Cylindrospermopsis helicoidea Cronberg & Komárek (2003: 83

Li, Xiao-Chuang, Huo, Shou-Liang, Cai, Fang-Fang, Yang, Yi-Ming, Xi, Bei-Dou & Li, Ren-Hui, 2017, The taxonomy and phylogeny of the genus Cylindrospermopsis (Cyanobacterium) evaluated by adding five new records from China, Phytotaxa 316 (3), pp. 224-238 : 228

Cylindrospermopsis helicoidea Cronberg & Komárek (2003: 83 , 95, fig. 15)

Strains:— CHAB 357 from Lake Wenshan in Shenzhen City, Guangdong Province.

Habitat:— In lakes, planktonic.

Description:— Trichomes solitary, free floating, intensely screw-like coiled, with mainly 3–6 coils, without mucilaginous envelopes ( Fig. 1D–G ). Cells cylindrical, not constricted at cross walls, not or slightly attenuated towards the ends, 5.3–6.7–8.9 μm long, 2.0–2.5–3.2 μm wide (L:W ratio 1.9–2.7–3.5), apical cells are rounded at the ends. Heterocytes ellipsoidal to irregularly barrel-shaped, slightly curved, narrowed and rounded at the apex, their long axis are oriented parallel with the axis of the coiled filament, 4.6–6.4–8.2 μm long, 2.6–4.1–5.7 μm wide (L:W ratio 1.2–1.6–2.3). Akinetes not found ( Table S4).

Notes:— C. helicoidea was featured with densely coiled trichomes.

Figures

FIGURE 1. General morphological aspects of five Cylindrospermopsis new records species from China. A–C. C. taverae CHAB 143. D–G. C. helicoidea CHAB 357. H–K. C. philippinensis CHAB 5180. L. C. philippinensis CHAB 5182. M. C. catemaco CHAB 148. N–O. C. catemaco CHAB 151. P. C. catemaco CHAB 155. Q. C. catemaco CHAB 220. R. C. africana CHAB 359. S. C. africana CHAB 485. T–V. C. africana CHAB 1394. Scale bars = 10 μm. Note: C. = Cylindrospermopsis.