Diatoms of North AmericaDiatoms of North America
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Compare Neidium rugosum

P.B.Hamilton, M.G.Potapova and L.I.Kopyrina 2014

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Neidum fossum is easily confused with this taxon. Many features are shared, but N. fossum has a higher stria density of 17-20 in 10 µm.

Neidium iridis, N. dilatatum, N. tumescens, and N. amphigomphus are larger. Neidium iridis has depressions on the secondary side of the raphe.

LM scalebar = 10 µm
Neidium rugosum LM1 Neidium rugosum LM2 Neidium rugosum LM3 Neidium rugosum LM4 Neidium rugosum LM5 Neidium rugosum LM6 Neidium rugosum LM7
Length Range
81.8-154.6 µm
Width Range
21.9-29.9 µm
Striae in 10 µm
16-18

Neidium fossum

Lefebvre and P.Ham. 2015

Neidium fossum LM6 Neidium fossum LM5 Neidium fossum LM4 Neidium fossum LM3 Neidium fossum LM2 Neidium fossum LM1
Length Range
66.7-129.7 µm
Width Range
20.1-24.9 µm
Striae in 10 µm
17-20

Neidium iridis

(Ehrenb.) Cleve 1894

Neidium iridis LM4 Neidium iridis LM5 Neidium iridis LM2 Neidium iridis LM3 Neidium iridis LM6 Neidium iridis LM1
Length Range
145-261 µm
Width Range
32-37 µm
Striae in 10 µm
12-13

Neidium dilatatum

(Ehrenb.) Cleve 1894

Neidium dilatatum 1 L1430 Neidium dilatatum 2 L1428 Neidium dilatatum 3 L1428 Neidium dilatatum 4 L1428 Neidium dilatatum 5 L1428 Neidium dilatatum 6 L1430 Neidium dilatatum 7 L1430
Length Range
154-231 µm
Width Range
40-49 µm
Striae in 10 µm
15-16

Neidium amphigomphus

(Ehrenb.) Pfitzer emend. K.Lefebvre and P.B.Ham. 2015

Neidium amphigomphus LM6 Neidium amphigomphus LM5 Neidium amphigomphus LM4 Neidium amphigomphus LM3 Neidium amphigomphus LM2 Neidium amphigomphus LM1
Length Range
49.9-138.6 µm
Width Range
22-31.7 µm
Striae in 10 µm
15-16

Also compare to

Neidium tumescens

(Grun.) Cleve