Compare Neidium amphigomphus
Neidium sacoense has smaller valves and more cuneate apices.
Neidium fossum has a broader central area and one broad longitudinal canal with associated smaller canals on each side of the valve.
Neidium dilatatum has smaller, more rounded areolae, and larger valves.
Neidium amphigomphus var. obtusum has an elliptical valve outline.
Neidium amphigomphus f. curtum is a species belonging to the genus Luticola and has triundulate valve margins.
Neidium iridis is typically larger, and has a row of irregular depressions on one side of the raphe.
LM scalebar = 10 µm
Length Range
49.9-138.6 µm
49.9-138.6 µm
Width Range
22-31.7 µm
22-31.7 µm
Striae in 10 µm
15-16
15-16
Length Range
46.4-98.7 µm
46.4-98.7 µm
Width Range
18-24 µm
18-24 µm
Striae in 10 µm
15-16
15-16
Length Range
154-231 µm
154-231 µm
Width Range
40-49 µm
40-49 µm
Striae in 10 µm
15-16
15-16
Length Range
66.7-129.7 µm
66.7-129.7 µm
Width Range
20.1-24.9 µm
20.1-24.9 µm
Striae in 10 µm
17-20
17-20
Length Range
145-261 µm
145-261 µm
Width Range
32-37 µm
32-37 µm
Striae in 10 µm
12-13
12-13
