Diatoms of North AmericaDiatoms of North America
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Compare Neidium fossum

Lefebvre and P.Ham. 2015

Compare

Neidum rugosum is easily confused with this taxon. Many features are shared, but N. rugosum has a lower stria density of 16-18 in 10 µm.

Neidium iridis is longer, has rostrate to sagittate apices, and a single longitudinal canal.

Neidium amphigomphus has nearly parallel valve margins, acute apices, and multiple (3-5) narrow longitudinal canals.

Neidium dilatatum is larger and has multiple (5+) narrow, longitudinal canals.

LM scalebar = 10 µm
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 rugosum

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

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 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 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

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