Chytroeisphaeridia pocockii, Sarjeant, 1968

Now Escharisphaeridia. Originally Chytroeisphaeridia, subsequently Lithodinia, thirdly (and now) Escharisphaeridia.

Holotype: Sarjeant, 1968, pl.3, fig.9; Eisenack and Kjellström, 1972, p.185; Davey, 1979d, pl.2, figs.7,10; Fensome et al., 1995, fig.1 - p.1673.
Locality and horizon: Marnes de Dives, foreshore exposure (L. lamberti Zone), Falaise des Vaches Noires, Villers-sur-Mer.
Age: Late Callovian

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Original description: [Sarjeant, 1968]:

Diagnosis:
A species of Chytroeisphaeridia characterised by the possession of a pronouncedly granular surface.

Dimensions:
Holotype: length (apex lacking) 45 µm, breadth 55 µm.
Range: length (apices lacking) 38-45 µm, breadth 50-55 µm.

Remarks:
Similar specimens, albeit somewhat larger, have been recorded from the upper part of the S. calloviense Zone (Lower Callovian) of Bavent, Normandy (Sarjeant, 1965); they have also been noted in Canadian Upper Jurassic assemblages by Stanley A.J. Pocock, in an unpublished report courteously communicated to the author.