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Also known as blue-green algae, these are photosynthetic bacteria that inhabit freshwater, salt water and damp soil.

Microscopic animal-like organisms that feed on phytoplankton and other small particles in the water, and are themselves food for larger predators.

A type of zooplankton, these single-celled organisms have intricate silica-based skeletons and are found in the ocean column.

Small, often microscopic crustaceans that are a key part of marine and freshwater plankton communities, serving as a major food source for fish and other larger aquatic organisms.

Tiny photosynthetic plankton, primarily composed of bacteria and archaea, that are less than 2 micrometers in size and play a significant role in the carbon cycle of the oceans.

Single-celled plankton with two whip-like flagella, some photosynthesize while others are predatory, and they can cause red tides.

Small marine crustaceans found in all the world's oceans, they feed on phytoplankton and are a crucial food source for many larger marine animals, especially whales.

Single-celled protists with varying shells that can be found as zooplankton drifting in the sea, important for marine sediment as their shells remain as a fossil record after they die.

Microscopic plant-like organisms that form the base of the aquatic food web, producing energy through photosynthesis.