Neidiopsis hamiltonii

Bahls 2014      Category: Symmetrical biraphid
BASIONYM: Neidiopsis hamiltonii Bahls 2014

REPORTED AS: Neidiopsis levanderi? (Lange-Bertalot 2001, fig. 101: 16) | Neidiopsis levanderi (Lange-Bertalot and Metzeltin 1996, fig. 29: 6) 

Neidiomorpha binodiformis

 

Neidiopsis levanderi

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - November 2015
Length Range: 20-44 µm
Width Range: 6.0-8.3 µm
Striae in 10 µm: 22-24

Description

Valves are linear–lanceolate in large specimens, to elliptic–lanceolate in small specimens. Apices are broadly rounded and subcapitate in the largest specimens. The axial area is narrow and widens gradually toward the valve center where it merges with a small, rhomboidal central area. The raphe is filiform, with weakly expanded proximal ends. Proximal raphe ends are straight and relatively close to one another. The distal raphe fissures are curved toward the same side of the valve. Striae are weakly radiate at the valve center, becoming parallel toward the apices. Areola density within a stria is 20–26 in 10 μm. A prominent longitudinal line interrupts the striae on each side of the valve about midway between the raphe sternum and the valve margin, closer to the valve margin near the apices. Less prominent longitudinal lines are also evident.



Original Description

Basionym: Neidiopsis hamiltonii
Author: Bahls 2014
Length Range: 19.5-43.6 µm
Width Range: 6.0-8.3 µm
Striae in 10 µm: 22-24

Original Description

Valves are linear–lanceolate in large specimens to elliptic–lanceolate in small specimens. Valve length 19.5–43.6μm, valve width 6.0–8.3μm. Apices are broadly rounded, rostrate to subcapitate in the largest specimens, subrostrate and weakly protracted in small specimens. The axial area is narrow and widens gradually towards the valve center where it merges with a rhomboidal central area. The raphe is filiform with weakly expanded proximal ends. Proximal raphe ends are straight and relatively close together. Distal raphe fissures are curved toward the same side of the valve. Striae are weakly radiate at the valve center, becoming parallel toward the apices. Stria density 22–24 in 10μm; areola density within a stria 20–26 in 10μm. A prominent longitudinal line interrupts the striae on each side of the valve about midway between the raphe sternum and the valve margin, coming closer to the valve margin near the apices. Less prominent longitudinal lines are also evident. Plastids were not observed.

Original Images


Cite This Page:
Bahls, L. (2015). Neidiopsis hamiltonii. In Diatoms of the United States. Retrieved October 22, 2017, from http://westerndiatoms.colorado.edu/taxa/species/neidiopsis_hamiltonii

Species: Neidiopsis hamiltonii

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Bahls, L.L. (2014). Neidiopsis hamiltonii sp. nov., N. weilandii sp. nov., N. levanderi and N. wulffii from western North America. Diatom Research. 10.1080/0269249X.2014.889606

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Neidiopsis hamiltonii has been recorded from two ponds in Colorado (3450 m a.s.l.) and from Hoskins Lake in northwest Montana (1036 m a.s.l.). The pH measured at these locations was 7.6 and specific conductance ranged from 40 to 67 μS cm−1. A single specimen of N. hamiltonii was also reported [as Neidiopsis levanderi?] from the ‘Rocky Mountains, Canada’ (Lange-Bertalot and Metzeltin 1996, Fig. 29: 6; Lange-Bertalot 2001, Fig. 101: 16).

Images

Mexican Cut Nature Preserve, Gunnison County, Colorado: Type locality of Neidiopsis hamiltonii.

Credit/Source: Nature Conservancy