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Marine Animal Encyclopedia

Protoperidinium depressum

Like most dinoflagellates, Protoperidinium depressum is a single-celled organism with a complex armored test. It is widest in the mid-region where there is a prominent groove, called the cingulum, which encircles the body and houses a whiplike flagellum. Movement of this and a second flagellum set at right angles to it causes the typical spiral motion of the cell. This ability to move allows Protoperidinium depressum to predate other small organisms. Also capable of bioluminescence, it has been mistaken for Noctiluca scintillans.

  • Kingdom Dinoflagellata
  • Length Up to 0.3 mm
  • Habitat Open water
  • Distribution Worldwide