Reticulated python Temporal range: Pleistocene to recent | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Order: | Squamata |
Suborder: | Serpentes |
Family: | Pythonidae |
Genus: | Malayopython |
Species: | M. reticulatus |
Binomial name | |
Malayopython reticulatus | |
Synonyms | |
List
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The reticulated python (Malayopython reticulatus) is a python species native to South and Southeast Asia. It is the world's longest snake, and the third heaviest after the green anaconda and Burmese python. It is listed as least concern on the IUCN Red List because of its wide distribution. In several countries in its range, it is hunted for its skin, for use in traditional medicine, and for sale as pets. [1] Due to this, reticulated pythons are one of the most economically important reptiles worldwide. [6]
It is an excellent swimmer, has been reported far out at sea, and has colonized many small islands within its range.
Like all pythons, it is a non-venomous constrictor. In very rare cases, adult humans have been killed (and in at least six reported cases, eaten) by reticulated pythons. [7] [8] [9] [10]
The reticulated python was first described in 1801 by German naturalist Johann Gottlob Theaenus Schneider, who described two zoological specimens held by the Göttingen Museum in 1801 that differed slightly in colour and pattern as separate species—Boa reticulata and Boa rhombeata. [11] The specific name, reticulatus, is Latin meaning "net-like", or reticulated, and is a reference to the complex color pattern. [12] The generic name Python was proposed by French naturalist François Marie Daudin in 1803. [13] American zoologist Arnold G. Kluge performed a cladistics analysis on morphological characters and recovered the reticulated python lineage as sister to the genus Python, hence not requiring a new generic name in 1993. [14]
In a 2004 genetics study using cytochrome b DNA, Robin Lawson and colleagues discovered the reticulated python as sister to Australo-Papuan pythons, rather than Python molurus and relatives. [15] Raymond Hoser erected the genus Broghammerus for the reticulated python in 2004, naming it after German snake expert Stefan Broghammer, on the basis of dorsal patterns distinct from those of the genus Python, and a dark mid-dorsal line from the rear to the front of the head, and red or orange (rather than brown) iris colour. [16] In 2008, Lesley H. Rawlings and colleagues reanalysed Kluge's morphological data and combined it with genetic material, finding the reticulated clade to be an offshoot of the Australo-Papuan lineage as well. They adopted and redefined the genus name Broghammerus. [17]
Most taxonomists choose to ignore Broghammerus and other names by Hoser as its description lacked scientific rigour and was not published in a reputable journal. [18] R. Graham Reynolds and colleagues accordingly proposed the name Malayopython for this species and its sister species, the Timor python. [19] Malayopython has been recognized by subsequent authors [20] [21] and the Reptile Database. Hoser has argued that Broghammerus was validly published and Malayopython name is invalid as it is a junior synonym. [22] In 2021, the International Commission on Zoological Nomenclature found no basis for regarding the name Broghammerus to be invalid. [23] Nevertheless, the name Malayopython remains in use by reliable sources. [24]
Three subspecies have been proposed:
The latter two are dwarf subspecies. Apparently, the population of the Sangihe Islands north of Sulawesi represents another such subspecies, which is basal to the P. r. reticulatus plus P. r. jampeanus clade, but it is not yet formally described. [26]
The proposed subspecies M. r. "dalegibbonsi", M. r. "euanedwardsi", M. r. "haydnmacphiei", M. r. "neilsonnemani", M. r. "patrickcouperi", and M. r. "stuartbigmorei" [3] [16] have not found general acceptance.
The reticulated python has smooth dorsal scales that are arranged in 69–79 rows at midbody. Deep pits occur on four anterior upper labials, on two or three anterior lower labials, and on five or six posterior lower labials. [27]
The reticulated python is the largest snake native to Asia. More than a thousand wild reticulated pythons in southern Sumatra were studied, and estimated to have a length range of 1.5 to 6.5 m (4 ft 11 in to 21 ft 4 in), and a weight range of 1 to 75 kg (2 lb 3 oz to 165 lb 6 oz). [28] Reticulated pythons with lengths more than 6 m (19 ft 8 in) are rare, though according to the Guinness Book of World Records , it is the only extant snake to regularly exceed that length. [29] One of the largest scientifically measured specimens, from Balikpapan, East Kalimantan, Indonesia, was measured under anesthesia at 6.95 m (22 ft 10 in) and weighed 59 kg (130 lb 1 oz) after not having eaten for nearly 3 months. [30]
The specimen once widely accepted as the largest-ever "accurately" measured snake, that being Colossus, a specimen kept at the Highland Park Zoo (now the Pittsburgh Zoo and Aquarium) in Pittsburgh, Pennsylvania, during the 1950s and early 1960s, with a peak reported length of 8.7 metres (28 ft 7 in) from a measurement in November 1956, was later shown to have been substantially shorter than previously reported. When Colossus died on 14 April 1963, its body was deposited in the Carnegie Museum of Natural History. At that time, its skeleton was measured and found to be 20 ft 10 in (6.35 m) in total length, and the length of its fresh hide was measured as 23 ft 11 in (7.29 m). [31] The hide tends to stretch from the skinning process, thus may be longer than the snake from which it came – e.g., by roughly 20–40% or more. [32] The previous reports had been constructed by combining partial measurements with estimations to compensate for "kinks", since completely straightening an extremely large live python is virtually impossible. Because of these issues, a 2012 journal article concluded, "Colossus was neither the longest snake nor the heaviest snake ever maintained in captivity." Too large to be preserved with formaldehyde and then stored in alcohol, the specimen was instead prepared as a disarticulated skeleton. The hide was sent to a laboratory to be tanned, but it was either lost or destroyed, and now only the skull and selected vertebrae and ribs remain in the museum's collection. [31] Considerable confusion exists in the literature over whether Colossus was male or female (females tend to be larger). [31] [32] Numerous reports have been made of larger snakes, but since none of these was measured by a scientist nor any of the specimens deposited at a museum, they must be regarded as unproven and possibly erroneous. In spite of what has been, for many years, a standing offer of a large financial reward (initially $1,000, later raised to $5,000, then $15,000 in 1978 and $50,000 in 1980) for a live, healthy snake 30 ft (9.14 m) or longer by the New York Zoological Society (later renamed as the Wildlife Conservation Society), no attempt to claim this reward has ever been made. [32]
Date | Location | Reported length | Reported weight | Reported girth | Scientifically analyzed length | Comments |
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October, 1859 | Bayam Lepas, Philippines | 853.4 cm (336.0 in) | Not listed | 81.28 cm (32.00 in) | Not listed | Discovered eating a pig on the road to Telo Kumbar and killed [33] |
1912 | Celeb Island[ clarification needed ] | 998.2 cm (393.0 in) | Not listed | 30.48 cm (12.00 in) | Not listed | Reported to have been shot near a mining camp. Account given by explorer Henry C Raven. One photo was taken, but the body was not preserved. [33] [34] |
1931–1948 | Evansville, Indiana, United States | 1,023.62 cm (403.00 in) | 303.907 kg (670.00 lb) | Not listed | Not listed | Kept at Mesker Zoo between 1931 and 1948. Exceptional weight claim believed to be in error. [35] |
2011 | Kansas City, Missouri, United States | 767 cm (302 in) | 158.8 kg (350 lb) | Named "Medusa"; considered by the Guinness Book of World Records to be the longest (verified) living snake ever kept in captivity [36] |
The colour pattern is a complex geometric pattern that incorporates different colours. The back typically has a series of irregular diamond shapes flanked by smaller markings with light centers. In this species' wide geographic range, much variation of size, colour, and markings commonly occurs.
In zoo exhibits, the colour pattern may seem garish, but in a shadowy jungle environment amid fallen leaves and debris, it allows them to virtually disappear. Called disruptive colouration, it protects them from predators and helps them to catch their prey. [37]
The huge size and attractive pattern of this snake has made it a favorite zoo exhibit, with several individuals claimed to be above 20 ft (6.1 m) in length and more than one claimed to be the largest in captivity. [38] However, due to its huge size, immense strength, aggressive disposition, and the mobility of the skin relative to the body, it is very difficult to get exact length measurements of a living reticulated python, and weights are rarely indicative, as captive pythons are often obese. [32] Claims made by zoos and animal parks are sometimes exaggerated, such as the claimed 14.85 m (48 ft 9 in) snake in Indonesia which was subsequently proven to be about 6.5–7 m (21 ft 4 in – 23 ft 0 in) long. [39] For this reason, scientists do not accept the validity of length measurements unless performed on a dead or anesthetized snake that is later preserved in a museum collection or stored for scientific research. [32]
A reticulated python kept in the United States in Kansas City, Missouri, named "Medusa" is considered by the Guinness Book of World Records to be the longest living snake ever kept in captivity. In 2011 it was reported to measure 7.67 m (25 ft 2 in) and weigh 158.8 kg (350 lb 2 oz). [36]
In 2012, an albino reticulated python, named "Twinkie", housed in Fountain Valley, California, was considered to be the largest albino snake in captivity by the Guinness World Records. It measured 7 m (23 ft 0 in) in length and weighed about 168 kg (370 lb). [40]
Dwarf forms of reticulated pythons also occur, from some islands northwest of Australia, and these are being selectively bred in captivity to be much smaller, resulting in animals often referred to as "super dwarfs". Adult super dwarf reticulated pythons are typically between 1.82 and 2.4 m (6 ft 0 in and 7 ft 10 in) in length. [41]
The reticulated python is found in South and Southeast Asia from the Nicobar Islands, India, Bangladesh, Myanmar, Thailand, Laos, Cambodia, Vietnam, Malaysia, and Singapore, east through Indonesia and the Indo-Australian Archipelago (Sumatra, the Mentawai Islands, the Natuna Islands, Borneo, Sulawesi, Java, Lombok, Sumbawa, Sumba, Flores, Timor, Maluku, Tanimbar Islands) and the Philippines (Basilan, Bohol, Cebu, Leyte, Luzon, Mindanao, Mindoro, Negros, Palawan, Panay, Polillo, Samar, Tawi-Tawi). The original description does not include a type locality. The type locality was restricted to "Java" by Brongersma (1972). [2]
Three subspecies have been proposed, [26] but are not recognized in the Integrated Taxonomic Information System. The color and size can vary a great deal among the subspecies described. Geographical location is a good key to establishing the subspecies, as each one has a distinct geographical range.
The reticulated python lives in rainforests, woodlands, and nearby grasslands. It is also associated with rivers and is found in areas with nearby streams and lakes. An excellent swimmer, it has even been reported far out at sea and has consequently colonized many small islands within its range. [37] During the early years of the 20th century, it is said to have been common even in busy parts of Bangkok, sometimes eating domestic animals. [42]
As with all pythons, the reticulated python is an ambush predator, usually waiting until prey wanders within strike range before seizing it in its coils and killing by constriction. Its natural diet includes mammals and occasionally birds. Small specimens up to 3–4 m (9 ft 10 in – 13 ft 1 in) long eat mainly small mammals such as rats, other rodents, mouse-eared bats, and treeshrews, whereas larger individuals switch to prey such as small Indian civet and binturong, primates, pigs, and deer weighing more than 60 kg (132 lb 4 oz). [43] As a rule, the reticulated python seems able to swallow prey up to one-quarter its own length and up to its own weight. Near human habitation, it is known to snatch stray chickens, cats, and dogs on occasion. [28] Among the largest documented prey items are a half-starved sun bear of 23 kg (50 lb 11 oz) that was eaten by a 6.95 m (22 ft 10 in) specimen and took some 10 weeks to digest. [30] At least one case is reported of a foraging python entering a forest hut and taking a child. [44]
The reticulated python is oviparous. Adult females lay between 15 and 80 eggs per clutch. At an optimum incubation temperature of 31–32 °C (88–90 °F), the eggs take an average of 88 days to hatch. [25] Hatchlings are at least 0.61 m (2 ft) in length. [42]
The reticulated python is among the few snakes that prey on humans, and is the only species of snake where video and photographic proof exists of them having consumed humans. In 2015, the species was added to the Lacey Act of 1900, prohibiting import and interstate transport due to its "injurious" history with humans. [45] Attacks on humans in captivity are not common. Wild pythons, however, are known to sometimes prey on humans, particularly in their natural habitat in Sulawesi, Indonesia. Considering the known maximum prey size, a full-grown reticulated python can open its jaws wide enough to swallow a human, but the width of the shoulders of some adult Homo sapiens can pose a problem for even a snake with sufficient size. Reports of human fatalities and human consumption (the latest examples of consumption of an adult human being well authenticated) include:
Increased popularity of the reticulated python in the pet trade is due largely to increased efforts in captive breeding and selectively bred mutations such as the "albino" and "tiger" strains. Other notable color mutations recorded in this species include "sunfire", "motley", "Aztec", "ocelot", "rainbow", and "goldenchild". [64] Some mutations, such as the "BEL" (black eyed leucistic) mutations are seldom bred due the discovery that they develop fatal gastrointestinal issues upon reaching adulthood. [64] The "jaguar" color mutation is likewise controversial in the breeding of captive reticulated pythons, as certain specimens will develop neurological and osseous inner ears, similar to the "Spider" mutation that occurs in the ball python. It remains unclear as to why some individual pythons with the jaguar mutation display neurological issues associated with this genetic trait and others do not. [65]
Smaller animals such as the proposed "super dwarf" subspecies found on small islands are likewise popular due to their smaller size, as they grow to a fraction of the lengths and weights of their mainland kin due to genetics, limited space and prey availability. [66] Dwarf and super dwarf reticulated pythons are likewise defined for captive animals as any reticulated pythons with at least 50 percent lineage hailing from seven select islands in the Selayer island chain near Sulawesi. [67] It can make a good captive, but keepers working with adults from mainland populations should have previous experience with large constrictors to ensure safety to both animal and keeper. Although its interactivity and beauty draws much attention, some feel it is unpredictable. [68] [69] The python can bite and possibly constrict if it feels threatened, or mistakes a hand for food. While not venomous, large pythons can inflict serious injuries by biting, sometimes requiring stitches.
The Pythonidae, commonly known as pythons, are a family of nonvenomous snakes found in Africa, Asia, and Australia. Among its members are some of the largest snakes in the world. Ten genera and 39 species are currently recognized. Being naturally non-venomous, pythons must constrict their prey to induce cardiac arrest prior to consumption. Pythons will typically strike at and bite their prey of choice to gain hold of it; they then must use physical strength to constrict their prey, by coiling their muscular bodies around the animal, effectively suffocating it before swallowing whole. This is in stark contrast to venomous snakes such as the rattlesnake, for example, which delivers a swift, venomous bite but releases, waiting as the prey succumbs to envenomation before being consumed. Collectively, the pythons are well-documented and studied as constrictors, much like other non-venomous snakes, including the boas and even kingsnakes of the New World.
The Burmese python is one of the largest species of snakes. It is native to a large area of Southeast Asia and is listed as Vulnerable on the IUCN Red List. Until 2009, it was considered a subspecies of the Indian python, but is now recognized as a distinct species. It is an invasive species in Florida as a result of the pet trade.
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. Three species are recognized, each one with no subspecies. Studies of DNA suggest that the xenopeltids are most closely related to the Mexican burrowing python and to the true pythons (Pythonidae).
The green tree python, is a species of snake in the family Pythonidae. The species is native to New Guinea, some islands in Indonesia, and the Cape York Peninsula in Australia. First described by Hermann Schlegel in 1872, it was known for many years as Chondropython viridis. As its common name suggests, it is a bright green snake that can reach a total length of 2 m (6.6 ft) and a weight of 1.6 kg (3.5 lb), with females slightly larger and heavier than males. Living generally in trees, the green tree python mainly hunts and eats small reptiles and mammals. It is a popular pet, and numbers in the wild have suffered with large-scale smuggling of wild-caught green tree pythons in Indonesia. Despite this, the green tree python is rated as least concern on the IUCN Red List of endangered species.
Morelia spilota, commonly known as the carpet python, is a large snake of the family Pythonidae found in Australia, New Guinea, Bismarck Archipelago, and the northern Solomon Islands. Many subspecies are recognised; ITIS lists six, the Reptile Database six, and the IUCN eight.
The green anaconda, also known as the giant anaconda, emerald anaconda, common anaconda, common water boa, or southern green anaconda, is a semi-aquatic boa species found in South America and the Caribbean island of Trinidad. It is the largest, heaviest, and second longest snake in the world, after the reticulated python. No subspecies are currently recognized. Like all boas, it is a non-venomous constrictor. The term "anaconda" often refers to this species, though the term could also apply to other members of the genus Eunectes. Fossils of the snake date back to the Late Pleistocene in the Gruta do Urso locality.
The Indian python is a large python species native to tropical and subtropical regions of the Indian subcontinent and Southeast Asia. It is also known by the common names black-tailed python, Indian rock python, and Asian rock python. Although smaller than its close relative the Burmese python, it is still among the largest snakes in the world. It is generally lighter colored than the Burmese python and reaches usually 3 m. Like all pythons, it is nonvenomous.
Ptyas mucosa, commonly known as the Oriental rat snake, dhaman or Indian rat snake, is a common non-venomous species of colubrid snake found in parts of South and Southeast Asia. Dhamans are large snakes. Typical mature total length is around 1.5 to 1.95 m though some exceed 2 m. The record length for this species was 3.7 m, second only to their cousin Ptyas carinata among living colubrid snakes. Despite their large size, oriental ratsnakes are usually quite slender with even a specimen of 2 m commonly measuring 4 to 6 cm only around in diameter. Furthermore, the average weight of ratsnakes caught in Java was around 877 to 940 g, though larger males of over 2.3 m may easily weigh over 2.5 kg (5.5 lb). Their color varies from pale browns in dry regions to nearly black in moist forest areas. Rat snakes are diurnal, semi-arboreal, non-venomous, and fast-moving. Rat snakes eat a variety of prey and are frequently found in urban areas where rodents thrive.
The Central African rock python is a species of large constrictor snake in the family Pythonidae. The species is native to sub-Saharan Africa. It is one of 10 living species in the genus Python.
Insular dwarfism, a form of phyletic dwarfism, is the process and condition of large animals evolving or having a reduced body size when their population's range is limited to a small environment, primarily islands. This natural process is distinct from the intentional creation of dwarf breeds, called dwarfing. This process has occurred many times throughout evolutionary history, with examples including various species of dwarf elephants that evolved during the Pleistocene epoch, as well as more ancient examples, such as the dinosaurs Europasaurus and Magyarosaurus. This process, and other "island genetics" artifacts, can occur not only on islands, but also in other situations where an ecosystem is isolated from external resources and breeding. This can include caves, desert oases, isolated valleys and isolated mountains. Insular dwarfism is one aspect of the more general "island effect" or "Foster's rule", which posits that when mainland animals colonize islands, small species tend to evolve larger bodies, and large species tend to evolve smaller bodies. This is itself one aspect of island syndrome, which describes the differences in morphology, ecology, physiology and behaviour of insular species compared to their continental counterparts.
Morelia spilota spilota is a subspecies of carpet python, popularly known as the diamond python. It is a medium to large snake, found in coastal areas and adjacent ranges of south-eastern Australia. It is the most southerly occurring python in the world and is found at higher altitudes than any other species of Australian python.
The Timor python is a python species found in Southeast Asia. A dwarf species, no subspecies are recognized as being valid. Like all pythons, it is a nonvenomous constrictor; unlike larger species such as the reticulated python, it is not considered dangerous to humans.
The boa constrictor, also known as the common boa, is a species of large, non-venomous, heavy-bodied snake that is frequently kept and bred in captivity. The boa constrictor is a member of the family Boidae. The species is native to tropical South America. A staple of private collections and public displays, its color pattern is highly variable yet distinctive. Four subspecies are recognized.
Simalia tracyae, the Halmahera python, is a species of python found only on the Indonesian island of Halmahera. It belongs to the family Pythonidae and the genus Simalia. This snake was previously believed to have belonged to the Simalia amesthistina species; however, studies in recent years have caused scientists to distinguish between the two types of snakes, resulting in the reclassification of the Halmahera python as its own species.
Malayopython is a genus of constricting snakes in the family Pythonidae. The genus is native to India and Southeast Asia. It contains two species, both of which were previously classified within the genus Python. However, multiple studies recovered these species as distinct. Known as the "reticulatus clade", it was eventually found to be a sister lineage to a lineage giving rise to the Indo-Australian pythons rather than the genus Python.
D'Albertis' python, also known commonly as D'Albert's water python or the northern white-lipped python, is a species of python, a non-venomous snake in the family Pythonidae. The species is endemic to New Guinea. There are no subspecies that are recognized as being valid.
Akbar Salubiro was a 25-year-old man who went missing on March 25, 2017, after setting off for harvest in a remote village on the western part of the island Sulawesi, Indonesia. Akbar's remains were found two days later inside the body of a reticulated python.
The dwarf Burmese python is an insular dwarf subspecies of the Burmese python. The dwarf Burmese python is native to the Indonesian islands of Java, Bali, Sumbawa, and Sulawesi. The dwarf subspecies seems to have a maximum length of 5.9 ft (1.8 m). In 2009, the dwarf Burmese python was officially recognized as a subspecies of the Burmese python.