Hystrichosphaeridium inodes Klumpp, 1953, p.391, pl.18, figs.1–2. Emendations: Morgenroth, 1968, p.549–550, as Cordosphaeridium inodes; Sarjeant, 1981, p.102–105, as Cordosphaeridium inodes — however, see Lentin and Williams (1985, p.72).

NOW Cordosphaeridium. Originally Hystrichosphaeridium, subsequently (and now) Cordosphaeridium.

Holotype: Klumpp, 1953, pl.18, fig.1-2
Paratypes: Klumpp, 1953
Locus typicus: W÷hrden near Heide, Holstein, Germany
Stratum typicum: Late Eocene
Translation Klumpp, 1953: LPP

Original description: Klumpp, 1953, p. 391-392
Diagnosis: A species of the genus Hystrichosphaeridium with the following special charaterictics: the shell membrane is bilayered, the outer layer consists of short fibres, standing perpendicular to the surface. From this fibrous layer the processes, irregularly fraying distally, are built.
Dimensions: diameter 64 µm, process length 28-36 µm. Variation: diameter 52-76 µm, process length 20-40 µm.
The size of the processes is very variable per specimen, and their number in several specimens is very diverse.