Hystrichosphaeridium hymenoferum Eisenack, 1938

Now Peteinosphaeridium. Originaily Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Peteinosphaeridium.

Holotype: Eisenack, 1938, pl.3, fig.2
Age: Ordovician (based on material from an erratic)