Baltisphaeridium parvispinum (Deflandre, 1937) Klement, 1960

Now Prolixosphaeridium parvispinum. Originally Hystrichosphaeridium? xanthiopyxides var. parvispinum, subsequently Hystrichosphaeridium parvispinum, thirdly Baltisphaeridium parvispinum, fourthly (and now) Prolixosphaeridium parvispinum.
olotype: Deflandre, 1937, pl.16 [al. pl.13], fig.5
Age: Late Aptian