''Atheris rungweensis'', commonly known as the Rungwe tree viper,Spawls S, Branch B. 1995. ''The Dangerous Snakes of Africa''. Ralph Curtis Books. Dubai: Oriental Press. 192 pp. .Mallow D, Ludwig D, Nilson G. 2003. ''True Vipers: Natural History and Toxinology of Old World Vipers''. Malabar, Florida: Krieger Publishing Company. 359 pp. . Mt Rungwe bush viper, and Rungwe leaf viper,Mehrtens JM. 1987. ''Living Snakes of the World in Color''. New York: Sterling Publishers. 480 pp. . is a species of venomous

viper The Viperidae (vipers) are a family of snakes found in most parts of the world, except for Antarctica, Australia, Hawaii, Madagascar, and various other isolated islands. They are venomous and have long (relative to non-vipers), hinged fangs tha ...

found in East Africa.

Taxonomy

The specific name is derived from the species type locality in the Rungwe Mountains. It was formerly considered as a

subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...

of '' Atheris nitschei''.

Description

It grows to a maximum length (body + tail) of . At midbody, it has 22–33

dorsal scale In snakes, the dorsal scales are the longitudinal series of plates that encircle the body, but do not include the ventral scales. Campbell JA, Lamar WW (2004). ''The Venomous Reptiles of the Western Hemisphere''. Ithaca and London: Comstock Publis ...

rows. The

ventral scales In snakes, the ventral scales or gastrosteges are the enlarged and transversely elongated scales that extend down the underside of the body from the neck to the anal scale. When counting them, the first is the anteriormost ventral scale that conta ...

number 150–165, and the subcaudals 46–58. The color pattern is variable, with a ground color that ranges from bright green to green to black. Usually, this is overlaid with a pair of yellow dorsolateral zigzag lines. A row of yellow spots on the sides of the ventral scales may also be present. Specimens from the Sumbawanga region usually have a green yellow and black color pattern. Neonates are a dark brown or gray, but with a bright yellow tail tip.Spawls S, Howell K, Drewes R, Ashe J. 2004. ''A Field Guide to the Reptiles of East Africa''. London: A & C Black Publishers Ltd. 543 pp. .

Distribution and habitate

''Atheris rungweensis'' is known from scattered locations from south-western Tanzania to north-eastern Zambia and south to the

Nyika Plateau The Nyika Plateau lies in northern Malawi, with a small portion in north eastern Zambia. Most of it lies at elevations of between , the highest point being at Nganda Peak. It is roughly a diamond in shape, with a long north–south axis of about ...

in northern Malawi. ''Atheris rungweensis'' is usually found in low

bushes A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...

along

stream A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a stream ...

s and at the edges of

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited Summit (topography), summit area, and ...

forest A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...

s at altitudes of . Occasionally, it is encountered in moist

savanna A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to ...

woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the ''plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...

, and

hill A hill is a landform that extends above the surrounding terrain. It often has a distinct Summit (topography), summit. Terminology The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally con ...

forest

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

Taxonomy

Description

Distribution and habitate

References

Further reading