Compare Cocconeis grovei
Compare
Most Cocconeis species currently living in North American are much smaller than C. grovei. Cocconeis placentula has a larger length to width ratio (>1.6) and a narrow marginal area of striae on the raphe valve. Cocconeis klamathensis has more highly arched valves and a lanceolate marginal hyaline ring on the raphe valve. Cocconeis pediculus lacks a hyaline ring, has more highly arched valves, and a lower stria density on the rapheless valves (6-11 in 10 µm). Cocconeis rugosa has hyaline areas, branching from each apex.
LM scalebar = 10 µm
Length Range
45-78 µm
45-78 µm
Width Range
30-56 µm
30-56 µm
Striae in 10 µm
14-17 raphe valves, 14-22 rapheless valves
14-17 raphe valves, 14-22 rapheless valves
Cocconeis placentula sensu lato
Length Range
9-68 µm
9-68 µm
Width Range
7-32 µm
7-32 µm
Striae in 10 µm
20-24 on raphe valve, 15-25 on rapheless valve
20-24 on raphe valve, 15-25 on rapheless valve
Cocconeis pediculus
Length Range
17.0-41.5 µm
17.0-41.5 µm
Width Range
14-23 µm
14-23 µm
Striae in 10 µm
16-22 in the raphe valve center, 16-21 in the rapheless valve center
16-22 in the raphe valve center, 16-21 in the rapheless valve center
