Lethocerus insulanus

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Lethocerus insulanus
Lethocerus insulanus (two).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hemiptera
Suborder: Heteroptera
Family: Belostomatidae
Genus: Lethocerus
Species:
L. insulanus
Binomial name
Lethocerus insulanus
(Montandon, 1898)

Lethocerus insulanus is a species of giant water bug of the family Belostomatidae. Its common name is the Australian giant water bug, but it is also called the electric light bug or giant fishkiller. These names are also used for various other members of the family, including the other Australian species, L. distinctifemur , which is similar to L. insulanus. [1]

Contents

Distribution

Lethocerus insulanus is found in Australia, Papua New Guinea and New Caledonia. [2] In Australia its distribution corresponds closely with the tropical and humid subtropical climate zones, including coastal and subcoastal Queensland and New South Wales as well as much of the Northern Territory. It is absent from southern areas of the continent including all of Victoria, South Australia and Tasmania.

It inhabits still, freshwater bodies such as lakes [3] and can also be found in floodwaters.

Description

Lethocerus insulanus is a large insect and among the largest of the belostomatids, with adults typically reaching a length of 50–70 mm (2.0–2.8 in). It is the largest true bug species in Australia. [1] It uses a posterior syphon like a snorkel to breathe underwater while hunting. It is an ambush predator of fish, reptiles, frogs and aquatic invertebrates and spends most of its time motionless in the water column. L. insulanus is winged and readily flies for the purposes of mating or finding new habitat. [3]

Relationship with humans

The larger belostomatids are colloquially called "toe biters" throughout the parts of the world where they occur. Indeed, L. insulanus is capable of a highly painful "bite" if stood on, handled or disturbed. [3] As hemipteran insects do not possess biting mouthparts, this is not a true bite but involves the water bug piercing the subject's skin with its modified proboscis or rostrum and introducing a combination of salivary enzymes, including proteases and amylase, the usual function of which is to incapacitate and digest its prey. [4] This "venom" causes pain, localised tissue damage and swelling. There are no systemic effects however salivary proteases from insects are allergens known to cause anaphylaxis in some individuals. [5]

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<span class="mw-page-title-main">Hemiptera</span> Order of insects often called true bugs

Hemiptera is an order of insects, commonly called true bugs, comprising over 80,000 species within groups such as the cicadas, aphids, planthoppers, leafhoppers, assassin bugs, bed bugs, and shield bugs. They range in size from 1 mm (0.04 in) to around 15 cm (6 in), and share a common arrangement of piercing-sucking mouthparts. The name "true bugs" is often limited to the suborder Heteroptera.

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

The Reduviidae is a large cosmopolitan family of the suborder Heteroptera of the order Hemiptera. Among the Hemiptera and together with the Nabidae almost all species are terrestrial ambush predators; most other predatory Hemiptera are aquatic. The main examples of nonpredatory Reduviidae are some blood-sucking ectoparasites in the subfamily Triatominae. Though spectacular exceptions are known, most members of the family are fairly easily recognizable; they have a relatively narrow neck, sturdy build, and a formidable curved proboscis. Large specimens should be handled with caution, if at all, because they sometimes defend themselves with a very painful stab from the proboscis.

<span class="mw-page-title-main">Perentie</span> Species of lizard

The perentie is a species of monitor lizard. It is one of the largest living lizards on earth, after the Komodo dragon, Asian water monitor, and the Crocodile monitor. Found west of the Great Dividing Range in the arid areas of Australia, it is rarely seen, because of its shyness and the remoteness of much of its range from human habitation. The species is considered to be a least-concern species according to the International Union for Conservation of Nature.

<span class="mw-page-title-main">Belostomatidae</span> Family of true bugs

Belostomatidae is a family of freshwater hemipteran insects known as giant water bugs or colloquially as toe-biters, Indian toe-biters, electric-light bugs, alligator ticks, or alligator fleas. They are the largest insects in the order Hemiptera. There are about 170 species found in freshwater habitats worldwide, with more than 110 in the Neotropics, more than 20 in Africa, almost as many in the Nearctic, and far fewer elsewhere. These predators are typically encountered in freshwater ponds, marshes and slow-flowing streams. Most species are at least 2 cm (0.8 in) long, although smaller species, down to 0.9 cm (0.35 in), also exist. The largest are members of the genus Lethocerus, which can exceed 12 cm (4.5 in) and nearly reach the length of some of the largest beetles in the world. Giant water bugs are a popular food in parts of Asia.

<span class="mw-page-title-main">Nepomorpha</span> Infraorder of true bugs

Nepomorpha is an infraorder of insects in the "true bug" order (Hemiptera). They belong to the "typical" bugs of the suborder Heteroptera. Due to their aquatic habits, these animals are known as true water bugs. They occur all over the world outside the polar regions, with about 2,000 species altogether. The Nepomorpha can be distinguished from related Heteroptera by their missing or vestigial ocelli. Also, as referred to by the obsolete name Cryptocerata, their antennae are reduced, with weak muscles, and usually carried tucked against the head.

<i>Lethocerus indicus</i> Species of true bug

Lethocerus indicus is a giant water bug in the family Belostomatidae, native to South and Southeast Asia, as well as southeast China, the Ryukyu Islands, and New Guinea. It was originally described as Belostoma indicum but is no longer placed in that genus.

<i>Lethocerus deyrollei</i> Species of true bug

Lethocerus deyrollei is a species of giant water bug that traditionally is included in the genus Lethocerus, although recent authorities place it in the monotypic Kirkaldyia. They are large, predatory and nocturnal insects. They are one of the best known giant water bugs and are found in Japan, Korea, east China, east Indochina and the Amur region of Russia. They are very common in much of their range, but have declined drastically in some regions and are considered threatened in Japan and Korea. They live in still waters with vegetation, hatching in the summer months and then overwintering half a year later as adults. They primarily feed on small fish, amphibians and aquatic insects, but have also been recorded taking water snakes and young turtles.

<i>Lethocerus</i> Genus of true bugs

Lethocerus is a genus of the hemipteran family Belostomatidae, known colloquially as giant water bugs, toe biters and electric light bugs, distributed in tropical, subtropical and temperate areas of the world. The greatest diversity of species occurs in the Americas, with only a single species in Europe, two in Africa, two in Australia and three in Asia. It includes the largest true bugs with species capable of reaching a length of over 12 centimetres (4.7 in). The South American L. grandis and L. maximus are the only species to commonly exceed 9 cm (3.5 in), with more typical lengths for the remaining species being between 4.5 and 9 cm. Lethocerus sp. are distinguished from other genera in the Lethocerinae by two symmetrical furrows in the inner pad of setae on the fore femur, the external borders of parasternites II and III narrowed and nearly straight, and with the setae of the tarsomeres following the line of the tibial setae.

<i>Lethocerus americanus</i> Species of true bug

Lethocerus americanus, sometimes called the electric light bug, toe biter or fish killer, is a giant water bug in the family Belostomatidae, native to southern Canada and the United States. It typically has a length around 5–6 cm (2.0–2.4 in). It was originally classified as a species in genus Belostoma.

<span class="mw-page-title-main">Arthropod bites and stings</span> Medical condition

Many species of arthropods can bite or sting human beings. These bites and stings generally occur as a defense mechanism or during normal arthropod feeding. While most cases cause self-limited irritation, medically relevant complications include envenomation, allergic reactions, and transmission of vector-borne diseases.

<i>Abedus</i> Genus of true bugs

Abedus is a genus of giant water bugs found in freshwater habitats in southern United States, Mexico and Central America. Sometimes called ferocious water bugs, these brown insects typically are between 2.3 and 4 cm (0.9–1.6 in) long, although A. immaculatus only is about 1.3–1.4 cm (0.51–0.55 in), making it the smallest North American belostomatid and possibly worthy of separation in its own genus. Otherwise the different Abedus species are very similar and can often only be separated with a microscope. They will bite in self-defense, which is painful but not dangerous.

<i>Lethocerus patruelis</i> Species of true bug

Lethocerus patruelis is a giant water bug in the family Belostomatidae. It is native to southeastern Europe, through Southwest Asia, to Pakistan, India and Burma. It is the largest European true bug and aquatic insect. Adult females are typically 7–8 cm (2.8–3.1 in) long, while the adult males are 6–7 cm (2.4–2.8 in).

<i>Belostoma</i> Genus of true bugs

Belostoma is a genus of insects in the hemipteran family Belostomatidae, known colloquially as giant water bugs. Members of this genus are native to freshwater habitats in the Americas, with the greatest species richness in tropical South America. Most species in the family Belostomatidae have historically been included in Belostoma, but several of these have been moved to other genera. 9 species are claimed to be found in Northern America, but the genus Belostoma is actually divided into 16 subgroups containing about 70 species.

<i>Abedus herberti</i> Species of true bug

Abedus herberti, the toe biter or ferocious water bug, is a species of giant water bug in the family Belostomatidae. It is native to streams, especially in highlands, in Arizona, New Mexico and Utah in the United States and in northwestern Mexico. Adults are typically 2 to 4 cm (0.8–1.6 in) long. The species is flightless, but may move overland between water sources. It will bite in self-defense, which is painful but not dangerous.

<i>Lethocerus uhleri</i> Species of true bug

Lethocerus uhleri, or Uhler's water bug, is a species of giant water bug in the family Belostomatidae. It is found in eastern North America from New York, Michigan, and Wisconsin south to Florida and northern Tamaulipas.

<i>Lethocerus medius</i> Species of true bug

Lethocerus medius is a species of giant water bug in the family Belostomatidae. It is found in Central America from northern Panama north throughout Mexico to southern Arizona, New Mexico, and Texas in the United States, and Cuba, Jamaica, the Cayman Islands, and the Bahamas.

<i>Appasus japonicus</i> Species of true bug

Appasus japonicus is a species of giant water bug in the family Belostomatidae. It is found in Japan and Korea, and has been much studied because it provides an example, rare among insects, of paternal care of the young. With the destruction of its typical habitat and its poor dispersal abilities, it has been listed as being an endangered species in Japan.

<i>Benacus</i> (bug) Genus of true bugs

Benacus is a genus of giant water bug in the hemipteran family Belostomatidae. Benacus is a monotypic genus, containing a single species, B. griseus, which is found in North America. Benacus was formerly considered a subgenus of Lethocerus.

<i>Benacus griseus</i> Species of true bug

Benacus griseus is a species of giant water bug in the family Belostomatidae. It is the only species in the genus Benacus, which was formerly considered a subgenus of Lethocerus.

References

  1. 1 2 P. J. Perez-Goodwyn (2006). Taxonomic revision of the subfamily Lethocerinae Lauck & Menke (Heteroptera: Belostomatidae)". Stuttgarter Beiträge zur Naturkunde. A (Biologie) 695: 1–71.
  2. Species Lethocerus (Lethocerus) insulanus (Montandon, 1898), Australian Faunal Directory, Department of the Environment, 30 November 2012.
  3. 1 2 3 Giant Water Bug, Australian Museum.
  4. Belostomatidae, Australian Faunal Directory.
  5. Wolfgang Hemme, Felix Wantke. Insect hypersensitivity beyond bee and wasp venom allergy. Allergologie select 2020 [4]:97-104 PMID 33275648