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The paper completes the study of symmetries of parabolic functionsingularities with relation to complex crystallographic groups that was startedin \cite{GM,X9}. We classify smoothable automorphisms of $P_8$ singularitieswhich split the kernel of the intersection form on the second homology. Forsuch automorphisms, the monodromy groups acting on the duals to the eigenspaceswith degenerate intersection form are then identified as some of complex affinereflection groups tabled in \cite{P}.

Automorphisms of $P_8$ singularities and the complex crystallographic groups