A symbiotic eukaryote that lives in the hindgut of termites, Streblomastix is a protist associated with a community of ectosymbiotic bacteria.[1][2] 
 Motility
 Streblomastix moves by beating its anterior flagella. 
 Morphology
 These protists measure around 100 micrometers in length. They completely lack mitochondria.[3] 
 References
   - ^ Treitli, Sebastian C.; Kolisko, Martin; Husník, Filip; Keeling, Patrick J.; Hampl, Vladimír (2019-09-24). "Revealing the metabolic capacity of Streblomastix strix and its bacterial symbionts using single-cell metagenomics". Proceedings of the National Academy of Sciences. 116 (39): 19675–19684. Bibcode:2019PNAS..11619675T. doi:10.1073/pnas.1910793116. ISSN 0027-8424. PMC 6765251. PMID 31492817. 
  - ^ Treitli, Sebastian C.; Kotyk, Michael; Yubuki, Naoji; Jirounková, Eliška; Vlasáková, Jitka; Smejkalová, Pavla; Šípek, Petr; Čepička, Ivan; Hampl, Vladimír (November 2018). "Molecular and Morphological Diversity of the Oxymonad Genera Monocercomonoides and Blattamonas gen. nov". Protist. 169 (5): 744–783. doi:10.1016/j.protis.2018.06.005. PMID 30138782. 
  - ^ Novák, Lukáš V. F.; Treitli, Sebastian C.; Pyrih, Jan; Hałakuc, Paweł; Pipaliya, Shweta V.; Vacek, Vojtěch; Brzoň, Ondřej; Soukal, Petr; Eme, Laura; Dacks, Joel B.; Karnkowska, Anna; Eliáš, Marek; Hampl, Vladimír (2023-12-07). Dutcher, Susan K. (ed.). "Genomics of Preaxostyla Flagellates Illuminates the Path Towards the Loss of Mitochondria". PLOS Genetics. 19 (12): e1011050. doi:10.1371/journal.pgen.1011050. ISSN 1553-7404. PMC 10703272. PMID 38060519. 
  
    | 
|---|
 - Domain
  - Archaea
  - Bacteria
  - Eukaryota
  - (major groups
  - Metamonada
  - Discoba
  - Diaphoretickes 
- Hacrobia 
- Cryptista
 
   - Rhizaria
  - Alveolata
  - Stramenopiles
  - Plants
 
   - Amorphea 
- Amoebozoa
  - Opisthokonta 
- Animals
  - Fungi
  - Mesomycetozoea)
 
  
      | 
 | 
 | 
 |    | 
|---|
  |  - Chilomitus?
  - Rhizonympha?
  - Tricercomitus?
  - Trichocovina?
    | Hypotrichomonadea | | Hypotrichomonadida |  - Hypotrichomonadidae 
- Hypotrichomonas
  - Trichomitus
 
      | 
|---|
 
  | 
|---|
 | Pimpavickea |  | 
|---|
 | Trichomonadea | | Honigbergiellida |  - Hexamastigidae 
  - Honigbergiellidae 
- Honigbergiella
  - Ditrichomonoides
  - Honigbergiellopsis
  - Monotrichomonas
 
   - Cthulhuidae 
  - Tetratrichomastigidae 
     | 
|---|
 | Trichomonadida |  - Pseudotrichomonas?
  - Lacusteriidae 
  - Trichomonadidae 
- Trichomonas
  - Cochlosoma
  - Cyathosoma
  - Pentatrichomonas
  - Pentatrichomonoides
  - Pseudotrypanosoma
  - Ptychostoma
  - Tetratrichomonas
  - Trichomitopsis
  - Trichomonoides
 
      | 
|---|
 
  | 
|---|
 Clade "Tla"  | | Lophomonadea | | Lophomonadida |  - Lophomonadidae 
- Lophomonas
  - Eulophomonas
  - Prolophomonas
 
      | 
|---|
 
  | 
|---|
 | Trichonymphea | | Trichonymphida |  - Barbulanymphidae 
  - Hoplonymphidae 
  - Retractinymphidae 
  - Spirotrichosomidae 
- Spirotrichosoma
  - Apospironympha
  - Bispironympha
  - Colospironympha
  - Heliconympha
  - Leptospironympha
  - Macrospironympha
 
   - Staurojoeninidae 
  - Teranymphidae 
- Teranympha
  - Eucomonympha
  - Pseudotrichonympha
 
   - Trichonymphidae 
     | 
|---|
 
  | 
|---|
 
  | 
|---|
 
  |  Clade "Cadamassta"  | | Cristamonadea |  - Cyclojoenia?
  - Joenia?
  - Joenina?
  - Joenoides?
  - Joenopsis?
  - Pachyjoenia?
  - Parajoenopsis?
  - Placojoenia?
  - Projoenia?
    | Calonymphida |  - Calonymphidae 
- Calonympha
  - Criconympha
  - Daimonympha
  - Diplonympha
  - Gyronympha
  - Metastephanonympha
  - Prosnyderella
  - Snyderella
  - Stephanonympha
 
   - Deltotrichonymphidae 
  - Mixotrichidae 
     | 
|---|
 | Devescovinida |  - Devescovinidae 
- Devescovina
  - Achemon
  - Astronympha
  - Bullanympha
  - Caduceia
  - Coronympha
  - Evemonia
  - Foaina
  - Hyperdevescovina
  - Kirbynia
  - Kofoidia
  - Macrotrichomonas
  - Macrotrichomonoides
  - Metadevescovina
  - Parajoenia
  - Polymastigoides
  - Pseudodevescovina
  - Runanympha
 
      | 
|---|
 | Gigantomonadida |  | 
|---|
 
    | 
|---|
 | Dientamoebea |  | 
|---|
 | Monocercomonadea |  | 
|---|
 | Simplicimonadea |  | 
|---|
 | Tritrichomonadea |  | 
|---|
 | Spirotrichonymphea | | Cononymphida |  | 
|---|
 | Holomastigotoidida |  | 
|---|
 | Spirotrichonymphida |  - Brugerollinidae 
- Brugerollina
  - Pseudospironympha
 
   - Fraterculidae 
  - Holomastigotidae 
- Holomastigotes
  - Spiromastigotes
  - Spirotrichonymphella
  - Uteronympha
 
   - Spirotrichonymphidae 
- Spirotrichonympha
  - Microjoenia
  - Micromastigotes
  - Nanospironympha
  - Spironympha
  - Torquenympha
 
      | 
|---|
 
  | 
|---|
 
  | 
|---|
 
  |  
    | 
|---|
 
  | 
 | 
  Taxon identifiers  | 
|---|
| Streblomastix |  | 
|---|