Hystrichosphaeridium costatum
From dinoflaj2
"costatum" Davey and Williams, 1966b, p.62, pl.10, fig.4. 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: Hystrichosphaeridium
