Batiacasphaera ringnesiorum, (Manum and Cookson, 1964), Dörhöfer and Davies, 1980

Now Kallosphaeridium?. Originally Canningia, subsequently Canningia?, thirdly Batiacasphaera, fourthly Chytroeisphaeridia, fifthly (and now) Kallosphaeridium?.
Lentin and Williams, 1981 retained this species in Canningia.

Holotype: Manum and Cookson, 1964, pl.2, fig.10
Locus typicus: Ellef Ringnes Island, Arctic Canada
Stratum typicum: Campanian-Maastrichtian

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Original description as Canningia ringnesiorum: [Manum and Cookson, 1964, p. 15-16]:

Description:
Shell almost circular, sometimes slightly broader than long, with or without a slight apical projection.
Archeopyle apical, formed by the rupture of the shell along a more or less straight line a short distance behind the apex, sometimes small V-shaped notches can be observed along the edge.
Wall thin, in surface view with a finely dotted pattern, in optical section the ornament is seen to be composed of somewhat club-shaped elements c. 1.0 µm long.

Dimensions:
Holotype: 92 µm long, 93 µm broad.
Range: 64-102 µm long, 57-100 µm broad.