Cleistosphaeridium ancyreum

ancyreum (Cookson and Eisenack, 1965a, p.126, pl.14, figs.1–3) Eaton et al., 2001, p.191.  Holotype: Cookson and Eisenack, 1965a, pl.14, fig.1; Fauconnier and Masure, 2004, pl.76, figs.1–3.  Originally Systematophora ancyrea, subsequently Systematophora placacantha var. ancyrea (combination not validly published), thirdly (and now) Cleistosphaeridium ancyreum.  Taxonomic senior synonym: Hystrichosphaeridium (now Cleistosphaeridium) placacanthum, according to Stover and Evitt (1978, p.84) — however, Lentin and Williams (1981, p.272) retained Systematophora ancyrea.  Age: late Eocene.

Parent: Cleistosphaeridium