  Minimally doubled fermions realize one degenerate pair of Dirac fermions on
the lattice. Similarities to staggered fermions exist, namely, spin and taste
degrees of freedom become intertwined, and a remnant, non-singlet chiral
symmetry and ultralocality are maintained. However, charge conjugation,
isotropy and some space-time reflection symmetries are broken by the cutoff.
For two variants, i.e., Karsten-Wilczek (KW) or Borici-Creutz (BC) fermions, a
tasted charge conjugation symmetry can be identified, and the respective
representations of the spin-taste algebra can be constructed explicitly. In the
case of BC fermions, the tasted symmetry indicates that amendments to the
published counterterms are necessary. The spin-taste representation on the
quark level permits construction of local or extended hadron interpolating
operators for any spin-taste combination, albeit with contamination by parity
partners and taste-symmetry violation. The few available numerical results for
KW fermions are in line with expectations.
