Which type of organism causes a "red tide"?

A) euglenoids
B) water molds
C) brown algae
D) green algae
E) dinoflagellates

Red Tide

A population bloom of dinoflagellates that causes coastal waters to turn red. Releases a toxin that can lead to paralytic shellfish poisoning.

Dinoflagellates

A group of protists characterized by their two beating flagella, some of which are photosynthetic, while others can cause red tides.

Euglenoids

A diverse group of unicellular flagellate protists, often found in fresh water, and characterized by the presence of a pellicle, chloroplasts for photosynthesis, and a unique method of motility.