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Agkistrodon acutus

Basic information:

Chinese name:尖吻蝮
Latin name: Deinagkistrodon acutus  
English name: Agkistrodon acutus Sharp - snouted fu  Hundred-pace pitviper  Hundred-pace pitviper  Long-nosed pitviper  Long-nosed pitviper , Sharp-nosed Viper



Back is light brown or greyish brown, with a series of dark brown lateral triangles on each side. The two pointed tops of the two opposite triangles meet each other at the mid-line, forming a series of about twenty light brown, squarish blotches on the back. A row of large black spots extends along each side near the belly. The top and upper sides of the head are uniformly black, with a black streak from the eye to the angle of the mouth; yellowish below, spotted with dark brown. The young are much lighter than the adults with essentially the same pattern. The head is large, triangular, with an upturned snout. The body is very stout. The tail is short, ending in a compressed, pointed slightly curved cornified scale. The top of the head is covered with nine large shields. Dorsal scales are strongly and tubercularly keeled. The subcaudals are mostly in pairs, some of the anterior ones are single. This stout snake, usually between 0.8 and 1.0 metre (2.6 and 3.3 ft) long, reaches a maximum length of 1.57 metres (5.2 ft) in males and 1.41 metres (4.6 ft) in females.[6] The largest specimen on record measured approximately 61 inches or 1.549 metres (5.08 ft).


Geographic range

Found in southern China (Zhejiang, Fujian, Hunan, Hubei, Guangdong), Taiwan, northern Vietnam, and possibly Laos. The type locality was not included in the original description. It was later given as "Wusueh [Wu-hsueh], Hupeh Province, China" by Pratt (1892) and Pope (1935). Listed as "Mountains N. of Kiu Kiang" in the catalogue of the British Museum of Natural History.



Dangerous animals often have exaggerated reputations and this species is no exception. The popular name "hundred pacer" refers to a local belief that, after being bitten, the victim will only be able to walk 100 steps before dying. In some areas, it has even been called the "fifty pacer." Nevertheless, this species is considered dangerous, and fatalities are not unusual. An antivenom is produced in Taiwan.

The venom toxicity: LD50 (toxicity) values for NIH MICE(i.p) within 48 hours is

According to the US Armed Forces Pest Managent Board, the venom is a potent hemotoxin that is strongly hemorrhagic. Bite symptoms include severe local pain and bleeding that may begin almost immediately. This is followed by considerable swelling, blistering, necrosis, and ulceration. Systemic symptoms, which often include heart palpitations, may occur suddenly and relatively soon after the bite.[3] Because of its body size and large hinged fangs which permit effective delivery of large quantities of venom, victims bitten by this snake should be treated accordingly.


Preventive measures:

1. When a field trip, work, especially in the night'd better wear trousers, tic boot, the sticks or stick, and carry lighting tools, prevent trample to snake body incur bite.  

2. Choose cantonment, want to avoid the grass and cleft, bushes, such as bamboo dark wet places.


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