Batiacasphaera rioultii, (Sarjeant, 1968), Dörhöfer and Davies, 1980; Emendation: Courtinat, 1989, p.192, as Sentusidinium rioultii.

Now Sentusidinium. Originally Tenua Eisenack, 1958, subsequently Batiacasphaera, thirdly (and now) Sentusidinium; see also Tenua Davey, 1978 (combination illegitimate).
Lentin and Williams, 1981, retained this species in Sentusidinium Sarjeant and Stover, 1978.

Holotype: Sarjeant, 1968, pl.1, fig.22; pl.2, fig.1; Eisenack and Kjellström, 1972, p.1043, figure to left; Fensome et al., 1995, fig.1 - p.1743; Fauconnier and Masure, 2004, pl.70, fig.4.
Paratype: Sarjeant, 1968
Locus typicus: Marnes de Dives, Falaise des Vaches Noires, Villers-sur-Mer, France
Stratum typicum: uppermost Callovian

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Original description as Tenua rioultii: [Sarjeant, 1968, p. 231]:

Diagnosis:
Shell broadly ovoidal, with a pronouncedly granular surface.
Spines numerous (around 200), well spaced, varying in length but always short (ranging in length between one-fifth and one ninth of the shell breadth). Spines highly variable in thickness and in form: they may be capitate, bifurcate or trifurcate, with branches of equal or unequal length which may themselves bifurcate.
Cingulum and sulcus lack spines; the cingulum is relatively narrow, the sulcus broader.
Apical archaeopyle generally or consistently developed, with a pronouncedly scalloped margin.

Dimensions:
Holotype: overall length (apex lacking) 48 µm, breadth 50.5 µm; shell length 45 µm, breadth 45 µm.
Paratype: overall length (apex lacking) 61.5 µm, breadth 69 µm; shell length 53 µm, breadth 59 µm.
Range: overall length (apices lacking) 48-62 µm, breadth 50.5-69 µm, shell length 45-57 µm, breadth 44. 5-57 µm.