Pangolin

Pangolin Temporal range: Paleocene–present PreЄ Є O S D C P T J K Pg N
Sunda pangolin (Manis javanica)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
(unranked):	Ferae
Order:	Pholidota Weber, 1904
Family:	Manidae Gray, 1821
Genera
Manis Phataginus Smutsia

Pangolins (also referred to as scaly anteaters or trenggiling) are mammals of the order Pholidota. The one extant family, Manidae, has three genera: Manis which comprises four species living in Asia, Phataginus which comprises two species living in Africa, and Smutsia which comprises two species also living in Africa.^[1] These species range in size from 30 to 100 centimetres (12 to 39 in). A number of extinct pangolin species are also known. The name pangolin comes from the Malay word "pengguling", meaning "something that rolls up". It is found in tropical regions throughout Africa and Asia.

Pangolins have large, protective keratin scales covering their skin; they are the only known mammals with this adaptation. They live in hollow trees or burrows, depending on the species. Pangolins are nocturnal, and their diet consists of mainly ants and termites which they capture using their long, specially adapted tongues. They tend to be solitary animals, meeting only to mate and produce a litter of one to three offspring which are raised for about two years. Pangolins are threatened by hunting (for their meat and armor) and heavy deforestation of their natural habitats, and are the most trafficked mammal in the world.^[2] Of the eight species of pangolin, four species (Phataginus tetradactyla, P. tricuspis, Smutsia gigantea, and S. temminckii) are listed as vulnerable, 2 species (Manis crassicaudata and M. cullonensis) are listed as endangered, and 2 species (M. pentadctyla and M. javanica) are listed as critically endangered on the IUCN Red List of Threatened Species.^[3]

Description

The physical appearance of a pangolin is marked by large, hardened, overlapping plate-like scales. The scales, which are soft on newborn pangolins but harden as the animal matures, are made of keratin, the same material of which human fingernails and tetrapod claws are made. The pangolin's scaled body is comparable to a pine cone or globe artichoke. It can curl up into a ball when threatened, with its overlapping scales acting as armour and its face tucked under its tail. The scales are sharp, providing extra defense. The front claws are so long they are unsuited for walking, so the animal walks with its fore paws curled over to protect them.

Pangolins can also emit a noxious-smelling chemical from glands near the anus, similar to the spray of a skunk.^[4] They have short legs, with sharp claws which they use for burrowing into termite and ant mounds, as well as climbing.^[5]

The size of pangolins varies by species, ranging from 30 to 100 centimetres (12 to 39 in). Females are generally smaller than males.

The tongues of pangolins are extremely elongated and extend into the abdominal cavity. By convergent evolution, pangolins, the giant anteater, and the tube-lipped nectar bat all have tongues that are not attached to their hyoid bone and extend past their pharynx deep into the thorax.^[6] This extension lies between the sternum and the trachea. Large pangolins can extend their tongues as much as 40 centimetres (16 in), with a diameter of only 0.5 centimetres (0.20 in).^[7]

Behavior

Most pangolins are nocturnal animals that use their well-developed sense of smell to find insects. The long-tailed pangolin is also active by day, while other species of pangolins spend most of the daytime sleeping, curled up into a ball.^[7]

Arboreal pangolins live in hollow trees, whereas the ground dwelling species dig tunnels underground, to a depth of 3.5 metres (11 ft).^[7] Pangolins are also good swimmers.^[7]

Diet

Indian pangolin defending itself against Asiatic lions

Pangolins are insectivorous. Most of their diet consists of various species of ants and termites and may be supplemented by other insects, especially larvae. They are somewhat particular and tend to consume only one or two species of insects, even when many species are available to them. A pangolin will consume an average of 140 to 200 g (4.9 to 7.1 oz) of insects per day.^[8]

Pangolins have a very poor sense of vision, and therefore rely heavily on smell and hearing. After locating their prey, they tear open the anthills or termite mounds with their powerful front claws. Their front claws are so large that their front feet are not useful for walking. The animal uses its long tail to counterbalance its torso as it walks on its two hind legs. After tearing open the ant or termite mound, it uses its long tongue to probe inside the insect tunnels and retrieve its prey. They have glands in their chests to lubricate the tongue with sticky, ant-catching saliva. The tongue extends all the way into a cavity of the abdomen and is longer than the pangolin's entire body length. Pangolins lack teeth and, therefore, the ability to chew, however, they ingest small stones while foraging, which accumulate in the muscular stomach and help to grind up ants.

Some species, such as the tree pangolin, use their strong, prehensile tails to hang from tree branches and strip away bark from the trunk, exposing insect nests inside.

Reproduction

Pangolins are solitary and meet only to mate. Males are larger than females, weighing up to 50% more. While there is no defined mating season, they typically mate once each year, usually during the summer or autumn months. Rather than the males seeking out the females, males mark their location with urine or feces and the females will find them. If there is competition over a female, the males will use their tails as clubs to fight for the opportunity to mate with her.^[9]

Gestation lasts for approximately 120–150 days. African pangolin females usually give birth to a single offspring at a time, but the Asiatic species may give birth from one to three.^[7] Weight at birth is 80 to 450 g (2.8 to 15.9 oz) and the average length is 150 millimetres (5.9 in). At the time of birth, the scales are soft and white. After several days, they harden and darken to resemble those of an adult pangolin. During the vulnerable stage, the mother stays with her offspring in the burrow, nursing it, and will wrap her body around it if she senses danger. The young cling to the mother's tail as she moves about, although in burrowing species, they remain in the burrow for the first two to four weeks of life. At one month, they first leave the burrow riding on the mother's back. Weaning takes place at approximately three months of age, at which stage the young begin to eat insects in addition to nursing. At two years of age, the offspring are sexually mature and are abandoned by the mother.^[10]

Threats

A coat of armor made of pangolin scales, an unusual object, was presented to George III in 1820

Pangolins are hunted and eaten in many parts of Africa and are one of the more popular types of bush meat. They are also in great demand in Southern China and Vietnam because their meat is considered a delicacy and some believe pangolin scales have medicinal qualities.^{[11][12][13][14]} This, coupled with deforestation, has led to a large decrease in the numbers of giant pangolins. In November 2010, pangolins were added to the Zoological Society of London's list of genetically distinct and endangered mammals.^[15] All eight species of pangolin are classified by the IUCN as threatened to extinction, while two are classified as critically endangered.^[12][16]

Though pangolin are protected by an international ban on their trade, populations have suffered from illegal trafficking due to unfounded beliefs in East Asia that their ground-up scales can stimulate lactation or cure cancer or asthma.^[17] In the past decade there have been numerous seizures of illegally trafficked pangolin and pangolin meat in Asia.^{[18][19][20][21]} In one such incident during 2013, 10,000 kilograms of pangolin meat was seized from a Chinese vessel that ran aground in the Philippines.^[22][23]

Conservation

As a result of increasing threats to pangolins, mainly in the form of illegal, international trade in pangolin skin, scales, and meat, these species have received increasing conservation attention in recent years. For example, in 2014, the IUCN (International Union for the Conservation of Nature) re-categorised all eight species of pangolin on its Red List of Threatened Species, and each species is now threatened with extinction.^[24] Also, the IUCN SSC Pangolin Specialist Group launched a global action plan to conserve pangolins, dubbed 'Scaling up Pangolin Conservation' in July 2014.

Taxonomy

Tree pangolin

Chinese pangolin

Pangolins were formerly classified with various other orders, for example Xenarthra, which includes the ordinary anteaters, sloths, and the similar-looking armadillos. Newer genetic evidence, however, indicates their closest living relatives are the Carnivora with which they form the clade Ferae.^[25][26] Some palaeontologists placed Ernanodonta in a separate suborder of Cimolesta near Pholidota,^[27] have classified the pangolins in the order Cimolesta, together with several extinct groups indicated (†) below, though this idea has fallen out of favor since cimolestids have been determined to have not been placental mammals.^[28]

Until recently, all species of pangolin had been attributed to the genus Manis. Recent research has supported the splitting of pangolins into three genera: Manis, Phataginus, and Smutsia.^[1]

• ORDER PHOLIDOTA^[29][30]
  • Genus †Arcticanodon dawsonae Rose, Eberle & McKenna 2004
  • Genus †Melaniella timosa Fox 1984
  • Genus †Molaetherium Heissig 1982
  • Family †Escavadodontidae Rose & Lucas 2000
    • Genus †Escavadodon zygus Rose & Lucas 2000
  • Family †Epoicotheriidae Simpson 1927
    • Genus †Amelotabes simpsoni Rose 1978
    • Genus †Alocodontulum atopum (Rose, Bown & Simons 1977) Rose, Bown & Simons 1978 [Alocodon Rose, Bown & Simons 1977 non Thulborn 1973; Alocodon atopum Rose, Bown & Simons 1977; Tubulodon atopum (Rose, Bown & Simons 1977) Rose et al. 1991]
    • Genus †Auroratherium sinense Tong & Wamg 1997
    • Genus †Pentapassalus Gazin 1952
      • Species †P. pearcei Gazin 1952 [Tubulodon pearcei (Gazin 1952) Rose et al. 1991]
      • Species †P. woodi (Guthrie 1967) Rose 1978 [Palaeanodon woodi Guthrie 1967; Tubulodon woodi (Guthrie 1967) Rose et al. 1991]
    • Genus †Dipassalus oryctes Rose, Krishtalka & Stucky 1991
    • Genus †Tetrapassalus Simpson 1959a
      • Species †T. mckennai Simpson 1959a
      • Species †T. proius West 1973c
    • Genus †Epoicotherium unicum (Douglass 1904) Simpson 1927 [Xenotherium Douglass 1906 non Ameghino 1904; Pseudochrysochloris Turnbull & Reed 1967; Xenotherium unicum Douglass 1905; Pseudochrysochloris yoderensis Turnbull & Reed 1967]
    • Genus †Tubulodon taylori Jepsen 1932
    • Genus †Xenocranium pileorivale Colbert 1942
  • Family †Metacheiromyidae Wortman 1903
    • Genus †Propalaeanodon schaffi Rose 1979
    • Genus †Palaeanodon Matthew 1918
      • Species †P. parvulus Matthew 1918
      • Species †P. ignavus Matthew 1918
      • Species †P. nievelti Gingerich 1989
    • Genus †Brachianodon westorum Gunnell & Gingerich 1993
    • Genus †Mylanodon rosei Secord et al. 2002
    • Genus †Metacheiromys Wortman 1903
      • Species †M. marshi Wortman 1903 [Metacheiromys tatusia Osborn 1904]
      • Species †M. dasypus Osborn 1904 [Metacheiromys osborni Simpson 1931]
  • Genus †Argyromanis patagonica Ameghino 1904
  • Genus †Orthoarthrus mixtus Ameghino 1904
  • Genus †Euromanis krebsi (Storch & Martin 1994) Gaudin, Emry & Wible 2009 [Eomanis krebsi Storch and Martin 1994]
  • Suborder Eupholidota Gaudin, Emry & Wible 2009
    • Family †Eomanidae Storch 2003
      • Genus †Eomanis waldi Storch 1978
    • Family Patriomanidae Szalay & Schrenk 1998 sensu Gaudin, Emry & Pogue 2006
      • Genus †Cryptomanis gobiensis Gaudin, Emry & Pogue 2006
      • Genus †Patriomanis americana Emry 1970
    • Family Manidae Gray 1821
      • Genus †Necromanis Filhol 1893 [Leptomanis Filhol 1893; Necrodasypus Filhol 1893; Teutomanis Ameghino 1905; Galliaetatus Ameghino 1905]
        • Species †N. franconica (Quenstedt 1886) [Lutra franconica Quenstedt 1886]
        • Species †N. parva Koenigswald 1969
        • Species †N. quercyi Filhol 1893
        • Species †N. galliae
      • Subfamily Smutsiinae Gray 1873 (African pangolins)
        • Genus Phataginus Rafinesque 1821 ^[1] [Phataginus Rafinesque 1815 (nomen nudum); Triglochinopholis Fitzinger 1872; Uromanis Pocock 1924]
          • Tree pangolin (P. tricuspis (Rafinesque 1821) Rafinesque 1821)
          • Long-tailed pangolin (P. tetradactyla (Linnaeus 1766))
        • Genus Smutsia Gray 1865 ^[1] (African ground pangolins)
          • Giant pangolin (S. gigantea (Illiger 1815))
          • Ground pangolin (S. temmincki (Smuts 1832))
      • Subfamily Maninae Gray 1821
        • Genus Manis Linnaeus 1758 [Pholidotus Storr 1780; Quaggelo Frisch 1775; Pangolinus Rafinesque 1821; Pangolinus Rafinesque 1815 nomen nudum; Pangolin Gray 1873; Phatages Sundevall 1843] (Asiatic pangolins)
          • †M. hungarica Kormos 1934
          • †M. lydekkeri Trouessart
          • Asian giant pangolin (M. paleojavanica Dubois) †
          • Subgenus (Manis) Linnaeus 1758
            • Indian pangolin (M. crassicaudata Gray 1827)
            • Chinese pangolin (M. pentadactyla Linnaeus 1758)
          • Subgenus (Paramanis) Pocock 1924
            • Sunda pangolin (M. javanica Desmarest 1822)
            • Philippine pangolin (M. culionensis Elera 1915)

References

External links

Wikimedia Commons has media related to Pholidota.

Wikispecies has information related to: Pholidota

Look up pangolin in Wiktionary, the free dictionary.

• Pangolin: Wildlife summary from the African Wildlife Foundation
• Tree of Life of Pholidota
• National Geographic video of a pangolin
• Proceedings of the Workshop on Trade and Conservation of Pangolins Native to South and Southeast Asia (PDF)
•  Oldfield Thomas; Richard Lydekker (1911). "Pangolin". Encyclopædia Britannica (11th ed.). 
• The Phylogeny of Living and Extinct Pangolins (Mammalia, Pholidota) and Associated Taxa: A Morphology Based Analysis (PDF)