Actinastrum sp.
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| Taxonomic Group: | Chlorophyte |
| Trophic Status: | Autotrophic |
| Size Range: | N/A |
| Key Characteristics: | Cells much longer than broad, cylindrical, or cigar-shaped, radiating out from a common center to form colonies of 4-8-16-cells; chloroplast is elongate, parietal, with one pyrenoid |
| Confused With: | At first glance this could be mistaken for a diatom like Asterionellopsis glacialis or Thalassionema frauenfeldii, but closer examination shows cigar-shaped cells radiating out three dimensionally from a central point |
| Toxin: | None known |