New diatoms (Bacillariophyta) from western North America Author Bahls, Loren text Phytotaxa 2013 2013-02-22 82 1 7 28 http://dx.doi.org/10.11646/phytotaxa.82.1.2 journal article 10.11646/phytotaxa.82.1.2 1179-3163 5071599 Cymbopleura edlundii Bahls , sp. nov. ( Figs 21–26 ) Valves lanceolate with rounded subrostrate apices, distinctly dorsiventral in small specimens, slightly dorsiventral in larger specimens. Valve length 51–87 µm ; valve width 14.3–17.9 µm . Axial and central areas very wide, 1/3 to 1/2 valve width, together forming a lanceolate space with a tumid center somewhat offset towards the ventral margin. Raphe distinctly lateral, becoming weakly reverse-lateral near proximal and distal ends. Proximal raphe ends offset to the ventral side, tipped with distinctly expanded pores. Distal raphe ends hooked towards the dorsal side. Striae radiate throughout, 9–13 in 10 µm at valve center, 14–16 in 10 µm near the apices. Areolae 25–30 in 10 µm . Holotype :— USA , Montana : Flathead County , Glacier National Park , Starvation Ridge Pond , 48.9739 o N , 114.3247 o W , elev. 1500 m , coll. E. W. Schweiger , 17 July 2008 . MDC sample 438501; holotype slide MDC 121-84 ( Figs 21–26 ) (circled holotype specimen in Fig. 24 ). MONTU ! Isotypes: —MDC slide 39-67 ( MONTU !); ANSP GC 65018. Etymology :—This species is named in honor of Mark Edlund, distinguished diatomist and respected colleague. Observations :— Cymbopleura edlundii may be distinguished from similar Cymbopleura species , including C. rainierensis (this paper, Figs 27–33 ), by its very wide axial and central areas. FIGURES 21–33: Cymbopleura edlundii , Cymbopleura rainierensis . Figs 21–26: Cymbopleura edlundii from Starvation Ridge Pond, Glacier National Park, Montana (type locality). Fig. 24: Holotype specimen. Figs 27–33: Cymbopleura rainierensis . Fig. 27: Surprise Lake, King County, Washington. Figs 28, 29, 32: Frog Pond above Dewey Lake, Mount Rainier National Park, Washington. Figs 30, 31: Paradise Pond, Glacier National Park, Montana. Fig. 33: No Name Hanging Fen, Glacier National Park, MT. Scale bars: 10 µm. Distribution and Ecology: — Cymbopleura edlundii is known only from the type locality, a small pond near the Montana border with British Columbia , Canada . Water quality data for this pond are not available, but based on other waters in the area it is presumed to have circumneutral pH and low levels of nutrients and dissolved solids.