Hystrichosphaeridium perplexum

?perplexum Varma and Dangwal, 1964, p.64, pl.1, figs.5–6. Holotype: Varma and Dangwal, 1964, pl.1, figs.5–6. Originally Hystrichosphaeridium, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Eocene–Oligocene.