Diatoms of North AmericaDiatoms of North America
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Compare Tetracyclus rupestris

(Braun ex Rabenh.) Grunow in Van Heurck 1885

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Odontidium mesodon differs by its numerous secondary and tertiary costae, spines, more rigidly defined axial area, and lack of septae. Valves of T. rupestris are more elliptic in valve shape, with broader, rounder apices than T. hinziae.

LM scalebar = 10 µm
Tetracyclus rupestris LM4 Tetracyclus rupestris LM1 Tetracyclus rupestris LM6 Tetracyclus rupestris LM2 Tetracyclus rupestris LM7 Tetracyclus rupestris LM3 Tetracyclus rupestris LM5
Length Range
8.0-22.4 µm
Width Range
4.7-8.4 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

Tetracyclus hinziae

Bishop and Spaulding 2015

Tetracyclus hinziae LM3 Tetracyclus hinziae LM1 Tetracyclus hinziae LM6 Tetracyclus hinziae LM7 Tetracyclus hinziae LM2 Tetracyclus hinziae LM4 Tetracyclus hinziae LM5
Length Range
8.2-35.5 µm
Width Range
5.6-14.0 µm
Striae in 10 µm
20-27