Table 8 Comparative morphology of selected freshwater Frontonia species
| Characters | F. leucas sensu Foissner |
F. leucas Italy, Neotype | F. leucas India | F. leucas Turkey | F. paramagna China | F. paramagna India | F. angusta Neotype | F. angusta Turkey |
|---|---|---|---|---|---|---|---|---|
| Average body length (μm) | 250 | 180 | 173 | 335 | 341 | 293 | 116 | 170 |
| Cytostome/body length ratio | 1/5–1/8 | 1/7 | 1/6 | 1/8–1/9 | 1/10 | 1/10 | 1/5 | 1/4 |
| Somatic kineties, number | 115 | 104 | 100 | 187 | 180–200 | 166–208 | 94 | 105 |
| Peniculi (I, II, III), number | 4–5, 4–5, 4–5 | 5, 5, 5 | 5, 5, 5 | 4–5, 4–5, 4–5 | 4, 4, 4 | 4, 4, 4 | 5–4, 3, 2 | 4–5, 4–5, 4–5 |
| Vestibular kineties, number | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 3 |
| Postoral kineties, number | 6 | 5–6 | 6 | 6–8 | 6–7 | 6–7 | 4 | 4–6 |
| Micronuclei, number | 2–9 | 2–3 | 2–4 | 1 | 8a | 6–14 | 1 | 1 |
| Micronuclei, size (μm) | ND | 3–5 | 1.5–2 | 7–8a | ND | 1.5–2.3 | 7a | 5–8 |
| CVC, number | ~ 10 | 8–11 | 7–8 | 10–12 | ~ 15 | 10–14 | Absent | Absent |
| CVC, structure | Long, twisted | Long, twisted | Long, twisted | Branched | Long, straight | Long, straight | Absent | Absent |
| PCV, number | 1 | 1 | 1 | 1 | 1 | 1–3 | 2–4 | 1 |
| References | [3, 4] | Present study | Present study | [25] | [15, 46] | Present study | [7] | [25] |