  Particle dynamics in the electron current layer in collisionless magnetic
reconnection is investigated by using a particle-in-cell simulation. Electron
motion and velocity distribution functions are studied by tracking
self-consistent trajectories. New classes of electron orbits are discovered:
figure-eight-shaped regular orbits inside the electron jet, noncrossing regular
orbits on the jet flanks, noncrossing Speiser orbits, and nongyrotropic
electrons in the downstream of the jet termination region. Properties of a
super-Alfv\'{e}nic outflow jet are attributed to an ensemble of electrons
traveling through Speiser orbits. Noncrossing orbits are mediated by the
polarization electric field near the electron current layer. The noncrossing
electrons are found to be non-negligible in number density. The impact of these
new orbits to electron mixing, spatial distribution of energetic electrons, and
observational signatures, is presented.
