Cleistosphaeridium ehrenbergii, (Deflandre, 1947), Davey et al., 1969

NOW Impletosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly (and now) Impletosphaeridium.
Stover and Evitt, 1978, considered this to be a problematical species of Cleistosphaeridium.
Nomencl. sr. synonym of Cleistosphaeridium deflandrei Courtinat, 1989, since both species have the same holotype. Courtinat, 1989, erected the species Cleistosphaeridium deflandrei and designated as holotype the specimen illustrated in Deflandre, 1938, pl.10, fig.9) and Deflandre, 1947, text-fig.1, no.5. This is the only specimen of Hystrichosphaeridium ehrenbergii illustrated by Deflandre, 1947, when he erected this species.
Courtinat, 1989, considered Hystrichosphaeridium ehrenbergii Deflandre, 1947, to be a nomen nudum, since Deflandre, 1947, did not give a diagnosis or designate a holotype. According to Lentin and Williams, 1993, referring to the ICBN, Hystrichosphaeridium ehrenbergii Deflandre, 1947, must be regarded as a validly published species and Cleistosphaeridiuim deflandrei Courtinat, 1989, as an illegitimate name, being a nomenclatural junior synonym of Hystrichosphaeridium ehrenbergii.
Tax. sr. synonym of Cleistosphaeridium deflandrei Courtinat, 1989, according to Wheeler, 1991.
This combination was not validly published in Davey et al., 1966, since these authors did not fully reference the basionym.

Holotype: Deflandre, 1939a, pl.10, fig.9, as Hystrichosphaeridium cf. hirsutum; Deflandre, 1947c, fig.1, no.5; Fauconnier and Masure, 2004, pl.48, figs.9,11.
Age: Oxfordian

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Supplemental description:

Gitmez, 1970, p. 284:

Description:
The subspherical shell bears simple straight, solid, conical and distally closed processes in large number (30-44). The shell surface is smooth. Sometimes an apical archaeopyle is developed.

Dimensions:
Figured specimen: shell length 35 µm, breadth 38 µm; process length 15-18 µm.
Range of the English specimens (9 specimens measured): shell length 45-62 µm, breadth 45-50 µm;
French specimens (2 specimens measured): shell length 48-65 µm, breadth 45-50 µm. In all specimens, length of the process 15-25 µm, breadth 1-5 µm.
Dimensions of the Scottish specimen: shell length 30 µm, breadth 30 µm; process length 16 µm.