Late Oligocene - Middle Miocene

Priscileo is the smallest of all thylacoleonids, being only about the size of a possum or cuscus.  The genus Priscileo is currently represented by only one species, P. pitikantensis.

Priscileo pitakantensisThe oldest and most primitive member of the family Thylacoleonidae yet found.  It is known only from a rather poorly preserved fossil maxillary fragment and a few post-cranial bones recently found in the Late Oligocene Ngapakaldi Local Fauna at Lake Pitakanta in northeastern South Australia.

Late Miocene

Members of the genus Wakaleo were approximately the size of a dingo or other medium-sized dog.

Wakaleo alcootaensis -  This species comes from the Alcoota Local Fauna of the Northern Territory.  It was slightly larger in size than W. oldfieldi and W. vanderleueri (see below).  The sole representative fossil of this species (a fragmentary maxilla) was found in 1974 in the Miocene Waite Formation (Alcoota Local Fauna) by Dr. Michael Archer.

The maxillary fragment shown at right is the holotype (the single specimen designated by an author as the type of a species) of W. alcootaensis

W. oldfieldiIn 1971, a group of paleontologists, working in the Miocene Wipijiri Formation (Kutjamarpu Local Fauna, South Australia) discovered a nearly complete left dentary of this species which retained a number of rather well preserved teeth.  A small number of isolated teeth have also been recovered. 

Illustrated is the mandible described above.

W. vanderleueriThe first fossil material of this species (a right dentary fragment) was found in 1967 by a group of field workers from the Bureau of Mineral Resources working in the Miocene Camfield Beds of the Northern Territory (Bullock Creek local fauna).  Since then, quite a number of additional specimens have been found.  Among these is the magnificently preserved, nearly complete cranium with associated mandible shown in the photograph.
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