Stauroforma
Flower, Jones & Round 1996 Category: Araphid
TYPE SPECIES: Stauroforma exiguiformis (Lange-Bertalot) Flower, Jones & Round
CLASS: Fragilariophyceae
ORDER: Fragilariales
FAMILY: Fragilariaceae
- Valves lack rimoportulae
- Striae meet in central valve face
- Central area absent
Frustules of Stauroforma are small, with an elliptic to lanceolate valve outline. The valves not centrally expanded. Rimoportulae are absent in species of Stauroforma. The striae are continuous across the valve face, although this feature may be difficult to resolve in the light microscope. Frustules are linked together into linear colonies. Spines may be present or absent.
Stauroforma is composed of species formerly considered within Fragilaria virescens. Stauroforma lacks rimoportulae, which distinguishes it from Fragilariforma.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Stauroforma. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Stauroforma
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Citations
Flower, R.J., Jones, V.J. and Round, F.E. (1996). The distribution and classification of problematic Fragilaria (virescens v.) exigua Grun./Fragilaria exiguiformis (Grun.) Lange-Bertalot: a new species or a new genus?. Diatom Research 11: 41-57.