Cavinula
Mann and Stickle in Round, Crawford and Mann 1990 Category: Symmetrical biraphid
TYPE SPECIES: Cavinula cocconeiformis Mann and Stickle in Round, Crawford and Mann
Image Credit: Eduardo Morales, Ditmar Metzeltin
CLASS: Bacillariophyceae
ORDER: Naviculales
FAMILY: Cavinulaceae
- Valves linear-lanceolate to nearly circular
- Striae uniseriate, radial
Species of Cavinula are characterized by uniseriate, radial striae composed of round to elongate areolae. Valves are linear-lanceolate to nearly circular in outline. Internally, the central sternum is thickened, a feature visible in SEM. Externally, the proximal raphe is expanded, while the internal proximal raphe ends are straight. One or two chloroplasts are present in living cells, which are H-shaped in girdle view.
This genus is known from oligotrophic lakes and moist subaerial habitats across the United States. It includes the former Navicula cocconeiformis Gregory and its allies. The uniseriate, radial striae and the terminal raphe ends curve to opposite sides of the valve are just two characters that distinguish it from Navicula sensu stricto.
Cite This Page:
Spaulding, S., Edlund, M., Morales, E., and Metzeltin, D. (2009). Cavinula. In Diatoms of the United States. Retrieved June 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Cavinula
Contributor: Sarah Spaulding | Mark Edlund | Eduardo Morales | Ditmar Metzeltin - January 2009
Citations
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.
Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms. Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.