Cleistosphaeridium heteracanthum, (Deflandre and Cookson, 1955), Davey et al., 1966

NOW Heterosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly (and now) Heterosphaeridium, fifthly Heterosphaeridium?.

Holotype: Deflandre and Cookson, 1955, pl.2, fig.5
Locus typicus: Victoria, Australia
Stratum typicum: ?Late Cretaceous-Early Eocene

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Original description as Hystrichosphaeridium heteracanthum: [Deflandre and Cookson, 1955, p. 276]:

Description:
Shell large, approximately circular in outline, with numerous appandages of variable size, shape and form. Appandages solid, usually elongated, frequently filiform, sometimes as broad as long, the apices either pointed, averted, or irregularly branched.
Surface of shell punctate.

Dimensions:
Shell 56-107 µm, appandages 5-36 µm long (majority between 13 and 23 µm).