Kalmar "Genus Choloepus" tana nufin rabe-raben haraji a ilmin halitta wanda ya haɗa da nau'ikan dabbobi masu shayarwa guda biyu da ake samu a Tsakiyar Amurka da Kudancin Amirka waɗanda aka fi sani da sloths mai yatsu biyu. Kalmar "Genus" tana nufin wani nau'i na rarrabuwa a cikin tsarin harajin ilimin halitta, yayin da "Choloepus" shine sunan jinsin nau'in sloth mai ƙafa biyu. Dabbobi biyu da ke cikin wannan jinsin su ne Choloepus hoffmanni, wanda ake samu a Amurka ta tsakiya da ta Kudu, da Choloepus didactylus, wanda ake samu a Arewacin Amurka ta Kudu.