The Ompax spatuloides was a hoax fish "discovered" in Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 in August, 1872. Said to be poisonous, it could be found on some lists of Australian fishes through the 1930s.

The fish was a joke perpetrated by people at Gayndah

Gayndah, Queensland

Gayndah is a town located on the Burnett River in Queensland, Australia. It is north of the state capital, Brisbane, and west of the regional city of Maryborough. The Burnett Highway passes through the town. At the 2006 census, Gayndah had a population of 1,745.-History:Exploration of the...

 station, Queensland

Queensland

Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...

, who prepared it from the body of a mullet

Mullet (fish)

The mullets or grey mullets are a family and order of ray-finned fish found worldwide in coastal temperate and tropical waters, and in some species in fresh water. Mullets have served as an important source of food in Mediterranean Europe since Roman times...

, the tail of an eel

Eel

Eels are an order of fish, which consists of four suborders, 20 families, 111 genera and approximately 800 species. Most eels are predators...

 and the head of a platypus

Platypus

The platypus is a semi-aquatic mammal endemic to eastern Australia, including Tasmania. Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young...

 or needlefish

Needlefish

Needlefish are piscivorous fishes primarily associated with very shallow marine habitats or the surface of the open sea. Some genera include species found in marine, brackish, and freshwater environments while a few genera are confined to freshwater rivers and streams, including Belonion,...

. They served it cooked for Carl Staiger, the director of the Brisbane

Brisbane

Brisbane is the capital and most populous city in the Australian state of Queensland and the third most populous city in Australia. Brisbane's metropolitan area has a population of over 2 million, and the South East Queensland urban conurbation, centred around Brisbane, encompasses a population of...

 Museum, and he forwarded a sketch and description of the fake to expert François Louis de la Porte, comte de Castelnau

François Louis de la Porte, comte de Castelnau

François Louis Nompar de Caumont LaPorte, comte de Castelnau was a French naturalist, known also as François Laporte or Francis de Castelnau.-Life:Born in London, he studied natural history in Paris...

, who described the supposed "species" in 1879.