Aulacoseira spp.
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 5.7-7.5 μm wide x 20-22.8 μm long (LUMCON Guide) |
| Key Characteristics: | Cells in linear colonies, joined together by several spines which are sometimes visible on terminal cells; frustules usually heavily silicified |
| Confused With: | Species under Aulacoseira were previously classified in the genus Melosira, a genus now restricted primarily to marine species |
| Toxin: | None known |