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The silky anteater, also known as the pygmy anteater, has traditionally been considered a single of , Cyclopes didactylus, in the Cyclopes, the only genus in the family . Found in southern , and and , it is the smallest of all known anteaters. It has habits and appears to be completely arboreal; its hind feet are highly modified for climbing.

A taxonomic review in 2017, including both molecular and morphological evidence, found that Cyclopes may actually comprise at least seven species. The only known cyclopedid species is , from the Late Miocene ( 7 to 9 million years ago) of modern-day .

(2025). 9780813031651, University Press of Florida.


Etymology
The scientific name Cyclopes didactylus translates to "two-toed circle-foot", referencing the two present on the forefeet. Additionally, the name alludes to the toes' ability to nearly encircle a branch while clinging.


Description
Silky anteaters are the smallest extant anteaters and have proportionately shorter faces and larger than other species. Average adult length ranges from , including a long, and weigh from . They have dense and soft , ranging from grey to yellowish in color, with a silvery sheen. Many subspecies have dark, often brownish, streaks and relatively paler underparts or limbs. Their eyes are black, while the foot soles are red.

The silky anteater possesses claws on the second and third toes of its forefeet, with the third toe being significantly larger. The fourth toe is small and clawless, while the remaining toes are or absent and not externally visible. On the hind feet, all four toes are of equal length and equipped with long claws, accompanied by a vestigial that is not externally visible. The are broad and flat, overlapping to form an internal armored casing that protects the chest.

The species also features partially , which further aid in their arboreal lifestyle.


Distribution and habitat
Silky anteaters are found from and southern in Mexico, through Central America (except ), and south to , and northern , , and . A distinct is found in the northern of eastern Brazil. Silky anteaters are also found on the of . They inhabit a range of different forest types, including , , and forests, from sea level to .


Systematics
Silky anteaters form the sister clade to the anteaters, together forming . Vermilingua is a sister clade to sloths (), together forming .

Until a detailed taxonomic review in 2017, seven of C. didactylus were recognized.

  • C. d. didactylus Linnaeus, 1758 - the , eastern , Trinidad, Atlantic Forest
  • C. d. catellus , 1928 - northern Bolivia, southeastern Peru, western Brazil
  • C. d. dorsalis Gray, 1865 - extreme southern Mexico, Central America, northern
  • C. d. eva Thomas, 1902 - western Ecuador, southwestern Colombia
  • C. d. ida, Thomas, 1900 - western Brazil, eastern Ecuador and Peru
  • C. d. melini Lönnberg, 1928 - northern Brazil, eastern Colombia
  • C. d. mexicanus , 1914 - southern Mexico

The 2017 review suggests that four of these subspecies deserve to be recognized as species, while the others are synonyms. It also described three new of silky anteater.

  • C. didactylus (, 1758) (synonym: C. d. melini) - the , eastern , Trinidad, Atlantic Forest and northern Brazil
  • C. catellus , 1928 - Bolivia
  • C. dorsalis (Gray, 1865) (synonyms: C. d. eva and C. d. mexicanus) - western Ecuador, southwestern to northern Colombia, Central America, southern Mexico
  • C. ida , 1900 - western Brazil, eastern Ecuador, eastern Colombia and Peru
  • C. thomasi Miranda et al., 2017 - Central Peru, extreme western Brazil (Acre)
  • C. rufus Miranda et al., 2017 - Brazil (Rondônia)
  • C. xinguensis Miranda et al., 2017 - Brazil, between the and the (Below the )


Behavior
Silky anteaters are and , found in lowland rainforests with continuous canopy, where they can move to different places without the need to descend from trees. They can occur at fairly high densities of 0.77 individuals/ha, for example, in some areas. Females have smaller home ranges than males.

The silky anteater is a slow-moving animal and feeds mainly on , eating between 700 and 5,000 a day. Silky anteaters also feed on wasps and wasp pupae, attacking the wasp nests at night when the wasps are sluggish and unable to defend themselves.

(1978). 9789004058194, Brill.
Sometimes, it also feeds on other insects, such as and small beetles. It has been observed to consume while in captivity. The silky anteater defecates once a day. Some of those faeces contain a large quantity of fragments of insects, indicating the silky anteater does not possess either or chitobiase, digestive enzymes found in bats.

It is a solitary animal and gives birth to a single young, up to twice a year. The young are born already furred, and with a similar colour pattern to the adults. They begin to take solid food when they are about one-third of the adult mass. The young is usually placed inside a nest of dead leaves built in tree holes, and left for about eight hours each night.

Some authors suggest the silky anteater usually dwells in ( ). Because of its resemblance to the seed pod fibers of these trees, it can use the trees as camouflage and avoid attacks of predators such as and, especially, . During the day, they typically sleep curled up in a ball. Although they are rarely seen in the forest, they can be found more easily when they are foraging on at night.

When threatened, the silky anteater, like other anteaters, defends itself by standing on its hind legs and holding its fore feet close to its face so it can strike any animal that tries to get close with its sharp claws.

The silky anteater is a host of the intestinal parasite Gigantorhynchus echinodiscus.


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