Hystrichosphaeridium hystrichoreticulatum Eisenack, 1938

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

Holotype: Eisenack, 1938, pl.3, figs.6A-B
Age: Ordovician (based on material from an erratic)