Hemiaulus membranaceus
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 28-55 μm wide x 32-40 μm long (LUMCON Guide); 30-97 μm wide (Cupp 1943) |
| Key Characteristics: | In girdle view cells range from almost square to five or six times wider than long; valves concave or nearly flat; horns short with a more or less sharp point; cell wall lightly silicified and areolation indistinct |
| Confused With: | |
| Toxin: | None known |