pit viper

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pit viper,

poisonous snakesnake,
common name for an elongated, limbless reptile of the order Squamata, which also includes the xlizards. Most snakes live on the ground, but some are burrowers, arboreal, or aquatic; one group is exclusively marine. In temperate climates they hibernate.
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 of the family Crotalidae, primarily a New World family. Like the Old World true vipersviper,
any of a large number of heavy-bodied, poisonous snakes of the family Viperidae, characterized by erectile, hypodermic fangs. The fangs are folded back against the roof of the mouth except when the snake strikes. Vipers are distributed throughout Eurasia and Africa.
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 (family Viperidae), pit vipers have long, hollow, erectile fangs that are folded back against the roof of the mouth except when the snake is striking. In addition, the pit vipers have developed special organs of heat reception that help them to sense warm-blooded animals, an ability that is especially useful at night, when many of them hunt. These organs consist of pits, for which the group is named, located just behind the nostrils and covered with a temperature-sensitive membrane. Some pit vipers may also use these organs to find cool refuges from inhospitable daytime temperatures.

The largest group of pit vipers is the rattlesnakerattlesnake,
poisonous New World snake of the pit viper family, distinguished by a rattle at the end of the tail. The head is triangular, being widened at the base. The rattle is a series of dried, hollow segments of skin, which, when shaken, make a whirring sound.
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 genus Crotalus, found in North, Central, and N South America. Other New World forms are the fer-de-lancefer-de-lance
, highly poisonous snake, Bothrops atrox, found in tropical South America and the West Indies. A pit viper, related to the bushmaster and the rattlesnake, it has heat-sensitive organs on the head for detecting its warm-blooded prey.
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 (genus Bothrops) and the bushmasterbushmaster,
large venomous snake, Lachesis muta, of Central America and N South America. It is a member of the pit viper family, which also includes the rattlesnake. The largest New World snake, it reaches a length of 8 to 12 ft (2.5–5.5 m).
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 (genus Lachesis). The genus Ancistrodon includes the copperheadcopperhead,
poisonous snake, Ancistrodon contortrix, of the E United States. Like its close relative, the water moccasin, the copperhead is a member of the pit viper family and detects its warm-blooded prey by means of a heat-sensitive organ behind the nostril.
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 and water moccasinwater moccasin
or cottonmouth,
highly venomous snake, Ancistrodon piscivorus, of the swamps and bayous of the S United States. Like the closely related copperhead, it is a pit viper and has a heat-sensitive organ for detecting warm-blooded prey.
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, as well as about a dozen Asian species. Pit vipers are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, family Crotalidae.

References in periodicals archive ?
The two newest products in the Pit Viper family of rotary drill rigs will be unveiled.
The bite of most pit vipers is called "hemotoxic," meaning that its venom disrupts the integrity of blood vessels.
RCS is the company's foundation for implementing various levels of automation, and automation packages are available for any of its Pit Viper rotary blasthole drill rigs.
Bayesian mixed models and the phylogeny of pit vipers (Viperidae: Serpentes).
Venoms of true vipers (Viperinae) and of pit vipers (Crotalinae) contain hemotoxins, e.
These figures indicate that with an assumed dosage of 5 vials per envenomed victim, based on dosages of an existing monovalent anti snake venom for the Malayan pit viper (Callesolasma rhodostoma) and Russell's viper (Daboia siamensis), a total South East Asian Polyvalent anti snake venom requirement would be approximately 400,000 vials per annum.
The western cottonmouth, Agkistrodon piscivorus leucostoma, is an iteroparous pit viper that inhabits a wide variety of habitats (Gloyd and Conant, 1990; Werler and Dixon, 2000).
Pit vipers get their name from the tiny, heat-sensing (and thus prey-detecting) pit located on each side of the head, between the eye and nostril.
The pit vipers are habitually nocturnal; nonetheless juveniles of the two species forage for frogs by day on the stream banks.
Luckily, the copperhead is the least dangerous of the pit vipers, and many patients bitten by them may not need antivenin therapy.