Hyriidae is a family of pearly freshwater mussels in the order Unionoida

Unionoida

Unionoida is an order of freshwater mussels, aquatic bivalve mollusks. The order includes most of the larger freshwater mussels, including the freshwater pearl mussels...

 native to South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, 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...

, New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

 and New Guinea

New Guinea

New Guinea is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago...

. Like all members of that order, they go through a larva

Larva

A larva is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle...

l stage that is parasitic on fish. The classification recognized by Banarescu (1990) uses three subfamilies. This family contains eighteen genera

Genera

Genera is a commercial operating system and development environment for Lisp machines developed by Symbolics. It is essentially a fork of an earlier operating system originating on the MIT AI Lab's Lisp machines which Symbolics had used in common with LMI and Texas Instruments...

.

Hyriinae

from South America

• Prisodon
• Paxyodon
• Triplodon
• Castalia
• Castalina
• Castaliella
• Callonaia
• Diplodon
  Diplodon
  Diplodon is a genus of freshwater pearly mussel, an aquatic bivalve in the Hyriidae family.The genus includes the following species:* Diplodon dunkerianus* Diplodon expansus* Diplodon fontaineanus* Diplodon granosus...
  
  
• Chevronaias

Velesunioninae

from Australasia

• Westralunio
  Westralunio
  Westralunio is a genus of bivalve in the Hyriidae family.It contains the following species:* Westralunio carteri...
  
  
• Velesunio
• Alathyria
• Microdonta
• Haasodonta
• Lortiella