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Hystrichosphaeridium aemulum
Hystrichosphaeridium aemulum Deflandre, 1938; Emendation: Below, 1982b, p.139-140, as Rigaudella aemula.
Now Rigaudella. Originally Hystrichosphaeridium, subsequently Cannosphaeropsis, thirdly Adnatosphaeridium, fourthly (and now) Rigaudella.
Taxonomic junior synonym: Cannosphaeropsis paucispina, according to Below (1982b, p.139).
Holotype: Deflandre, 1938, pl.11, fig.1
Paratypes: Deflandre, 1938
Locus typicus: Villers-sur-Mer, Calvados, France
Stratum typicum: Oxfordian
Translations Deflandre, 1938 and Below, 1982: LPP
Original description: Deflandre 1938, p. 187-189
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 neighboring 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 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. The membrane of the central body and the processes seem smooth, but polluting particles render it a punctate nature."
Now Rigaudella. Originally Hystrichosphaeridium, subsequently Cannosphaeropsis, thirdly Adnatosphaeridium, fourthly (and now) Rigaudella.
Taxonomic junior synonym: Cannosphaeropsis paucispina, according to Below (1982b, p.139).
Holotype: Deflandre, 1938, pl.11, fig.1
Paratypes: Deflandre, 1938
Locus typicus: Villers-sur-Mer, Calvados, France
Stratum typicum: Oxfordian
Translations Deflandre, 1938 and Below, 1982: LPP
Original description: Deflandre 1938, p. 187-189
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 neighboring 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 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. The membrane of the central body and the processes seem smooth, but polluting particles render it a punctate nature."