Neidiopsis
Lange-Bertalot & Metzeltin 1999 Category: Symmetrical biraphid
TYPE SPECIES: Neidiopsis vekhovii (Lange-Bertalot & Genkal) Lange-Bertalot in Lange-Bertalot & Genkal
Image Credit: Ditmar Metzelin
CLASS: Bacillariophyceae
ORDER: Naviculales
FAMILY: Neidiaceae (?)
- Longitudinal lines present
- Proximal raphe ends straight or unilaterally deflected
- Distal raphe ends simply curved
- Striae may be uniseriate or biseriate
Valves are linear, linear-lanceolate, or linear-elliptic with variously protracted and obtusely rounded apices. A longitudinal, hyaline line runs from apex to apex along each side of the valve, interrupting the striae. Outer raphe branches are filiform. The proximal raphe ends are either straight or deflected to the same side. The proximal raphe ends are not expanded. Distal raphe ends are simply curved, rather than bifurcate. In some taxa, striae near the axial area are biseriate. The girdle is composed of a few perforated bands.
Neidiopsis contains the former Navicula levanderi Hustedt and its allies. Species within the genus are found in oligotrophic and low-conductivity lakes and ponds in northern and alpine regions. Representative species have been reported from the Northern Rocky Mountains, the Great Lakes, and the northeastern United States, as well as Arctic Canada, Greenland, and Siberia.
Neidiopsis differs from Neidium in the absence of longitudinal canals. Other features of Neidiopsis not shared by species of Neidium are simply curved (not bifurcate) terminal raphe fissures, unilaterally deflected proximal raphe ends and biseriate striae.
Cite This Page:
Bahls, L., and Metzeltin, D. (2012). Neidiopsis. In Diatoms of the United States. Retrieved May 25, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Neidiopsis
Contributor: Loren Bahls | Ditmar Metzeltin - January 2012
Reviewer: Sam Rushforth
Citations
Hustedt, F. (1930). Die Kieselalgen Deutschlands, Osterreichs und der Schweiz mit Berucksichtigung der ubrigen Lander Europas sowie der angrenzenden Meersgebiete. In: Dr. L. Rabenhorst's Kryptogamen-Flora von Deutschland, Osterreich und der Schweiz. Leipzig, Akademische Verlagsgesellschaft Geest und Portig K.-G. Vol. 7, Part 3, pp. 557-816.
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 Genkal, S.I. (1999). Diatoms from Siberia I. Islands in the Arctic Ocean (Yugorsky-Shar Strait). Iconographia Diatomologica 6: 1-292.
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
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
January 31st, 2012 - Genus description
January 17th, 2012 - Genus description The original Neidium page was posted in 2009 by Spaulding and Edlund, with Metzeltin added at a later date. Bahls clarified the diagnostic features and expanded on the genus description in the text for this website. There were no taxonomic or nomenclatural changes involved in the update. (S. Spaulding)