Hystrichosphaeridium isocalamum

"isocalamum" Deflandre and Cookson, 1955, p.272, pl.2, figs.7–8; text-figs.30–35.  Holotype: Deflandre and Cookson, 1955, pl.2, figs.7–8; Fauconnier and Masure, 2004, pl.78, figs.5–8.  NOW Tanyosphaeridium.  Originally Hystrichosphaeridium, subsequently (and now) Tanyosphaeridium.  Age: Early Cretaceous.

Parent: Hystrichosphaeridium