Pinnularia parvulissima should be compared to P. gibba and P. subgibba. Pinnularia gibba is larger in size and has more capitate ends than P. parvulissima. Pinnularia parvulissima is smaller in size and has a smaller length to width ratio than P. subgibba (4.5-6.5 vs. 7-8). Pinnularia parvulissima also has a broader fascia and more convex sides than P. subgibba.

LM scalebar = 10 µm
888 Gray 651 Gray 623 Gray 546 Gray 474 Gray 468 Gray 411 Gray
Length Range
40-88 µm
Width Range
9-12 µm
Striae in 10 µm

Also compare to

Pinnularia gibba


Pinnularia subgibba