Odontidium rupestris (Y.Liu & Quanxi Wang) Jüttner & D.M.Williams 2017

Jüttner, I., Williams, D. M., Gurung, S., Vijver, B. Van De, Levkov, Z., Sharma, C. M., Sharma, S. & Cox, E. J., 2017, The genus Odontidium (Bacillariophyta) in the Himalaya-a preliminary account of some taxa and their distribution, Phytotaxa 332 (1), pp. 1-21 : 12

Odontidium rupestris (Y.Liu & Quanxi Wang) Jüttner & D.M.Williams , comb. nov. (2010: 338, figs 1 – 17, Figs 79 –

93)

Basionym: Diatoma rupestris Y. Liu & Quanxi Wang in Y. Liu, C. Fu, Q. Wang & E.F. Stoermer (2010: 338, figs 1 – 17)

Type: CHINA: Stone pond, Aer Mountain in Great Xing’an Mountains, attached to filamentous algae (Slide 043107, Shanghai Normal University, Shanghai, China, holotype)

LM ( Figs 79–93 ): Large valves linear, tapering to cuneate apices; smaller valves linear-lanceolate with slightly protracted, rostrate apices. Valve dimensions (n=10): length 15.5 – 55.5 μm, width 5.5 – 7.0 (8.0). Most transapical ribs primary, perpendicular or at an angle to sternum, 3 – 5 in 10 μm. Sternum diffuse, narrow, striae between ribs parallel or at an angle to sternum.

Ecology and distribution: — Odontidium rupestris was found in three streams across the Himalaya in Nepal. It was very rare in a stream in the Jumla district of western Nepal, an alpine stream situated at 3350 m a.s.l. (NMW. C.2007.006.S5). In the Helambu area it was found in a fast flowing stream situated at 4381 m a.s.l., 3.5 m wide, with cobble and pebble substratum (NMW.C.2007.006.He07). In eastern Nepal, in the Gokyo Valley of the Everest National Park, it occurred in a small alpine stream flowing into the lake Dudh Pokhari at its western shore (NMW. C.2009.003.51, G3 inlet north face sand).

Figures

FIGURES 79–93. Odontidium rupestris. LM. Valve views. Figs 79–87: NMW.C.2007.006.He07: stream south of the Laurebina Pass, Helambu, Nepal. Figs 88–93: NMW.C.2009.003.51: inflow of Dudh Pokhari, Everest National Park, Scale bar = 10 μm.