Diatoms of North AmericaDiatoms of North America
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Compare Amphora copulata

(Kütz.) Schoeman and R.E.M.Archibald 1986

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Amphora ovalis lacks a clear dorsal fascia.
Amphora inariensis has a smaller size range, although the two species overlap in size range. 

LM scalebar = 10 µm
Amphora copulata LM6 Amphora copulata LM4 Amphora copulata LM7 Amphora copulata LM5 Amphora copulata LM1 Amphora copulata LM3 Amphora copulata LM2
Length Range
12-62 µm
Width Range
4-10 µm
Striae in 10 µm
14-17

Amphora ovalis

(Kütz.) Kütz. 1844

Amphora ovalis LM4 Amphora ovalis LM2 Amphora ovalis LM1 Amphora ovalis LM3 Amphora ovalis LM5
Length Range
32-95 µm
Width Range
8-17 µm
Striae in 10 µm
10-12

Also compare to

Amphora inariensis

Krammer