Bruder and Medlin 2008 Category: Symmetrical biraphid
TYPE SPECIES: Prestauroneis integra (W. Smith) Bruder
Valves are lanceolate to lanceolate-elliptical, with subrostrate apices. Near the apices is an undulation in the valve margin. Pseudosepta are present at the apices. The striae are radial at the center of the valve, becoming nearly parallel at the apices. The striae are uniseriate and composed of small, round or elliptical poroids. At the center of the valve, striae are separated by thickened costae. The external proximal raphe ends are expanded, while the internal proximal raphe ends are simple and slightly curved. The distal raphe ends are deflected unilaterally. The cingulum is composed of several open, porous bands with one or two rows of small round poroids.
Prestauroneis includes the former Navicula integra W. Smith and the more recently described P. tumida Levkov and Williams 2011.
Cite This Page:
Spaulding, S., and Metzeltin, D. (2013). Prestauroneis. In Diatoms of the United States. Retrieved September 21, 2014, from http://westerndiatoms.colorado.edu/taxa/genus/prestauroneis