Genus-level Identification |
Genera |
Spironucleus |
Hexamita |
Octomitus |
Flagellar pockets (cytostomal canals)a |
+ |
+ |
- |
Central axis formed by recurrent axonemes, microtubular bands, endoplasmic reticulum |
- |
- |
+ |
Two terminal spikes |
- |
- |
+ |
Shape of nuclei |
S-shaped |
Spherical |
Reniform |
Location of kinetosomes relative to nuclei |
Sub-apical |
External structure |
Between |
Position of recurrent flagella relative to nuclei |
Medial |
Lateral |
Medial |
Supra-nuclear microtubular band |
+ |
+ |
Reduced |
Infra-nuclear microtubular band |
+ |
+ |
Reduced |
Species-level Identification |
Species |
S. barkhanus /S. salmonicida |
S. salmonis |
S. torosa |
S. vortens |
Flagellar pocket ornamentation |
Crescent-shaped (barkhan) |
No ornamentation |
Ring-shaped swellings (torus) |
Counter-crossing ridges |
Microtubular pattern around flagellar pocket |
3 radiate bands |
- |
3 concentric bands |
3 staggard bands |
Distinctive organelles |
- |
Electron-dense bodies / membrane-bound sac of free ribosomes |
- |
Hydrogenosomesb |