  In this paper we present a dynamical analysis for a coupled tachyonic dark
energy with dark matter. The tachyonic field $\phi$ is considered in the
presence of barothropic fluids (matter and radiation) and the autonomous system
due to the evolution equations is studied. The three cosmological eras
(radiation, matter and dark energy) are described through the critical points,
for a generic potential $V(\phi)$.
