  We investigate the dynamics of a single deformable self-propelled particle
which undergoes a spinning motion in a two-dimensional space. Equations of
motion are derived from the symmetry argument for three kinds of variables. One
is a vector which represents the velocity of the centre of mass. The second is
a traceless symmetric tensor representing deformation. The third is an
antisymmetric tensor for spinning degree of freedom. By numerical simulations,
we have obtained variety of dynamical states due to interplay between the
spinning motion and the deformation. The bifurcations of these dynamical states
are analyzed by the simplified equations of motion.
