| class | class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle |
|---|---|
| class | cone-bearing gymnosperms dating from the Carboniferous period |
| class | sea lilies |
| class | class of mandibulate arthropods including: lobsters |
| class | motile usually brownish-green protozoa-like algae |
| class | photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins |
| class | photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins |
| class | palmlike gymnosperms: includes the surviving order Cycadales and several extinct orders |
| class | in more recent classifications superseded by the order Fucales |
| class | form class |
| class | marine and freshwater eukaryotic algae: diatoms |
| class | comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves |