Influence des courants sur l'éthologie alimentaire des phoronidiens. Etude par séries de photographies cycliques

Subjected to water currents, phoronideans orientate their lophophores as follows: the mouth is turned into the current at the bottom of a funnel formed by the tentacles; the anus, behind the lophophore, is under the current. If the current direction changes, the position of the lophophore moves in the same direction. Our results confirm Bullivant's (1968) classification of Phoronidea as “impingement feeders”. The technics of a new automatic shutter release are described.