  Most of the exotic hadrons discovered over the last 20 years fit into the
quark model as normal mesons and baryons if the existence of a seventh flavor
of quark is hypothesized. For the quark to reproduce the mass, spin, parity,
production and decay modes of exotic hadrons, it would have to have a mass of
$\sim$2.8 GeV, a charge of $-\tfrac{1}{3}$, and a W-boson-mediated interaction
with the right-chiral component of the charm quark. The proposed spectrum of
hadrons involving this quark is presented.
