* Class "Melainabacteria"  ["Vampirovibrionia"; "Vampirovibrionophyceae" ] (ACD20)
** Order "Caenarcanales"  ["Caenarcaniphilales" ]
*** Family "Caenarcanaceae" 
**** Genus "Ca. Caenarcanum" 
***** "Ca. C. bioreactoricola" 
** Order "Obscuribacterales" 
*** Family "Obscuribacteraceae" 
**** Genus "Ca. Obscuribacter" 
***** "Ca. O. phosphatis" 
** Order "Vampirovibrionales" 
*** Family "Vampirovibrionaceae" 
**** Genus Vampirovibrio 
***** V. chlorellavorus 
** Order "Gastranaerophilales" 
*** Family CAJFVJ01
**** Genus "Ca. Adamsella" 
***** "Ca. A. avium" 
*** Family RUG14156
**** Genus "Ca. Galligastranaerophilus" 
***** "Ca. G. faecipullorum" 
***** "Ca. G. gallistercoris" 
***** "Ca. G. intestinavium" 
***** "Ca. G. intestinigallinarum" 
*** Family "Gastranaerophilaceae" 
**** Genus "Ca. Avigastranaerophilus" 
***** "Ca. A. faecigallinarum" 
**** Genus "Ca. Gastranaerophilus" 
***** "Ca. G. phascolarctosicola" 
***** "Ca. G. termiticola" 
**** Genus "Ca. Limenecus" 
***** "Ca. L. avicola" 
**** Genus "Ca. Scatenecus" 
***** "Ca. S. faecavius" 
**** Genus "Ca. Spyradomonas" 
***** "Ca. S. excrementavium" 
**** Genus "Ca. Stercorousia" 
***** "Ca. S. faecigallinarum" 
**** Genus "Ca. Scatousia" 
***** "Ca. S. excrementigallinarum" 
***** "Ca. S. excrementipullorum"