Large difference in chromosomes (number and characteristics) within Choloepus might mean there space even more than 2 varieties of two-toed slothsTwo-toed and also three-toed sloths were formerly placed in the same family but the two genera have profound behavioral and anatomical differences and also are thought to come indigenous two various fossil lineages. They are now put in separate families.2-toed is larger, faster, and also nocturnal. Diet is an ext varied - eats leaves and fruit. 6 or 7 neck vertebrae and also vestigial tail3-toed is smaller, slower and also both diurnal and nocturnal. Highly dedicated browsers - eat just leaves. 8 or 9 neck vertebrae. Stout tail is 68 mm (2.7 in ) longAll sloths have actually 3 claws on their hindlimbsSloths are an ext closely concerned anteaters than armadillos. Members of this group of pets have a reduced number of teeth.Anteaters space toothlessSloths have only 10 upper teeth and also 8 lower teethAnteaters and also sloths were as soon as grouped with each other as "Edentata" definition "without teeth".Common names because that the 2-toed sloths:Choloepus didactylus: southerly two-toed sloth, Linnaeus"s two-toed slothCholoepus hoffmanni: Hoffman"s two-toed slothLocal names: Prezoso de dos dedos is used in plenty of Spanish-speaking countries ("perezoso" means "lazy"). Preguica real or unau (in Brazil); perico ligero (in Columbia);cucala (in Honduras)

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extensive fossil record days from Eocene - more than 200 genera (Barros et al 2008) uncovered in South, Central, and North America, Caribbean and Antarctica. Size varied indigenous a tool dog to elephant. (Nowak 2008)Phylogenetic relationships space not resolved. Gaudin and McDonald postulate 4 families: Megalonychidae, Megatheriidae, Nothrotheriidae and also Mylodontidae. Bradypus is placed as a sister taxon come all other sloths. Choloepus is included into the Megalonychidae. At the very least three genera of large ground sloths resided in Southern California throughout the Pleistocene. A Shasta"s ground sloth skeleton was freshly excavated in Carlsbad (thought come be about 2.1 m (7 ft) long and weighing around 136 - 181 kg (300 - 400 lbs) — be affected by each other sized. First sloths arrived in phibìc America about 7 million years ago (presumably through swimming between islands from south America)By 13,000 years ago, every ground sloths were extinct except for a few populations top top Caribbean islands.

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia (Linnaeus, 1758)– mammals

Order: Pilosa (Flower, 1883) - a team of placental mammals uncovered in the Americas, consisting of anteaters and also sloths, and extinct soil sloths

Family: Megalonychidae (Ameghino, 1889)– two-toed sloths

Genus: Choloepus (Illiger, 1811) – two-toed sloths

Species: Choloepus didactylus(Linnaeus, 1758) – southerly two-toed sloth, Linnaeus"s two-toed sloth, Linné"s two-toed sloth Species: Choloepus hoffmanni (Peters, 1858) – Hoffmann"s two-toed sloth

Source: combined Taxonomic information System (2017)

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Illustration that a two-toed sloth indigenous a 1900 college textbook.

From Introduction to zoology; a guide to the research of animals, because that the use of second schools (1900); p.343.

Anderson and Hanley (2001) Barros et al. (2008)Gaudin and also McDonald (2008)Naish (2005)Wilson & Reeder (2005)