Dilatisphaera williereae (Martin, 1966) Lister? 1970

Combination not validly published since Lister, 1970 did not clearly use the name Dilatisphaera williereae.
Now Palaeohystrichosphaeridium (an acritarch genus). Originally Hystrichosphaeridium, subsequently Dilatisphaera (combination not validly published), thirdly (and now) Palaeohystrichosphaeridium (an acritarch genus).
Tax. sr. synonym of the acritarch species Ozotobrachion? podolicus Sheshegova, 1973 according to Kiryanov, 1978.
Holotype: Martin, 1966, pl.1, fig.23
Age: Silurian