Wakaleo oldfieldi is an enigmatic member of the family Thylacoleonidae (marsupial lions). It was smaller than the better known Pleistocene Thylacoleo carnifex. The holotype specimen was found in 1971 from the Leaf Locality at Lake Ngapakaldi in South Australia where it is part of the Kutjamarpu Local Fauna. It is also known from the Riversleigh World Heritage Area in north eastern Queensland.
Skeletal element: mandible (left)
Specimen number: SAMA P17925
Significance of specimen: Holotype
Geological age: Miocene
State/territory: South Australia
Locality/site: Leaf Locality, Lake Ngapakaldi