  We discuss the dimensional reduction of fermionic modes in a recently found
class of consistent truncations of D=11 supergravity compactified on squashed
seven-dimensional Sasaki-Einstein manifolds. Such reductions are of interest,
for example, in that they have $(2+1)$-dimensional holographic duals, and the
fermionic content and their interactions with charged scalars are an important
aspect of their applications. We derive the lower-dimensional equations of
motion for the fermions and exhibit their couplings to the various bosonic
modes present in the truncations under consideration, which most notably
include charged scalar and form fields. We demonstrate that our results are
consistent with the expected supersymmetric structure of the lower dimensional
theory, and apply them to a specific example which is relevant to the study of
$(2+1)$-dimensional holographic superconductors.
