Batiacasphaera villersensis, (Sarjeant, 1968), Dörhöfer and Davies, 1980

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

Holotype: Sarjeant, 1968, pl.1, fig.16
Locus typicus: Villers-sur-Mer, Falaise des Vaches Noires; France
Stratum typicum: Marnes de Dives (L. lamberti Zone), uppermost Callovian

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Original description as Tenua villersensis: [Sarjeant, 1968, p. 232]:

Diagnosis:
Shell spheroidal to broadly ovoidal, faintly granular. Spines numerous (over 300), well spaced. A very short, broad spine is typically situated at the antapex: the other spines are slender and of very consistent length (around one-tenth of the shell breadth, the median spines being slightly shorter than those in the antapical region).
The spines are often knobbed, capitate or briefly bifurcate, rarely more deeply bifurcate. Cingulum and sulcus lack spines; the cingulum is narrow, the sulcus broader.
Apical archaeopyle generally (or consistently) developed, with a scaloped margin and well-marked sulcal notch.

Dimensions:
Holotype: overall length (apex lacking) 55 µm, breadth 64 µm, shell length 48 µm, breadth 56.5 µm.
Range: overall length (apices lacking) 55-57 µm, breadth 61-68 µm. shell length 48-55 µm, breadth 55-59 µm.