Praying mantis
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[Photo] Adult Large Brown Mantid, Archimantis latistyla. Taken in Swifts Creek, Victoria in Jan 2006. Specimen size is approx 11cm. Photo by http://en.wikipedia.org/wiki/User:Fir0002 | Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". |
A praying mantis, or praying mantid, is the common name for an insect of the order Mantodea. Often mistakenly spelled preying mantis (an eggcorn, since they are notoriously predatory), they are in fact named for the typical "prayer-like" stance. The word mantis derives from the Greek word mantis for prophet or fortune teller. The preferred pluralization is mantids, though there is some usage of mantes or mantises.
Like all insects, a praying mantis has a three- segmented body, with a head, thorax and abdomen. The abdomen is elongated and covered by the wings in adults. Females have strong and large cerci. The first thoracic segment, the prothorax, is elongated and from it arises the modified foreleg.
Senses
Mantids, with their huge compound eyes mounted on a triangular head, have a large field of vision. They use sight for detecting movement of prey and swivel their heads to bring their prey into a binocular field of view. They have a fully articulated head, and are able to swivel it 180 degrees as well as pivot it. Their antennae are used for smell.
Habitat
Praying mantids can be found in all parts of the world with mild winters and sufficient vegetation. Praying mantids will spend most of their time in a garden, forest or other vegetated area.
Diet
Being a carnivorous insect, the mantis feeds primarily on other insects. However, it is not uncommon for larger mantids to consume small reptiles, birds and even small mammals.
To capture their prey, mantids use their camouflage to blend in with the surroundings and wait for the prey to be within striking distance. They then use their raptorial front legs to quickly snatch the victim and devour it.
Predators
The primary predators of the praying mantis are frogs, monkeys, larger birds, spiders and snakes. Praying mantids will also prey on each other, usually during the nymph stage and during mating (Patterson), as well as when there is no other prey.
Defense mechanisms
When threatened, praying mantids stand tall and spread their forelegs to allow them to penetrate the target, with their wings fanning out wide and mouths open. The fanning of the wings is used to make the mantis seem larger and to scare the opponent, with some species having bright colors and patterns on their hind wings and inner surfaces of their front legs for this purpose. If harassment persists, the mantis will then strike with their forelegs and attempt to pinch, bite or slash. They also may make a hissing sound.
Mantids do not develop wings until the final molt. Some mantids do not develop wings at all, or may have small flightless wings. The only time mantids fly is when the adult female begins to emit pheromones which attract males for mating. Contrary to popular belief, not all males become the meal of the female. Male mantids fly at night, as they seem to be attracted to artificial lights.
Bats, one of the mantid's natural predators, feed at night when the males are busy locating a mate. Bats use echolocation to pinpoint their prey. According to Yager and May, praying mantids are able to hear these sounds and when the frequency begins to increase rapidly, indicating an approaching bat, mantids will stop flying horizontally and begin a descending spiral toward the safety of the ground. Often this descent will be preceded by an aerial loop or spin. Other times, the entire descent will consist of a downward spiral.
Reproduction
The reproductive process in a majority of mantis species is marked by sexual cannibalism of the male by the female, and is an ongoing subject of research. The reason for sexual cannibalism has been the subject of some debate, with some considering submissive males to be achieving a selective advantage in their ability to produce offspring. This theory is supported by a quantifiable increase in the duration of copulation among male mantids who are cannibalized, in some cases doubling both the duration and the chance of fertilization. This is further supported in a study by J. P. Lelito and W. D. Brown where male mantids were seen to approach hungry females with more caution, and were shown to remain mounted on hungry females for a longer time, indicating that males actively avoiding cannibalism may mate with multiple females. The act of dismounting is one of the most dangerous times for male mantids during copulation, for it is at this time that female mantids most frequently cannibalize their mates. This increase in mounting duration was thought to indicate that males would be more prone to wait for an opportune time to dismount from a hungry female rather than from a satiated female that would be less likely to cannibalize its mate. Some consider this to be an indication that male submissiveness does not inherently increase male reproductive success, rather that more fit males are likely to approach a female with caution and escape.
Endangered status
Most North American mantids are not included among endangered species, but species in other parts of the world are under threat from habitat destruction. They are protected in Connecticut, as they are the state insect.
Pest control
Mantids will consume any insect. If released in very large numbers they will cause a reduction in the number of pest insects so can be released by the hundreds, in batches throughout the season. Smaller mantids will consume aphids, fruit flies, mites, gnats and mosquitoes. Larger mantids consume flying roaches, crickets, some species of grasshopper, some species of beetles, moths, flies and other larger insects. Rarely, mantids will consume small birds. The USDA lists mantids as a beneficial insect.
Hundreds of thousands of dollars per year are spent by gardening enthusiasts who find the release of mantids to be effective.
Lifespan
Praying mantids start out life in an ootheca egg mass. Usually laid in the fall on a small branch or twig, the egg mass then hatches in the spring to early summer as warming temperatures signal the time for birth.
The natural lifespan of a praying mantis in the wild is about 10 - 12 months, but some mantids kept in captivity have been sustained for 14 months. In colder areas, female mantids will die during the winter. Males tend to "suddenly" die about 2 to 3 weeks after mating in the fall. This is usually caused by the female's urge to kill off the male once the egg pouch has been produced. (U.S. Mantids)
Species
There are approximately 2,000 mantid species worldwide, the majority are found in Asia. About 20 species are native to the USA. Two species (Chinese Mantis, T. sinensis and European Mantis, M. religiosa) were deliberately introduced to serve as pest control for agriculture. While it's legal to keep USA-native mantids in the USA, other non indigenous varieties are illegal to possess and release in the United States. Some prohibited mantids are the spiny flower mantis, orchid mantis, wondering violin mantis, ghost mantis, devils flower mantis, and Egyptian mantis. These and others are illegal under the Non Native Invasive Species Act of 1992.
http://en.wikipedia.org/wiki/Praying_mantis
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