| Name | Vallithidium Nienow & A. K. S. Prasad |
| Authorship | Nienow & A. K. S. Prasad |
| Rank | Genus |
| Placed in | Achnanthidiaceae D. G. Mann |
| Contains | Vallithidium campechianum Nienow & A. K. S. Prasad Vallithidium marginulatum Nienow & A. K. S. Prasad |
| Remarks | Etymology: The name incorporates the distinctive feature of a deep depression, or hollow, in the raphe-less valve (from the Latin vallis = valley, hollow). Type species: Vallithidium marginulatum (Cleve) J.A. Nienow & A.K.S.K. Prasad (Basionym: Navicula marginulata Cleve, 1881) |
| Citation | 2023 [14 Nov 2023] Diatom Res. 2023(https://doi.org/10.1080/0269249X.2023.2267049): 4 |
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