title: Olenidae
text: # Olenidae
  
  Olenidae is a family of ptychopariid trilobites. Some genera, Balnibarbi and Cloacaspis, are thought to have evolved a symbiotic relationship with sulfur-eating bacteria from which they derived nutrition.
  
  ## Genera
  
  * Acerocare
  * Acerocarina
  * Aciculolenus
  * Anaximander
  * Angelina =Keidelaspis),
  * Apoplanias
  * Asilluchus
  * Baikonuraspis
  * Balnibarbi
  * Bienvillia (=Diatemnus; =Mendoparabolina)
  * Boeckaspis (/Boeckia BROGGER; =Sphaerophthalmella)
  * Bondarevites
  * Bulbolenus
  * Chekiangaspis
  * Cloacaspis
  * Ctenopyge
  * Cyclognathina
  * Danarcus
  * Desmetia
  * Eoctenopyge
  * Euonchonotina
  * Eurycare
  * Granitzia
  * Hancrania
  * Helieranella
  * Highgatella
  * Huangshiaspis
  * Hunanolenus
  * Hypermecaspis (=Spitsbergaspis),
  * Inkouia (=Agalatus),
  * Isidrella
  * Jujuyaspis (=Alimbetaspis),
  * Leiobienvillia
  * Leptoplastides (=Andesaspis;=Beltella; =Chunkingaspis; =Parabolinopsis; *Rampartaspis),
  * Leptoplastus
  * Leurostega
  * Magnomma
  * Mesoctenopyge
  * Moxomia
  * Neoolenus
  * Neoparabolina
  * Nericiaspis
  * Olenus (=Simulolenus),
  * Orkekeia
  * Parabolina (/*Odontopyge),
  * Parabolinella
  * Parabolinina
  * Parabolinites
  * Paraolenus
  * Paraplicatolina
  * Peltocare
  * Peltura (/Anthes; =Anopocare),
  * Pelturina
  * Plicatolina
  * Plicatolinella
  * Porterfieldia
  * Prohedinella
  * Protopeltura
  * Psilocara
  * Remizites
  * Rhodonaspis
  * Saltaspis
  * Shihuigouia
  * Sphaerophthalmus
  * Svalbardites
  * Talbotinella
  * Triarthrus (/*Brongniartia EATON)?
  * Ullaspis
  * Westergaardia (=Sphaerophthalmoides)
  * Westergaardites
  * Wujiajiania.
  