  The research on emergent particles in condensed matters has been attracting
tremendous interest, and recently it is extended to magnetic systems. Here, we
study the emergent particles stabilized by the symmetries of type-IV magnetic
space groups (MSGs). Type-IV MSGs feature a special time reversal symmetry
$\{\mathcal{T}|\boldsymbol{t}_0\}$, namely, the time reversal operation
followed by a half lattice translation, which significantly alters the symmetry
conditions for stabilizing the band degeneracies. In this work, based on
symmetry analysis and modeling, we present a complete classification of
emergent particles in type-IV MSGs by studying all possible (spinless and
spinful, essential and accidental) particles in each of the 517 type-IV MSGs.
Particularly, the detailed correspondence between the emergent particles and
the type-IV MSGs that can host them are given in easily accessed interactive
tables, where the basic information of the emergent particles, including the
symmetry conditions, the effective Hamiltonian, the band dispersion and the
topological characters can be found. According to the established encyclopedia,
we find that several emergent particles that are previously believed to exist
only in spinless systems will occur in spinful systems here, and vice versa,
due to the $\{{\cal T}|\boldsymbol{t}_{0}\}$ symmetry. Our work not only
deepens the understanding of the symmetry conditions for realizing emergent
particles but also provides specific guidance for searching and designing
materials with target particles.
