Anabaenopsis elenkinii Miller (1923: 125)

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

Anabaenopsis elenkinii Miller (1923: 125) Fig. 4 A–D.

Filaments planktonic; trichomes solitary, shortly circinate to irregularly screw-like coiled, coils 15–35 (–50) μm in diameter, constricted at the cross walls. Vegetative cells barrel-shaped to long ellipsoid, isodiametric to 1.2–4 × longer than wide, with aerotopes, 4.0–7.5 (–9) μm long × 4–6 (–8) μm broad. Heterocytes spherical to slightly ovate, 3–7 (–10) μm in diameter. Akinetes solitary or in series, ovate to oblong-ovate, with colourless or yellowish epispore, 8.0–15.0 μm long × (5.5–) 8.0–11.0 μm broad.

Specimens examined:—Warrego R. at Allan Tannock Weir, Atkinson Dam, Beardmore Dam, Fitzroy R. at Bingegang Weir, Fitzroy R. at Moura Weir, Fitzroy R. at Bedford Weir, Fitzroy R. at Giru Weir, Fitzroy R. at Glebe Weir, Fitzroy R. at Tartrus Weir, Fitzroy R. at Theodore Weir, Fitzroy R. at Eden Bann Weir, Fitzroy R. at Neville Hewitt Weir, Burnett R. at Claude Wharton Weir, Burnett R. at Ben Anderson Barrage, Burnett R. at Kirar Weir, Burnett R. at Ned Churchward Weir, Burnett R. at Jones Weir, Bill Gunn Dam, Bjelke-Petersen Dam, Boondooma Dam, Bowen R. at Bowen R. Weir, Kolan R. at Bucca Weir, Burdekin Falls Dam, Callide Dam, Cania Dam, Condamine R. at Chinchilla Weir, Coolmunda Dam, Pioneer R. at Mirani Weir, Pioneer R. at Marian Weir, Pioneer R. at Dumbleton Weir, East Leichhardt Dam, Eungella Dam, Fairbairn Dam, Fred Haigh Dam, Gattonvalue offstream storage, Glenlyon Dam, Condamine R. at Jack Taylor Weir, Julius Dam, Kinchant Dam, Lake Clarendon, Maroon Dam, Mary R. at Mary R. Barrage, Moogerah Dam, Moura offstream storage, Paradise Dam, Peter Faust Dam, Tinaroo Falls Dam, Wuruma Dam.

Other records:— South Australia: Bundaleer Res., Howards Dam, Kangaroo Is., Kimba Farm Dam, Eyre Penin., Strathalbyn Res., Kersbrook and Mount Barker farm dams, Mount Lofty Ranges , Pinnaroo and Frances farm dams ; New South Wales: Namoi R. near Walgett ; Victoria: Edenhope Res., Kerang and Shepparton farm dams, Baker (1991) ; Western Australia: Swan Coastal Plain Wetlands, Kemp (2009) ; Northern Territory: Ling & Tyler (2000).

Observations:—Widespread species throughout the warmer areas of the temperate zone, common in the plankton of mesotrophic reservoirs and weir pools throughout Australia; not typically a bloom forming species. Compare with A. circularis which typically has narrower vegetative cells.