Geissleria
Lange-Bertalot et Metzeltin 1996 Category: Symmetrical biraphid
TYPE SPECIES: Geissleria moseri Metzeltin Witkowski et Lange-Bertalot in Lange-Bertalot et Metzeltin
Image Credit: Marina Potapova
CLASS: Bacillariophyceae
ORDER: Naviculales
FAMILY:
- Annulae present at poles
- Isolated punctum present or absent in the central area
- Valve elliptical or linear-elliptical with rounded or rostrate ends
Geissleria valves are elliptical to linear-elliptical, becoming obtuse, broadly rounded or rostrate at the ends. The striae are comprised of fine lineolate areolae; aerolae 50-80 in 10 µm. Distinctive annulae are present at the poles. The annulae are comprised of one to four transapical striae that interrupt the typical striae. The raphe is straight and filiform, with straight proximal ends. Terminal raphe ends are deflected. An isolated punctum may be present or absent in the central area.
Geissleria includes species that were formerly included in the 'Annulatae' section of Navicula, including Navicula paludosa (Hustedt) andN. similis Krasske. Geissleria species are broadly distributed over a range of oliogotrophic to eutrophic waters, but are locally rare in abundance. Species level ecological preferences may be more specific.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Geissleria. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Geissleria
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Cantonati, M. and Lange-Bertalot, H. (2006). Geissleria gereckei sp. nov. (Bacillariophyta) from leaf-litter covered stones of very shaded carbonate mountain springs with extremely low discharge. Phycological Research 57:171-177.
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. 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.
Metzeltin, D. (1996). Geissleria lange-bertalotii sp. nov. Iconographia Diatomologica 4: 234-245.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Potapova, M. and Winter, D. (2006). Use of nonparametric multiplicative regression for modeling diatom habitat: a case study of three Geissleria species from North America. In: Advances in Phycological Studies (N. Ognjanova-Rumenov and K. Manyolov, eds). Pensoft Publishers, Sofia-Moscow pp. 319-332.