Cleistosphaeridium polypetellum
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polypetellum (Islam, 1983c, p.82,84, pl.2, figs.1–6) Stover and Williams, 1995, p.102. Holotype: Islam, 1983c, pl.2, fig.1. Originally Areosphaeridium, subsequently (and now) Cleistosphaeridium. Taxonomic senior synonym: Cleistosphaeridium (as Systematophora) diversispinosum, according to Islam (1993, p.88) — however, Eaton et al. (2001, p.194) retained Cleistosphaeridium polypetellum. Eaton et al. (2001, p.194) also proposed this combination. Age: early-middle Eocene.
Parent: Cleistosphaeridium