The Priapium fishes are a family, Phallostethidae, of atheriniform

Atheriniformes

Atheriniformes, also known as the silversides, is an order of ray-finned fish that includes the Old World silversides and several less-familiar families, including the unusual Phallostethidae...

 fish native to South-east Asia.

They are small fish, no more than 3.5 centimetres (1.4 in) in length, with partially translucent bodies. They are found in fresh and brackish water from Thailand to the Philippines. They are named for a muscular organ found under the tail of males. This organ, which may possess small testicles, is used together with the pelvic fins to grasp the female during mating. Unlike most other fish, priapum fishes exhibit internal fertilisation.

Classification

There are 21 species of priapium fish, grouped into four genera:

Family Phallostethidae

• Genus: Gulaphallus
  • Gulaphallus bikolanus
  • Gulaphallus eximius
  • Gulaphallus falcifer
  • Gulaphallus mirabilis
  • Gulaphallus panayensis
• Genus: Neostethus
  • Neostethus amaricola
  • Neostethus bicornis
  • Neostethus borneensis
  • Neostethus ctenophorus
  • Neostethus djajaorum
  • Neostethus lankesteri
  • Neostethus palawanensis
  • Neostethus robertsi
  • Neostethus thessa
  • Neostethus villadolidi
  • Neostethus zamboangae
• Genus: Phallostethus
  Phallostethus
  Phallostethus is a genus of fish in the Phallostethidae family.It contains the following species:* Phallostethus dunckeri...
  
  
  • Phallostethus dunckeri
    Phallostethus dunckeri
    Phallostethus dunckeri is a species of fish in the Phallostethidae family. It is endemic to Malaysia.-References:* Kottelat, M. 1996. . Downloaded on 4 August 2007....
    
    
  • Phallostethus lehi
• Genus: Phenacostethus
  • Phenacostethus posthon
  • Phenacostethus smithi