No abstract

Adinoflagellate Symbiodinium swims ferward by using its transverse flagellum ． The propagating wave of the transverse flagellum generates torque of the swimming direction ． From this fact ， the cell body is assumed to rotate to the opposite direction ofthe wave propagation to balance the total torque ． In this stUdy ， the rotational direction was observed to compare With the previously ebtained numerical result ． Because the transparent cell body is di 価 cult to determine whether the cell body is in the front or back of the focal plane of the objective lens ， we conducted the biplane observation ， where tWo objective lenses are fbcused on a single celL The observed rotational direction was opPosite to that in the prediction ． Key Merds：Dinofiagellate ， Rotation ， Torque ， Biplane observation ， Microorganism