Autohaemorrhaging

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Horned lizard showing evidence of autohaemorrhaging Phrynosoma orbiculare.JPG
Horned lizard showing evidence of autohaemorrhaging

Autohaemorrhaging, or reflex bleeding, is the action of animals deliberately ejecting blood from their bodies. Autohaemorrhaging has been observed as occurring in two variations. [1] In the first form, blood is squirted toward a predator. The blood of these animals usually contains toxic compounds, making the behaviour an effective chemical defence mechanism. In the second form, blood is not squirted, but is slowly emitted from the animal's body. This form appears to serve a deterrent effect, and is used by animals whose blood does not seem to be toxic. [1] Most animals that autohaemorrhage are insects, but some reptiles also display this behaviour. [2]

Contents

Some organisms have shown an ability to tailor their autohaemorrhaging response. Armoured crickets will projectile autohaemorrhage over longer distances when attacked from the side, compared to being attacked from an overhead predator. [3]

Insects

Several orders of insects have been observed to utilize this defence mechanism.

Reptiles

A West Indian wood snake displaying autohaemorrhaging. The eyes are fully flooded with blood and some is emerging from the mouth. Tropidophis curtus barbouri autohaemorrhaging.jpg
A West Indian wood snake displaying autohaemorrhaging. The eyes are fully flooded with blood and some is emerging from the mouth.

Lizards

Snakes

Consequences of reflexive bleeding

In some cases, the loss of blood can be substantial. Beetles may lose up to 13% of their net body weight as a consequence of expelling haemolymph. [16] Autohaemorrhaging may result in dehydration. The ejection of blood puts organisms at risk of cannibalism from conspecifics. [17]

An inactive prepupa Asian ladybeetle autohaemorrhaging, resulting from cannibalism by an adult of the same species. Canibalism - Reflex bleeding (2106637702).jpg
An inactive prepupa Asian ladybeetle autohaemorrhaging, resulting from cannibalism by an adult of the same species.

See also

Related Research Articles

<span class="mw-page-title-main">Lizard</span> Informal group of reptiles

Lizard is the common name used for all squamate reptiles other than snakes, encompassing over 7,000 species, ranging across all continents except Antarctica, as well as most oceanic island chains. The grouping is paraphyletic as some lizards are more closely related to snakes than they are to other lizards. Lizards range in size from chameleons and geckos a few centimeters long to the 3-meter-long Komodo dragon.

<span class="mw-page-title-main">Hemolymph</span> Body fluid that circulates in the interior of an arthropod body

Hemolymph, or haemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues. It is composed of a fluid plasma in which hemolymph cells called hemocytes are suspended. In addition to hemocytes, the plasma also contains many chemicals. It is the major tissue type of the open circulatory system characteristic of arthropods. In addition, some non-arthropods such as mollusks possess a hemolymphatic circulatory system.

<span class="mw-page-title-main">Froghopper</span> Superfamily of true bugs

The froghoppers, or the superfamily Cercopoidea, are a group of hemipteran insects in the suborder Auchenorrhyncha. Adults are capable of jumping many times their height and length, giving the group their common name, but many species are best known for their plant-sucking nymphs which produce foam shelters, and are referred to as "spittlebugs".

<span class="mw-page-title-main">Greater short-horned lizard</span> Species of reptile

The greater short-horned lizard, also commonly known as the mountain short-horned lizard or Hernández's short-horned lizard, is a species of lizard in the family Phrynosomatidae. The species is endemic to western North America. Like other horned lizards, it is often called a "horned toad" or "horny toad", but it is not a toad at all. It is a reptile, not an amphibian. It is one of seven native species of lizards in Canada.

<span class="mw-page-title-main">Grass snake</span> Species of snake

The grass snake, sometimes called the ringed snake or water snake, is a Eurasian semi-aquatic non-venomous colubrid snake. It is often found near water and feeds almost exclusively on amphibians.

<span class="mw-page-title-main">Grasshopper</span> Common name for a group of insects

Grasshoppers are a group of insects belonging to the suborder Caelifera. They are amongst what are possibly the most ancient living groups of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago.

<span class="mw-page-title-main">Anti-predator adaptation</span> Defensive feature of prey for selective advantage

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<span class="mw-page-title-main">Hognose</span> Common name for several snake species

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<i>Acanthoplus</i> Genus of cricket-like animals

Acanthoplus is a genus of African bush crickets in the subfamily Hetrodinae and tribe Acanthoplini.

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<i>Philaenus spumarius</i> Species of insect

Philaenus spumarius, the meadow froghopper or meadow spittlebug, is a species of insect belonging to the spittlebug family Aphrophoridae. In Italy and America, it is economically important as one of the vectors of Pierce's disease.

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<i>Leioheterodon madagascariensis</i> Species of snake

Leioheterodon madagascariensis, the Malagasy, Madagascar or Madagascangiant hognose(snake), is a harmless species of pseudoxyrhophiid snake endemic to the island nation of Madagascar. The species is also found on the country's smaller islands of Nosy Be, Nosy Mangabe, and Nosy Sakatia, as well as on the Comoros archipelago, in the Mozambique Channel. It is thought, by some, to have been introduced to the Grande Comoro. Mature giant hognose snakes can measure between 130 and 180 cm (4 ft. to nearly 6 ft., or between 1-2 meters) in length, and be roughly the thickness of an average adult human's arm.

Parasanaa is a genus of bush-cricket recorded from India, Indochina, Malesia through to New Guinea. It is represented by a single species, Parasanaa donovani

<span class="mw-page-title-main">Subgenual organ</span>

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<i>Asbolus verrucosus</i> Species of beetle

Asbolus verrucosus(LeConte, 1852), also known as the desert ironclad beetle or blue death feigning beetle, is a species of darkling beetle native to southwestern United States and northwestern Mexico, where it inhabits dry, sandy habitats such as the Sonoran and Mojave Deserts. It is highly adapted to hot environments and is omnivorous, consuming dead insects, fruits, lichen, and other plant matter. When threatened, the beetles are able to feign death. The species is becoming increasingly popular in the pet trade, due to their ease of care, hardiness, and longevity.

<span class="mw-page-title-main">Barred grass snake</span> Species of snake

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References

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