Diatoms of North AmericaDiatoms of North America
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Compare Odontidium hyemale

(Roth) Kütz. 1844

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Odontidium mesodon does not have as great a maximum length, valves are more rhombic and apicies are more apiculate. In addition, the axial area of O. mesodon is more narrow, costae are more often primary, extending fully across the valve. Diatoma moniliformis valves are much narrower and costae are less dense.

LM scalebar = 10 µm
Odontidium hyemale LM4 Iwb 0002 2 20170509 05 Cl Odontidium hyemale LM1 Iwb 0002 2 20170509 03 Cl Iwb 0025 1 20170509 05 Cl Odontidium hyemale LM2 Odontidium hyemale LM3
Length Range
16.7-51.3 µm
Width Range
6.6-10.6 µm
Striae in 10 µm
24-28

Odontidium mesodon

(Ehrenb.) Kütz. 1844

Odontidium mesodon LM7 Odontidium mesodon LM2 Odontidium mesodon LM6 Odontidium mesodon LM4 Odontidium mesodon LM3 Odontidium mesodon LM1 Odontidium mesodon LM5
Length Range
10–40 µm
Width Range
6–12 µm
Striae in 10 µm
25-35

Diatoma moniliformis

Kütz. 1833

Diatoma moniliformis LM4 Diatoma moniliformis LM3 Diatoma moniliformis LM5 Diatoma moniliformis LM1 Diatoma moniliformis LM2
Length Range
10–40 µm
Width Range
2.5-6.0 µm
Striae in 10 µm
50-60