title: Diplotriaenidae
text: # Diplotriaenidae
  
  Diplotriaenidae is a family of spirurian nematodes. Like all their relatives, they have neither a circulatory a or respiratory system. They are the only family in superfamily Diplotriaenoidea, if the Oswaldofilariidae are correctly placed with the Filarioidea and not here.
  
  ## Systematics
  
  Subfamilies and genera of Diplotriaenidae are:
  
  Subfamily Diplotriaeninae
  
  * Quadriplotriaena
  * Diplotriaena - includes Diplotriaenoides
  * Chabaudiella
  
  Subfamily Dicheilonematinae
  
  * Monopetalonema - includes Politospiculum and Ornithosetaria
  * Petrovifilaria
  * Dicheilonema - includes Contortospiculum
  * Hastospiculum - includes Setarospiculum
  * Hamatospiculum - includes Parhamatospiculum, Tytofilaria, Oceanifilaria
  * Serratospiculum
  * Heterospiculum - includes Heterospiculoides
  * Serratospiculoides
  