Asteromphalus sp.
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 15-180 μm diameter, depending on species (Tomas 1997) |
| Key Characteristics: | Cells solitary, oblong to elliptical; long chambers (hyaline rays) radiate from a central area and terminate near the valve margin and one ray is narrower than the others; the number of rays varies with species |
| Confused With: | Asterolampra species, which have hyaline rays all the same shape and width |
| Toxin: | None known |