Raphidiopsis curvata Fritsch & Rich (1929: 91)

Mcgregor, Glenn B., 2018, Freshwater Cyanobacteria of North-Eastern Australia: 3. Nostocales, Phytotaxa 359 (1), pp. 448-450 : 448-450

Raphidiopsis curvata Fritsch & Rich (1929: 91) Fig. 20 G .

Filaments planktonic; trichomes solitary or rarely in small floccose clusters, c-shaped curved, sigmoidally coiled or irregularly circular, not constricted at the cross walls. Vegetative cells cylindrical, 1.5–2.5 × longer than broad, 2–4.5 μm broad, blue-green, with aerotopes. Apical cells elongated and sharply pointed. Akinetes intercalary, barrel-shaped or bluntly cylindrical oval, sometimes slightly curved, single or multiple in series, 10–16 μm long × 3.5–5.5 μm broad, with smooth, colourless epispore.

Specimens examined:—Lake Clarendon, Eungella Dam, Wuruma Dam.

Other records:— Queensland: SE Queensland, McLeod (1975).

Observations:—Cosmopolitan. Uncommon species, rarely reported from reservoirs and weir pools. Differs from R. mediterranea by the curved shape of the trichome.

Figures

FIGURE 20. A–F Raphidiopsis mediterranea; G Raphidiopsis curvata. Scale bars = 20 μm