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''Liothula omnivora'', the common bag moth, is a psychid
Like other bagworms, ''L. omnivora'' caterpillars construct and live within a small, mobile, tapering bag of silk, which provides camouflage and protection to the caterpillar. The bag is lengthened at the broad or mouth end as the caterpillar grows. The caterpillar secures itself within the bag using hooks on its anterior prolegs, allowing it to extend the head and thorax while dragging the bag behind it. When threatened, it quickly retreats into the bag and draws the mouth tightly closed. The caterpillar begins construction of its bag within a few days of hatching. Initially the bag is held erect, but as the caterpillar grows larger the bag trails behind and beneath the insect.
The exterior of the bag is often decorated with small leaf and bark fragments. The quantity and placement of these fragments indicates the sex of the caterpillar - females have few fragments and mostly placed towards the narrow end of the bag, whilst males attach many fragments along the length of the bag.
The caterpillar itself has a black or brown and white speckled head and thorax, with the remainder of the body being plain brown. Female caterpillars grow larger, with the average bag of pupal females measuring 45 mm compared to pupal male bags averaging 42 mm.
As the scientific name suggests, the caterpillars of ''L. omnivora'' feed on a very wide range of native and exotic broad-leaved and coniferous shrubs and trees, which they feed on at night. They feed on the foliage, but may occasionally constrict twigs so tightly that sap flow is restricted and gall-like swellings occur.
Only the male metamorphoses into a recognisable moth. The adult female never leaves the bag and has no wings, merely an abdomen and rudimentary head and thorax.
The male is a hairy, black moth with translucent wings and a tapered abdomen and a 28–38 mm wingspan.
Males usually emerge from the pupa in the early morning. When ready to emerge, the male pupa forces its way to the narrow exit of the bag and extends the front part of the body through the hole. Held in place by spines on the abdomen, the pupa then splits and the adult male emerges. He then clings to the bag while the wings expand and harden. When mating, the male inserts the telescopic end of his abdomen through the narrow end of the female's bag. She lays her eggs within the bag and dies. The caterpillars emerge through the narrow end of the female's bag and disperse via crawling, lowering themselves on silk threads or by wind.
moth
Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
. It is also known by several Māori
Māori or Maori can refer to:
Relating to the Māori people
* Māori people of New Zealand, or members of that group
* Māori language, the language of the Māori people of New Zealand
* Māori culture
* Cook Islanders, the Māori people of the C ...
vernacular names like the tūngou ngou,< ''whare atua'' ('house of the spirit') or ''kopi'' ('shut').
There are over 50 species of Psychidae and at least two species of ''Liothula'' in New Zealand.
Taxonomy
This species was described by Richard William Fereday in 1878. In 1928George Hudson
George Hudson (probably 10 March 1800 – 14 December 1871) was an English railway financier and politician who, because he controlled a significant part of the railway network in the 1840s, became known as "The Railway King"—a title conferr ...
placed this species within the ''Oeceticus'' genus and amended its epithet to ''omnivorous''. However this was not accepted by other taxonomists.
Caterpillar and bag
Like other bagworms, ''L. omnivora'' caterpillars construct and live within a small, mobile, tapering bag of silk, which provides camouflage and protection to the caterpillar. The bag is lengthened at the broad or mouth end as the caterpillar grows. The caterpillar secures itself within the bag using hooks on its anterior prolegs, allowing it to extend the head and thorax while dragging the bag behind it. When threatened, it quickly retreats into the bag and draws the mouth tightly closed. The caterpillar begins construction of its bag within a few days of hatching. Initially the bag is held erect, but as the caterpillar grows larger the bag trails behind and beneath the insect.
The exterior of the bag is often decorated with small leaf and bark fragments. The quantity and placement of these fragments indicates the sex of the caterpillar - females have few fragments and mostly placed towards the narrow end of the bag, whilst males attach many fragments along the length of the bag.
The caterpillar itself has a black or brown and white speckled head and thorax, with the remainder of the body being plain brown. Female caterpillars grow larger, with the average bag of pupal females measuring 45 mm compared to pupal male bags averaging 42 mm.
As the scientific name suggests, the caterpillars of ''L. omnivora'' feed on a very wide range of native and exotic broad-leaved and coniferous shrubs and trees, which they feed on at night. They feed on the foliage, but may occasionally constrict twigs so tightly that sap flow is restricted and gall-like swellings occur.
Pupa and adult
Pupation usually occurs during winter. When ready to pupate, ''L. omnivora'' permanently secures the bag to a twig using a wide band of silk or to larger surfaces by a mat of many short lengths of silk. They then close both ends and add an extra lining of silk to the interior, and then pupate within the bag.
Only the male metamorphoses into a recognisable moth. The adult female never leaves the bag and has no wings, merely an abdomen and rudimentary head and thorax. The male is a hairy, black moth with translucent wings and a tapered abdomen and a 28–38 mm wingspan.
Males usually emerge from the pupa in the early morning. When ready to emerge, the male pupa forces its way to the narrow exit of the bag and extends the front part of the body through the hole. Held in place by spines on the abdomen, the pupa then splits and the adult male emerges. He then clings to the bag while the wings expand and harden. When mating, the male inserts the telescopic end of his abdomen through the narrow end of the female's bag. She lays her eggs within the bag and dies. The caterpillars emerge through the narrow end of the female's bag and disperse via crawling, lowering themselves on silk threads or by wind.
Parasites
''L. omnivora'' caterpillars are commonly attacked bytachinid
The Tachinidae are a large and variable family of true flies within the insect order Diptera, with more than 8,200 known species and many more to be discovered. Over 1,300 species have been described in North America alone. Insects in this family ...
flies and also ichneumonid
The Ichneumonidae, also known as the ichneumon wasps, Darwin wasps, or ichneumonids, are a family (biology), family of parasitoid wasps of the insect order Hymenoptera. They are one of the most diverse groups within the Hymenoptera with roughly 2 ...
wasps.
Tachinids, primarily '' Pales feredayi'' and '' P. marginata'', lay their eggs on foliage which are then ingested by the bagworm caterpillar. The maggots then eat through the gut wall and feed on the caterpillar, leaving the host's body when it dies and pupating within the bag. Remains of the grubs and their brown puparia are often found inside cases, alongside the remains of the caterpillar. The tachinid larvae are in turn eaten by another parasitoid wasp, which bites small, round emergence holes in the side of the bag.
Parasitoid ichneumonid wasps known to attack ''L. omnivora'' include the white-spotted ichneumonid '' Ecthromorpha intricatoria'' (Fereday), '' Xanthopimpla rhopaloceros'' (Krieger) and ''Paraphylax'' species. ''E. intricatoria'' parasitises various Lepidopteran
Lepidoptera ( ) is an order of insects that includes butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 families and 46 superfamilies, 10 percent of the total described specie ...
pupae, but the adult is unable to escape from the bag of ''L. omnivora''. ''X. rhopaloceros'' was released in New Zealand in the 1960s as a biocontrol agent against the light brown apple moth
The light brown apple moth (''Epiphyas postvittana'') (often abbreviated to LBAM) is a leafroller moth belonging to the lepidopteran family Tortricidae.
Identification Adult moths
Light brown apple moth adults are variable in colour and may be ...
but was not sufficiently host-specific to have much impact.
Relationship with humans
The cocoon produced by the moth is said in Māori belief to have been a transformation of Raukatauri, the Māori goddess of music. This inspires both the traditional flute instrument pūtōrino and another name given to the insect, ''pū a Raukatauri'' or 'flute of Raukatauri'.References
{{Taxonbar, from=Q13483003 Moths described in 1878 Psychidae Moths of New Zealand Endemic fauna of New Zealand Endemic moths of New Zealand