Cannosphaeropsis aemulum, (Deflandre, 1938), Deflandre, 1947

Now Rigaudella. Originally Hystrichosphaeridium, subsequently Cannosphaeropsis, thirdly Adnatosphaeridium, fourthly (and now) Rigaudella.
Tax. sr. synonym of Cannosphaeropsis paucispina Klement, 1960, according to Below, 1982.

Holotype: Deflandre, 1938, pl.11, fig.1
Locus typicus: Villers-sur-Mer, Calvados, France
Stratum typicum: Oxfordian

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Original description as Hystrichosphaeridium aemulum: [Deflandre 1938, p. 187-189]: (Translations: LPP):

Description (annotated):
the central body is generally spherical, ellipsoidal or lenticular, depending on flattening and angle of observation. From the central body, processes stem, some solid, some hollow, some both, that develop funnel-shaped, and split up in two or three net-forming trabeculae connecting two neighbouring processes. There are ten to fifteen processes, sometimes either all quite lean or all quite enlarged. In some cases they fuse to form a kind of bunch. The flexible and branching transversal trabeculae are solid, but certainly do not resemble those of Cannosphaeropsis utinensis O. Wetzel.
The membrane of the central body and the processes seem smooth, but polluting particles render it a punctate nature.

Dimensions:
The central body measures about 35 µm, but may vary from 25-45 µm. The total size is 60-90 or 100 µm. The length of the processes is 18-25 µm.