Vipera Ammodytes

''Vipera ammodytes'' (other common names include horned viper, long-nosed viper, nose-horned viper, sand viper)Street, D. 1979. ''The Reptiles of Northern and Central Europe''. London: B.T. Batsford Ltd. 268 pp. . is a viper species found in southern Europe, mainly northern Italy, the Balkans, and parts of Asia Minor. Like all other vipers, it is venomous. It is reputed to be the most dangerous of the European vipers due to its large size, long fangs (up to 13 mm) and high venom toxicity.Mallow, D., Ludwig, D., Nilson, G. 2003. ''True Vipers: Natural History and Toxinology of Old World Vipers''. Malabar, Florida: Krieger Publishing Company. 359 pp. . The specific name, ''ammodytes'', is derived from the Greek words ''ammos'', meaning "sand", and ''dutes'', meaning "burrower" or "diver", despite its preference for rocky habitats.Gotch, A.F. 1986. ''Reptiles – Their Latin Names Explained''. Poole, UK: Blandford Press. 176 pp. . Five subspecies are currently recognized, including the nominate subspecies described here.

Description

''V. ammodytes'' grows to an average total length (snout-tail) of , although individuals usually measure less than . Maximum length also depends on locality, with northern forms distinctly larger than southern ones. In one field study on Golem Grad island (in North Macedonia), for example, females averaged 35 cm., and males at 37 cm.; the largest captured during the study was a male, at 66 cm. long. This indicates some degree of regional or insular dwarfism.

The head is covered in small, irregular scales, that are either smooth or only weakly-keeled; a pair of large supraocular scales also extends beyond the posterior margin of the eye. Ten to thirteen small scales surround each eye, and two rows separate the eye from the supralabials. The nasal scale is large, single (rarely divided), and separated from the rostral by a single nasorostral scale. The rostral scale is wider than it is long.

The most distinctive characteristic is a single "horn" on the snout, just above the rostral scale. It consists of approximately nine to seventeen small scales, arranged in two (occasionally three or four) transverse rows. It grows to a length of about and is actually soft and flexible. In southern subspecies, the horn sits vertically upright, while in ''V. a. Ammodytes'' it points diagonally forward.

The body is covered with strongly keeled dorsal scales, in 21 to 23 rows (rarely 25), at mid-body. The scales bordering the ventrals are smooth or weakly-keeled. Males have anywhere from 133 to 161 ventral scales and 27 to 46 paired subcaudals. Females have between 135 to 164, and 24 to 38, respectively. The anal scale is single.

The color pattern is different for males and females. In males, the head has irregular dark brown, dark gray, or black markings. A thick, black stripe runs from behind the eye to behind the angle of the jaw. The tongue is usually black, and the iris has a golden or coppery color. Males have a characteristic dark blotch or V marking on the back of the head that often connects to the dorsal zigzag pattern. The ground color for males varies and includes many different shades of gray, sometimes yellowish or pinkish gray, or yellowish brown. The dorsal zigzag is dark gray or black, the edge of which is sometimes darker. A row of indistinct, dark (occasionally yellowish) spots runs along each side, sometimes joined in a wavy band.

Females have a similar color pattern, except that it is less distinct and contrasting. They usually lack the dark blotch or V-shaped marking (on the back of the head) that the males have. Ground color is variable, and tends more towards browns and bronzes; grayish-brown, reddish-brown, copper, "dirty cream", or brick red. The dorsal zigzag is a shade of brown.

Both sexes have a zigzag dorsal stripe, set against a lighter background. This pattern is often fragmented. The belly color varies, and can be grayish, yellowish-brown, or pinkish and "heavily clouded", or with dark spots. Sometimes, the ventral color is black or bluish gray, with white flecks and inclusions edged in white. The chin is lighter in color than the belly. Underneath, the tip of the tail may be yellow, orange, orange-red, red, or green. Melanism does occur, but is rare. Juvenile color patterns are about the same as the adults. The cinderella snake may be between the rail and a ballast prism, accumulating solar heat in her body.

Common names

The common names that can be found for Vipera ammodytes in English are horned viper, long-nosed viper, nose-horned viper, sand viper, sand adder, common sand adder, common sand viper,Mehrtens, J.M. 1987. ''Living Snakes of the World in Color''. New York: Sterling Publishers. 480 pp. . and sand natter.U.S. Navy. 1991. ''Poisonous Snakes of the World''. US Govt. New York: Dover Publications Inc. 203 pp. . In Croatia, Bosnia and Herzegovina, North Macedonia, and Serbia, a common name used for this snake is poskok (поскок), meaning 'hopper'.

Geographic range

North-eastern Italy, Slovenia, Croatia, Bosnia-Herzegovina, Serbia, Montenegro, Albania, Kosovo, North Macedonia, Greece (including Cyclades), southern Austria, Romania, Bulgaria, Turkey, Georgia and Syria.

The type locality is listed as "Oriente". Schwarz (1936) proposed that the type locality be restricted to "Zara" (Zadar, Croatia).

Conservation status

This species is listed as strictly protected (Appendix II) under the Berne Convention.Convention on the Conservation of European Wildlife and Natural Habitats, Appendix II
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Council of Europe
Accessed 9 October 2006.

Habitat

The common name ''sand viper'' is misleading, as this species does not occur in mostly sandy areas.Steward, J.W. 1971. ''The Snakes of Europe''. Cranbury, New Jersey: Associated University Press (Fairleigh Dickinson University Press). 238 pp. LCCCN 77-163307. . ''V. ammodytes'' primarily inhabits dry, rocky hillsides with sparse vegetation. Not usually associated with woodlands, but if so it will be found there around the edges and in clearings. Sometimes found in areas of human habitation, such as railway embankments, farmland, and especially vineyards if rubble piles and stone walls are present. May be found above 2000 m at lower latitudes.

Behaviour

This species has no particular preference for its daily activity period. At higher altitudes, it is more active during the day. At lower altitudes, it may be found at any time of the day, becoming increasingly nocturnal as daytime temperatures rise.

Despite its reputation, this species is generally lethargic, not at all aggressive, and tends not to bite without considerable provocation. If surprised, wild specimens may react in a number of different ways. Some remain motionless and hiss loudly, some hiss and then flee, while still others will attempt to bite immediately.

''Vipera ammodytes'' hibernates in the winter for a period of 2 to 6 months depending on environmental conditions.Strugariu, A. 2006
The European Horn-Nosed Viper
. VenomousReptiles.org.

Feeding

Adults generally feed on small mammals and birds, whilst juveniles predominantly eat lizards. Feeding behavior changes and is influenced heavily by prey size. Larger prey are struck, released, tracked, and swallowed, while smaller prey is swallowed without using the venom apparatus. Occasionally, other snakes are eaten. There are also reports of cannibalism. Arthropods such as large insects and centipedes have regularly been found in the stomach contents of vipers, albeit more frequently in juveniles that eat centipedes like Mediterranean banded centipede.

Reproduction

Before mating, the males of this species will engage in a combat dance, similar to adders. Mating takes place in the spring (April–May), and one to twenty live young are born in late summer or fall (August–October). At birth, juveniles are in total length. This species is ovoviviparous.Stidworthy, J. 1974. ''Snakes of the World''. Grosset & Dunlap Inc. .

Captivity

This species has often been kept in captivity and bred successfully. It tolerates captivity much better than other European vipers, thriving in most surroundings and usually taking food easily from the start. However, as far as handling is concerned, despite its relatively placid reputation, pinning and necking this snake can be risky, as they are relatively strong and can unexpectedly jerk free from a keeper's grasp. For close examinations, it is therefore advisable to use a clear plastic restraining tube instead.

Venom

This is likely the most dangerous snake to be found in Europe.Arnold, E.N.; Burton, J.A. 1978. A Field Guide to the Reptiles and Amphibians of Britain and Europe. London: Collins. 272 pp. . (Vipera ammodytes, pp. 222–223 + Plate 40 + Map 125.) In some areas it is at least a significant medical risk.

The venom can be quite toxic ased on tests conducted solely on mice but varies over time and among different populations. Brown (1973) gives an for mice of 1.2 mg/kg IV, 1.5 mg/kg IP and 2.0 mg/kg SC.Brown, J.H. 1973. ''Toxicology and Pharmacology of Venoms from Poisonous Snakes''. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73–229. . Novak ''et al.'' (1973) give ranges of 0.44–0.82 mg/kg and IV and 0.19–0.64 mg/kg IP. Minton (1974) states 6.6 mg/kg SC.

The venom has both proteolytic and neurotoxic components and contains hemotoxins with blood coagulant properties, similar to and as powerful as in crotaline venom. Other properties include anticoagulant effects, hemoconcentration and hemorrhage. Bites promote symptoms typical of viperid envenomation, such as pain, swelling and discoloration, all of which may be immediate. There are also reports of dizziness and tingling. The venom is rarely deadly when hospital care is available.

Humans respond rapidly to this venom, as do mice and birds. Lizards are less affected, while amphibians may even survive a bite. European snakes, such as ''Coronella'' and ''Natrix'', are possibly immune.

''Vipera ammodytes'' venom is used in the production of antivenin for the bite of other European vipers and the snake is farmed for this purpose.

Taxonomy

This species was originally described by Carl Linnaeus in ''Systema Naturae'' in 1758. Subsequently, George Albert Boulenger described a number of subspecies in the early 20th century that are still mostly recognized today. However, there are many alternative taxonomies. One additional subspecies that may be encountered in literature is ''V. a. ruffoi'' (Bruno, 1968), found in the Alpine region of Italy. However, many consider both ''V. a. ruffoi'' and ''V. a. gregorwalineri'' to be synonymous with ''V. a. ammodytes'', and consider ''V. a. transcaucasiana'' to be a separate species.

References

Further reading

* Biella, H.-J. 1983. ''Die Sandotter''. Die Neue Brehm-Bücherei. A. Ziemsen Verlag. Wittenberg Lutherstadt. 84 pp.
* Bruno, S. 1968. ''Sulla ''Vipera ammodytes'' in Italia''. ''Memorie del Museo Civico di Storia Naturale, Verona'' 15: 289–386.
* Copley, A.; Banerjee, S.; Devi, A. 1973. Studies of snake venom on blood coagulation. Part I: The thromboserpentin (thrombin-like) enzyme in the venoms. ''Thromb. Res.'' 2: 487–508.
* Gulden, J. 1988. Hibernation and breeding of ''V. ammodytes ammodytes''. ''Litteratura Serpentium'' 8: 168–72.
* Hays, W.S.T.; Conant, Sheila. 2007. Biology and Impacts of Pacific Island Invasive Species. 1. A Worldwide Review of Effects of the Small Indian Mongoose, Herpestes javanicus (Carnivora: Herpestidae). ''Pacific Science'' 61 (1): 3–16.
* Linnaeus, C. 1758. ''Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, diferentiis, synonymis, locis. Tomus I. Editio Decima, Reformata.'' Stockholm: L. Salvius. 824 pp. (''Coluber ammodytes'', pp. 216–217.)
* Nikolsky, A.M. 1916. ''Fauna of Russia and adjacent countries. Volume II: Ophidia''. Petrograd: Translation from the Israel Program for Scientific Translations, Jerusalem, 1964, 247 pp.
* Meier, J.; Stocker, K.F. 1991. "Snake venom protein C activators". In: Tu, A., editor. ''Reptile venoms and Toxins''. New York: Marcel Dekker. pp. 265–79.
* Mertens, R.; Wermuth, H. 1960. ''Die Amphibien und Reptilien Europas''. Frankfurt am Main: Verlag Waldemar Kramer. 264 pp.
* McMahon, M. 1990. ''Vipera ammodytes meridonalis'' envenomation. ''Journal of the Herpetological Association of Africa'' 37: 60.
* Petkovic, D.; Javanovic, T.; Micevic, D.; Unkovic-Cvetkovic, N.; Cvetkovic, M. 1979. Action of ''Vipera ammodytes'' venom and its fractionation on the isolated rat heart. ''Toxicon'' 17: 639–644.
*Plettenberg Laing, A. 2020. Observations on the diet of the nose-horned viper (''Vipera ammodytes'') in Greece. ''Herpetological Bulletin'', 153, pp. 37–39.
* Schwarz E. 1936. ''Untersuchungen über Systematik und Verbreitung der europäischen und mediterranen Ottern.'' In: ''Die europäischen und mediterranen Ottern und ihre Gifte. Behringwerk-Mitteilungen'' 7: 159–362.

External links

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''Vipera ammodytes''
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Amphibians and Reptiles of Europe
Accessed 7 October 2006.


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Faculty of Biology and Geology
"Babes-Bolyai" University, Romania. Accessed 7 October 2006.


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Club100
Accessed 7 October 2006.


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Amphibians & Reptiles in Bulgaria and Balkan Peninsula
Accessed 7 October 2006.


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VipersGarden
Accessed 7 October 2006.
* Accessed 4 November 2006.

''Vipera ammodytes'' giving birth in terrarium.
pictures provided b
Terrarium Morbidum
Accessed 4 June 2009.

{{Authority control

ammodytes
Reptiles of Europe
Reptiles of Western Asia
Reptiles of Armenia
Reptiles of Azerbaijan
Reptiles described in 1758
Taxa named by Carl Linnaeus