Micrhystridium Appendix A

MICRHYSTRIDIUM Deflandre, 1937b, p.79.  Emendations: Staplin, 1961, p.408; Sarjeant, 1967c, p.204; Lister, 1970, p.77; Sarjeant and Stancliffe, 1994, p.12.  Acritarch genus.  Taxonomic junior synonym: Solisphaeridium (Appendix A), according to Sarjeant and Stancliffe (1994, p.12) - however, Moczydłowska (1998, p.98) retained Solisphaeridium.  For further synonymy, see Fensome et al. (1990, p.315) and Sarjeant and Stancliffe (1994, p.12).  Type: Deflandre, 1937b, pl.12 (al. pl.9), fig.11, as Micrhystridium inconspicuum.