使用者:Lureplant/沙盒

磨齒獸亞科 化石時期：Middle Miocene to Early Holocene (Hemphillian-Rancholabrean (NALMA) & Colloncuran-Lujanian (SALMA) ~
Skeleton of Glossotherium robustum at the Natural History Museum, London
科學分類
界：	動物界 Animalia
門：	脊索動物門 Chordata
綱：	哺乳綱 Mammalia
目：	披毛目 Pilosa
科：	†磨齒獸科 Mylodontidae
亞科：	†磨齒獸亞科 Mylodontinae Gill, 1872
亞群
†始祖磨齒獸屬 Archaeomylodon †布列瓦懶屬 Brievabradys? †Glossotheriopsis †巨懶屬 Megabradys †Mylodonopsis †Ocnotherium †奧利奧磨齒獸屬 Oreomylodon? †原掠齒懶獸屬 Prolestodon †原磨齒獸屬 Promylodon †Ranculcus †Strabosodon †掠齒懶獸族 Lestodontini †Bolivartherium †Lestobradys †掠齒懶獸屬 Lestodon †Magdalenabradys †Sphenotherus †Thinobadistes †磨齒獸族 Mylodontini †Glossotheridium †舌懶獸屬 Glossotherium †Kiyumylodon †磨齒獸屬 Mylodon †副磨齒獸屬 Paramylodon †Pleurolestodon †Simomylodon

Mylodontinae is an extinct subfamily of ground sloths that lived from the Early Miocene to the Early Holocene epochs.

Classification

The classification of the Mylodontidae is complex and often under discussion. The most widely accepted subfamilies are the Mylodontinae with Mylodon as the type genus and the Lestodontinae, whose type genus is Lestodon, which sometimes also includes Paramylodon and Glossotherium (sometimes also listed as belonging to the tribes Mylodontini and Lestodontini. The subdivision of the terminal group of mylodonts into the Lestodontinae and Mylodontinae found confirmation in one of the most comprehensive studies of the phylogeny of sloths based on cranial features in 2004, which subsequently found multiple support. However, a later analysis from 2019 cast doubt on it again. A higher-resolution phylogenetic study of the mylodonts published in the same year again supports the branching of terminal forms. According to this, the Mylodontinae and Lestodontinae can be distinguished on the basis of the canine anterior teeth. In the latter, these are large and separated from the posterior teeth by a long diastema; the former, on the other hand, have only small or partially reduced caniniform teeth, which are usually more closely apposed to the molar-like teeth. Numerous other subfamilies have been established in the past, including, for example, the Nematheriinae for representatives from the Lower Miocene or the Octomylodontinae for all basal forms. Their recognition varies mostly depending on the author. Another subfamily, the Urumacotheriinae, were established only in 2004. Their basal position consists of the late Miocene representatives of northern South America. In principle, a revision for the entire family is urged, since many of the higher taxonomic units lack a formal diagnosis.

Below is a phylogenetic tree of the Mylodontinae, based on the work of Boscaini and colleagues (2019).

磨齒獸科

Pseudoprepotherium      烏魯馬科懶屬 Urumacotherium            八齒懶屬 Octodontotherium      Paroctodontotherium          布列瓦懶屬 Brievabradys    磨齒獸亞科   掠齒懶獸族       Bolivartherium      掠齒懶獸屬 Lestodon          Thinobadistes        Lestobradys      Sphenotherus       Lestodontini  磨齒獸族     Pleurolestodon          Glossotheridium      Simomylodon          舌懶獸屬 Glossotherium        副磨齒獸屬 Paramylodon        Kiyumylodon      磨齒獸屬 Mylodon           Mylodontini Mylodontinae

Mylodontidae