Baltisphaeridium xanthiopyxides, (O. Wetzel, 1933), Downie and Sarjeant, 1965

Now Tanyosphaeridium. Originally Hystrichosphaera, subsequently Hystrichosphaeridium, thirdly Hystrichosphaeridium?, fourthly Baltisphaeridium, fifthly Prolixosphaeridium?, sixthly (and now) Tanyosphaeridium. This combination was not validly published in Klement, 1960 since that author did not fully reference the basionym.

Holotype: O. Wetzel, 1933, pl.4, fig.25; Morgenroth, 1968, pl.48, fig.5; Sarjeant, 1985, pl.3, figs.2-3
Age: Senonian