Cordosphaeridium costatum

"costatum" (Davey and Williams, 1966b, p.62, pl.10, fig.4) Górka, 1970, p.489–490.  Holotype: Davey and Williams, 1966b, pl.10, fig.4; Stancliffe and Sarjeant, 1990, pl.3, fig.1.  NOW Compositosphaeridium Dodekova.  Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly (and now) Compositosphaeridium Dodekova.  Taxonomic senior synonym: Hystrichosphaeridium (now Compositosphaeridium?) polonicum, according to Beju (1971, p.292) — however, Masure in Fauconnier and Masure (2004, p.137) retained Compositosphaeridium costatum.  Age: Oxfordian.

Parent: Cordosphaeridium