Hystrichosphaeridium castaneum Eisenack, 1934 ex Eisenack, 1938

Now Baltisphaeridium castaneum. Originally Hystrichosphaeridium castaneum, subsequently (and now) Baltisphaeridium castaneum. See also Ovum hispidum ssp. castaneum (name not validly published). The name Ovum hispidum ssp. castaneum was not validly pubiished in Eisenack, 1934, since the specific name Ovum hispidum is not validly published.

Holotype: Eisenack, 1934, pl.5, fig.32
Age: Silurian