Hystrichosphaeridium brevispinosum ssp. callosum Sannemann, 1955

Now Baltisphaeridium brevispinosum ssp. callosum. Originally Hystrichosphaeridium brevispinosum ssp. callosum, subsequently (and now) Baltisphaeridium brevispinosum ssp. callosum. See also Buedingiisphaeridium breispinosum ssp. callosum (combination not validly published).

Holotype: Sannemann, 1955, pl.4, fig.3
Age: Devonian (Late Givetian)