Hystrichosphaeridium parvispinum

"parvispinum" (Deflandre, 1937b, p.77, pl.16 [al. pl.13], fig.5) Cookson and Eisenack, 1958, p.45.  Holotype: Deflandre, 1937b, pl.16 (al. pl.13), fig.5; Fauconnier and Masure, 2004, pl.66, figs.5-6.  NOW Prolixosphaeridium parvispinum.  Originally Hystrichosphaeridium? xanthiopyxides var. parvispinum, subsequently Hystrichosphaeridium parvispinum, thirdly Baltisphaeridium parvispinum (Appendix A), fourthly (and now) Prolixosphaeridium parvispinum.  Taxonomic junior synonyms (at specific and varietal ranks): Prolixosphaeridium elongatum, according to Lentin and Williams (1985, p.294); Prolixosphaeridium deirense, according to Davey and Verdier (1974, p.636-637) - however, Harding (1990b, p.46) retained Prolixosphaeridium deirense.  Age: Late Aptian.

Parent: Hystrichosphaeridium