  Several years ago we have proposed a manifestly covariant
$\tilde{U}(12)_{SF}$-classification scheme of hadrons, which maintains the
successful $SU(6)_{SF}\otimes O(3)_{L}$ framework in Non-Relativistic Quark
Model and is also reconcilable with the mechanism of Spontaneously-Broken
Chiral Symmetry in Relativistic Field Theoretical Models. The essential point
here is to notice the overlooked freedom of the $SU(2)_{\rho}$-spin for
(confined) light quarks, which leads to existence of new type of ``exotic''
hadrons, called ``chiralons'' and to a selection rule, $\rho_{3}$-line rule, on
the spectator quark line. A series of puzzling new hadrons recently observed
such as X(3872)-meson family and $\Theta (1540)$ and so on are possibly
classified mostly as chiralons.
