Hystrichosphaeridium diktyoplokus Klumpp, 1953, p.392, pl.18, figs.3–7 (not pl.18, figs.8–10, which are now Cordosphaeridium latum). Emendation: Eaton, 1971, p.358–359, as Areosphaeridium diktyoplokum.

Now Areosphaeridium. Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly (and now) Areosphaeridium.
Taxonomic junior synonym: Hystrichosphaeridium (now Areosphaeridium) dictyostilum, according to Eaton (1971, p.359) - however, Sarjeant (1981, p.115) retained Hystrichosphaeridium (as Areosphaeridium) dictyostilum.

Holotype: Klumpp, 1953, pl.18, fig.3-4
Paratypes: Klumpp, 1953
Locus typicus: Borehole at W÷hrden, Holstein, Germany
Stratum typicum: Eocene
Translation Klumpp, 1953: LPP

Original description: Klumpp 1953, p. 392Diagnosis: A species of the genus Hystrichospaeridium with the next characteristic features: The membrane of the shell is one-layered; more or less reticulate ornamented; the processes are bulges of the membrane.
Description: The spherical shell is fragile and very transparent. In spite of their slenderness, the processes are merely tubular bulges of the membrane. The processes end in a sort of soft reticulate collar.