in colouration of its fore and hind wings as well as the length of the male pectinations. The life history of this species is unknown as are the host species of its larvae but adults of I. chlorodonta are on the wing from September to April.

<i>Ichneutica skelloni</i> Species of moth endemic to New Zealand

Ichneutica skelloni is a moth of the family Noctuidae. This species is endemic to New Zealand. Its presence has been confirmed in the North Island only in the Wellington region but is widespread throughout the South Island. It is also found in Stewart Island. I. skelloni is extremely variable in size, in the colour and patterns on the fore and hind wings, length of pectinations on male antennae and even in its genitalia. A larger more patterned form can be found in Westland and Fiordland, a medium-sized form is found from Wellington to Stewart Island and there is also a smaller Dunedin and Southland form. This species can be confused with specimens with the species I. insignis, I. scutata and I. pelanodes. I. skelloni can be found in forest and shrubland habitat. Adults are on the wing from July to April and are attracted to light. Host plants for the larvae are found in the genera Plantago, Senecio and Ranunculus and also include the species Bellis perennis.

<i>Physetica sequens</i> Species of moth endemic to New Zealand

Physetica sequens is a species of moth of the family Noctuidae. It is endemic to New Zealand and can be found throughout the North and South Islands. It appears to be more common in the North Island than the South Island, and lives in open native shrublands, peatlands, Northland gumland, inland volcanic dunes, and Dracophyllum-dominated areas at altitudes that range from sea level to the alpine zone, up to at least 1600 m. Larvae of this species have been successfully reared on Leucopogon fasciculatus and Leptecophylla juniperina. The adults of this species are variable in appearance and are on the wing from September to March. P. sequens is similar in appearance to P. phricias but can be distinguished as P. phricias has a narrow black line along the dorsum of its forewing that P. sequens does not. P. sequens is also similar in appearance to P. cucullina however the forewing dorsum area of P. sequens does not have the narrow black line that is frequently present on P. cucullina forewings.

References

  1. 1 2 "Ichneutica omicron (Hudson, 1898)". www.nzor.org.nz. 2021. Retrieved 2021-07-29.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Hoare, Robert J. B. (9 December 2019). "Noctuinae (Insecta: Lepidoptera: Noctuidae) part 2: Nivetica, Ichneutica". Fauna of New Zealand. 80: 1–455. doi:10.7931/J2/FNZ.80.
  3. 1 2 3 Hudson, George Vernon (1898). New Zealand moths and butterflies (Macro-lepidoptera). London: West, Newman & co. p. 22. doi:10.5962/bhl.title.7912.
  4. 1 2 3 Dugdale, J. S. (1988). "Lepidoptera - annotated catalogue, and keys to family-group taxa" (PDF). Fauna of New Zealand. 14: 77. Archived from the original (PDF) on 27 January 2019. Retrieved 22 May 2018.
  5. Patrick, Brian; Dugdale, John S. (2000). Conservation status of the New Zealand lepidoptera (PDF). Wellington, N.Z.: Department of Conservation, New Zealand. p. 24. ISBN   0478218672. OCLC   154670803.
  6. Hudson, G. V. (1939). A supplement to the butterflies and moths of New Zealand. Wellington: Ferguson & Osborn Ltd. p. 400.
  7. "Ichneutica omicron (Hudson, 1898)". nztcs.org.nz. 2021. Retrieved 2021-07-29.
  8. Gordon, Dennis P., ed. (2010). New Zealand inventory of biodiversity: Kingdom animalia : chaetognatha, ecdysozoa, ichnofossils. Vol. 2. p. 460. ISBN   978-1-877257-93-3. OCLC   973607714. OL   25288394M. Wikidata   Q45922947.
  9. Hoare, R.J.B.; Dugdale, J.S.; Edwards, E.D.; Gibbs, G.W.; Patrick, B.H.; Hitchmough, R.A.; Rolfe, J.R. (2017). "Conservation status of New Zealand butterflies and moths (Lepidoptera), 2015" (PDF). New Zealand Threat Classification Series. 20: 8.