Anabaenopsis circularis

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

Anabaenopsis circularis (G.S.West) Wołoszyńska & Miller in Miller (1923: 125) Fig. 3 G–H .

Basionym: Anabaena flosaquae var. circularis G.S.West (1907: 170)

Filaments planktonic; trichomes solitary, arcuate or irregularly screw-like coiled, short, constricted at the cross walls. Vegetative cells cylindrical, 1.4–4 × longer than wide, with aerotopes, 4.5–10.5 μm long × (2.5–) 4–6 μm broad. Heterocytes spherical to oval, 3–7 μm in diameter. Akinetes solitary or in pairs, widely oval to oblong-ovate, with colourless or yellowish epispore, 8.0–12.0 μm long × 4.0–7.0 μm broad.

Specimens examined:—Ben Anderson Barrage, Bjelke-Petersen Dam, Boondooma Dam, Bucca Weir, Callide Dam, Coolmunda Dam, Dumbleton Weir, Eden Bann Weir, Jones Weir, Kirar Weir, Leslie Dam, Ned Churchward Weir, Neville Hewitt Weir, Paradise Dam, Tartrus Weir, Tinaroo Falls Dam.

Other records:— Western Australia: Hyde Park, Lee et al. (2014).

Observations:—Known mainly from tropical regions or warmer areas of the temperate zone. Differs from A. elenkinii by virtue of narrower vegetative cells.

Figures

FIGURE 3. A–F Anabaenopsis tanganyikae (ak = akinete); G–H Anabaenopsis circularis. Scale bars = 20 μm