Navicymbula
Krammer 2003 Category: Asymmetrical biraphid
TYPE SPECIES: Navicymbula pusilla Krammer
Image Credit: Marina Potapova
CLASS: Bacillariophyceae
ORDER:
FAMILY:
- Asymmetry to apical axis slight
- Distal raphe ends dorsally deflected
- Striae lineate
The valve outline is very slightly asymmetric to the apical axis, valves are nearly naviculoid in appearance. The raphe is positioned in a nearly central position on valve. The distal raphe ends are deflected dorsally. Striae are lineate. Valves lack apical pore fields.
The genus is more closely allied with Navicula than Cymbella. Navicymbula pusilla, one of the brackish to saline taxa, is found in endorheic lakes of the Northern Great Plains.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Navicymbula. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Navicymbula
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Citations
Kociolek, J.P. and Stoermer, E.F. (1988). A preliminary investigation of the phylogenetic relationships among the freshwater, apical porefield-bearing cymbelloid and gomphonemoid diatoms (Bacillariophyceae). Journal of Phycology 24: 377-385. 10.1111/j.1529-8817.1988.tb04480.x
Krammer, K. (1982). Valve morphology and taxonomy in the genus Cymbella C.A. Agardh. Morphology of Diatom Valves 11: 1-299.
Krammer, K. (1997). Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part., Encyonopsis and Cymbellopsis. Bibliotheca Diatomologica 37:1-469.
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.