Lakukullus is an extinct genus of nothrotheriid ground sloths that lived during the Middle Miocene around 13.8 to 11.8 million years ago of what is now Bolivia.

[1] The genus name, Lakukullus, is composed of "Laku’kullu", which means "wild animal of heights" in Aymara, a native Bolivian language, which refers to the locality the specimen was found.

The specific name is derived from the Latin word "anatisrostratum", which means "duck beak" in reference to the aspect of the snout appearing physically similar to the bill of an aquatic bird.

Their phylogenetically younger members possessed a dentition reduced by the anterior-most tooth per mandibular arch, diverging from other sloth groups.

According to the classical view, determined by skeletal anatomy investigations, the Megatherioidea can be considered one of the two major sloth lineages, the second being represented by the Mylodontoidea.