Neidium fogedii Bahls, 2013

Bahls, Loren, 2013, New diatoms (Bacillariophyta) from western North America, Phytotaxa 82 (1), pp. 7-28 : 18

Neidium fogedii Bahls , stat. nov., nom. nov. ( Figs 60–65 )

Replaced Synonym: — Neidium kozlowi var. densestriata Foged (1981: 135 , pl. XXV, fig. 11).

Holotype: —USA, Alaska: Brooks Range , Desperation Lake, freshwater, 68.3333 o N, 158.7500 o W, coll. C. Holmquist, 30 July 1969. Slide No. 13/1969, Foged Collection, Natural History Museum of Denmark (C), Copenhagen.

Vouchers: — USA, Colorado: Gunnison County, Mexican Cut Preserve, Upper Pond #56, 39.0247 o N, 107.0675 o W, elev. 3458 m, coll. M. Penton, 7 July 2012. MDC sample 494301; MDC slides 41-40 ( Figs 60- 65 ), 124-34. MONTU !

Etymology:—This species is named after Niels Foged. The new name is necessary because the name N. densestriatum is already occupied.

Observations:— Foged (1981) described valves of this taxon as 37 µm long by 9 µm wide with 18–20 striae in 10 µm. Specimens recently collected from a pond in Colorado ( Figs 60–65 ) are 33–55 µm long by 9.3–11.1 µm wide with 17–18 striae in 10 µm. Neidium fogedii has a higher stria density and narrower central area than Neidium inconstans ( Figs 52–55 ).

Distribution and Ecology: —To date this taxon has been collected only from the type locality and from a high elevation pond in Colorado. It appears to be a North American endemic. The type locality registered a pH of 7.3 and specific conductance of 27 µS/cm ( Foged 1981). The pond in Colorado had a pH of 7.2 and specific conductance of 102 µS/cm (M. Penton, unpublished data).

Figures

FIGURES 52–68: Neidium inconstans, Neidium bobmarshallensis, Neidium fogedii, Neidium undulatum. Figs 52–55: Neidium inconstans from Indian Springs Pond, Waterton Lakes National Park, Alberta. Figs 56–59: Neidium bobmarshallensis. Fig. 56: Logging Lake, Glacier National Park, Montana. Figs 57, 59: Dean lake, Bob Marshall Wilderness, Montana (type locality). Fig. 57: Holotype specimen. Fig. 58: Upper Trilobite Lake, Bob Marshall Wilderness, Montana. Figs 60–65: Neidium fogedii from Mexican Cut Upper Pond No. 56, Gunnison County, Colorado. Figs 66–68: Neidium undulatum from Grassy (Axolotl) Lake, Madison County, Montana. Scale bars: 10 µm.