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Table 1 Diacritical morphological characteristics of four Aphanizomenon taxa reviewed from natural samples collected in the Nakdong River

From: Morphology and taxonomy of the Aphanizomenon spp. (Cyanophyceae) and related species in the Nakdong River, South Korea

Species Fascicles trichomes Terminal cells Vegetative cells Heterocytes Akinetes
Aphanizomenon flos-aquae Band-like, up to 2 cm long, straight or bent, often grouped in fascicles Elongated cylindrical, not narrowed, without aerotopes, almost hyaline Cylindrical to slightly barrel-shaped, 4.0–12.1 × 3.6–5.6 μma (n = 45) Intercalary, solitary, cylindrical, 6.6–8.5 × 3.3–3.9 μma (n = 19) Intercalary, long cylindrical, distant from heterocytes, 30–62 × 5.2–7.5 μma (n = 22)
Aphanizomenon klebahnii Spindle-like, up to 3 mm long, straight or slightly arcuated, often grouped in fascicles Elongated cylindrical, without aerotopes, and with remaining cytoplasm in the form of fine granulation Cylindrical or slightly barrel-shaped, 3.9–8.3 × 3.6–4.9 μma (n = 31) Solitary, intercalary, oval to cylindrical, 5.5–6.7 × 3.2–4.0 μma (n = 6) Intercalary, solitary, elongated cylindrical, 26–39 × 4.5–5.9 μma (n = 17)
Aphanizomenon skujae Solitary, straight, bent or irregularly curved Narrowed and elongated, bluntly pointed, containing a smaller amount of pigment and sporadic aerotopes 4.8–8.4 × 1.2–2.5 μma (n = 19) Solitary, intercalary, oval to cylindrical, 6–15 × 2–3 μmb Solitary or up to 3 in a row, cylindrical with rounded ends, wider than trichomes, 7.6–11.8 × 3.8–4.6 μma (n = 13)
Cuspidothrix issatschenkoi Solitary, straight, bent, or slightly coiled Tapered like hair-shaped, almost hyaline, continually pointed Cylindrical to long-cylindrical, usually with scarce aerotopes, 4.4–7.0 × 2.5–3.3 μma (n = 36) Solitary, intercalary, 6.6–8.7 × 3.4–3.7 μma (n = 5) Solitary or 2–3 in a row, distant from heterocytes, long cylindrical with rounded ends, 8.5–12.5 × 4–4.6 μmc
  1. n number of identified samples
  2. aThis study
  3. bKomárek 2013
  4. cRajaniemi et al. 2005b