Neidium fogedii

Bahls 2013      Category: Symmetrical biraphid
BASIONYM: Neidium kozlowi var. densestriata Foged 1981

REPORTED AS: Neidium kozlowi var. densestriata (Antoniades et al. 2008, p.201, plate 124, figs. 6-7, 9) 

Neidium bobmarshallensis

 

Neidium undulatum

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - April 2013
Length Range: 33-55 µm
Width Range: 9.3-11.1 µm
Striae in 10 µm: 17-18

Description

Valves are lanceolate to linear-lanceolate, with subrostrate to subcapitate apices. A longitudinal line is evident along each margin. The axial area is narrow and widens near to the central area. The central area is wide, rectangular and asymmetric, oriented diagonally to the apical axis. Short striae are present at the margins of the central area. The raphe is lateral, becoming filiform near the proximal ends. The proximal raphe ends are hooked and recurved in opposite directions. Striae are oriented diagonally to the apical axis throughout. Areolae number 26-28 in 10 µm.



Original Description

Basionym: Neidium kozlowi var. densestriata
Author: Foged 1981
Length Range: 37 µm
Width Range: 9 µm
Striae in 10 µm: 18-20

Original Description

Valvis multo minoribus et striis densioribus a varietate nominata differt. Differs from the nominate variety by having much smaller valves and denser striae.

Original Images


Cite This Page:
Bahls, L. (2013). Neidium fogedii. In Diatoms of the United States. Retrieved September 19, 2014, from http://westerndiatoms.colorado.edu/taxa/species/neidium_fogedii

Species: Neidium fogedii

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Antoniades, D., Hamilton, P.B., Douglas, M.S.V. and Smol, J.P. (2008). Diatoms of North America: The freshwater floras of Prince Petrcik, Ellef Ringnes and northern Ellesmere Islands from the Canadian Arctic Archipelago. Iconographia Diatomologica 17.

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

Foged, N. (1981). Diatoms in Alaska. Bibliotheca Phycologica, Band 53, J. Cramer, Vaduz, 317 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Neidium fogedii CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Neidium fogedii is known only from the type locality and from Upper Pond #56 at the Mexican Cut Nature Preserve in Gunnison County, Colorado. On the date the Colorado sample was collected, water temperature was 12.3 C, pH measured 7.20 and specific conductance measured 102 µS/cm. Both Foged (1981) and Antoniades et al. (2008) report this taxon (as N. kozlowi var. densestriata) from Desperation Lake in the Brooks Range, Alaska, where pH varied between 8.1 and 8.5 and conductivity ranged from 151 to 707 (Antoniades et al. 2008).

Images

One of many high elevation ponds at the Mexican Cut Nature Preserve in Gunnison County, Colorado: home of Neidium fogedii.

Credit/Source: Nature Conservancy