Dinoflagellates

Definition

Dinoflagellates are a group of unicellular eukaryotic organisms found in marine and freshwater environments. They can be photosynthetic, heterotrophic, or mixotrophic and are known for their two distinct flagella.

5 Must Know Facts For Your Next Test

1. Dinoflagellates have two flagella: one that wraps around the cell and another that extends backwards.
2. Some dinoflagellates produce toxins that can cause harmful algal blooms (HABs), also known as red tides.
3. They possess cellulose plates called thecae that form a protective armor around their cells.
4. Dinoflagellates exhibit bioluminescence, emitting light when disturbed.
5. Symbiotic dinoflagellates, such as zooxanthellae, live inside coral reefs and provide them with nutrients via photosynthesis.

Review Questions

• What structural feature distinguishes dinoflagellates from other unicellular eukaryotes?
• How do dinoflagellates contribute to harmful algal blooms?
• In what symbiotic relationship do dinoflagellates play a crucial role?

Related terms

Algae: Photosynthetic organisms found in aquatic environments.

Harmful Algal Blooms (HABs): Rapid growth of algae producing toxins detrimental to marine life and humans.

Zooxanthellae: Symbiotic dinoflagellates living within coral tissues providing them with nutrients through photosynthesis.