Wonambi is an extinct genus of madtsoiid snakes that lived in late Neogene to late Quaternary Australia. Species of Wonambi were constrictor snakes unrelated to Australian pythons.

Madtsoiidae is an extinct family of mostly Gondwanan snakes with a fossil record extending from early Cenomanian to late Pleistocene strata located in South America, Africa, India, Australia and South