Dinoflagellate
Dinoflagellate
Dinoflagellates (/ˌdaɪnoʊˈflædʒəˌleɪts/) are a large group of flagellate protists. They constitute the phylum Dinoflagellata, which is classified under the supergroup Alveolata. Dinoflagellates are notable for their complex cell structure and their two dissimilar flagella.
Etymology
The term "dinoflagellate" is derived from the Greek words dinos meaning "whirling" and flagellum which translates to "whip" or "scourge". This refers to the two flagella that these organisms possess, one of which encircles the cell and causes a whirling motion.
Characteristics
Dinoflagellates are unicellular and possess two dissimilar flagella arising from the nucleus. One flagellum extends towards the posterior, propelling the cell forward, while the other encircles the cell in a transverse groove. This unique arrangement causes the cell to spin as it moves forward.
Some dinoflagellates are photosynthetic, possessing chloroplasts and are an important part of the phytoplankton. Others are heterotrophic, feeding on other organisms or dead organic material.
Role in Ecosystem
Dinoflagellates play a crucial role in marine ecosystems as primary producers of organic matter. They are also known for their ability to form red tides, which can have harmful effects on marine life and humans.
Related Terms
- Flagellum
- Protists
- Alveolata
- Nucleus
- Photosynthetic
- Chloroplasts
- Phytoplankton
- Heterotrophic
- Red tides
External links
- Medical encyclopedia article on Dinoflagellate
- Wikipedia's article - Dinoflagellate
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