1971
Hystichosphaeridium (?) insigne Fridrichsone, sp. n. — Fridrichsone,, pp. 14, fig. II10-22
1974
Baltisphaeridium Insigne (Fridrichsone) comb. nov. — Volkova, pp. 195, fig. 27:2-7
1982
Skiagia insigne (Fridrichsone, 1971) comb. nov. — Downie, pp. 263