:''Common names: sunbeam snake, common sunbeam snake, iridescent snake.Mehrtens JM. 1987. ''Living Snakes of the World in Color''. New York: Sterling Publishers. 480 pp. .'' ''Xenopeltis unicolor'' is a non-venomous

sunbeam snake ''Xenopeltis'', the sunbeam snakes, are the sole genus of the monotypic family Xenopeltidae, the species of which are found in Southeast Asia. Sunbeam snakes are known for their highly iridescent scales. Two species are recognized, each one with ...

species found in Southeast Asia and some regions of Indonesia. This is a primitive snake known for both its highly iridescent scales and its ability to reproduce quickly, as it is

oviparous Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, most reptiles, and all pterosaurs, dinosaurs (including birds), and ...

and as such can lay up to 10 eggs at a time. No

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 ...

are currently recognized.

Description

Grows to an average of about 1 m (3 ft 3 in). A

fossorial A fossorial () animal is one adapted to digging which lives primarily, but not solely, underground. Some examples are badgers, naked mole-rats, clams, meerkats, and mole salamanders, as well as many beetles, wasps, and bees. Prehistoric eviden ...

species, the head is wedge-shaped and narrow with little neck delineation, which makes it easy to push through the soil. Its most defining characteristic is its

iridescent Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, feathers, butterfl ...

, highly polished scales that give this snake its common name. They have a layer of dark pigmentation just below the surface on each scale that enhances the iridescence. The youngs look very similar to the adults, except that they have a strong white "collar" of scales evident just below the head. This coloration fades within the first year. They have two cone opsins allowing for the potential of dichromatic

color vision Color vision, a feature of visual perception, is an ability to perceive differences between light composed of different wavelengths (i.e., different spectral power distributions) independently of light intensity. Color perception is a part of ...

.
This is a primitive form of snake with both boid and python characteristics; which family it belongs to is still a matter of debate.

Geographic range

Found in

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

( Guangdong and Yunnan),

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

, the

Andaman Andaman may refer to: * Andaman Islands * Andaman Sea * ''Andaman'' (1998 film), a Kannada-language film * ''Andaman'' (2016 film), a Tamil-language film * ''Andaman'' (2021 film), a Hindi-language film See also * Andaman and Nicobar Islands ...

and

Nicobar Islands The Nicobar Islands are an archipelagic island chain in the eastern Indian Ocean. They are located in Southeast Asia, northwest of Aceh on Sumatra, and separated from Thailand to the east by the Andaman Sea. Located southeast of the Indian s ...

, Vietnam,

Laos Laos (, ''Lāo'' )), officially the Lao People's Democratic Republic ( Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ, French: République démocratique populaire lao), is a socialist ...

, Cambodia, Thailand, West Malaysia, Penang Island, Singapore Island, East Malaysia ( Sarawak), Indonesia (the Riau Archipelago, Bangka, Billiton,

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

, We, Simalur, Nias, the Mentawai Islands /nowiki>Siberut">Siberut.html" ;"title="/nowiki>Siberut">/nowiki>Siberut/nowiki>, Borneo, Java and Sulawesi) and the Philippines (Balabac, Bongao, Jolo and Palawan). The Type locality (biology), type locality given is "Java".

Habitat

Tends to live in open areas such as forest clearings, gardens and parks. Often encountered in rice paddies.

Behavior

These snake are constrictors, killing their prey by suffocation in their muscular coils. They are

and spend most of their time below ground. They may bite readily if handled roughly, but mostly just try to escape if picked up. They are also observed to vibrate their tails in a rattlesnake-like fashion when they feel threatened.

Feeding

The diet is varied, consisting primarily of frogs, reptiles, including other snakes, and small mammals.

Reproduction

Oviparous Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, most reptiles, and all pterosaurs, dinosaurs (including birds), and ...

, with females laying up to 10 eggs at a time.

References

External links

*
Sunbeam Snake
a
Ecology Asia
Accessed 18 September 2008.

{{Taxonbar, from=Q1109192 Xenopeltidae Reptiles of the Philippines Taxa named by Caspar Georg Carl Reinwardt Reptiles described in 1827 Reptiles of Borneo