Fig. 5.

Stroke hydrodynamics of euglenid #4. (A) Flow pattern around the pellicle at selected instants along the stroke. The fluid velocity field in the symmetry plane is indicated by blue arrows, and the azimuthal component is shown with isocontours, where green is zero, blue negative, and red positive. (B) Relationship between actuation and forward motion, where the vertical axis is the body coordinate λ for the color map of γ(λ,t) and z position (average between the head and the tail) in units of body length for the curve in blue. Both the actuation pattern and the forward motion clearly delineate a power and a recovery phase in the stroke.