Alterbia macrocysta, (Cookson and Eisenack, 1960), Lentin and Williams, 1976

Combination illegitimate: the generic name Alterbia is illegitimate.

Holotype: Cookson and Eisenack, 1960, pl.1, fig.7
Locus typicus: Carnavron Basin, W. Australia
Stratum typicum: Campanian

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Original description as Deflandrea macrocysta: [Cookson and Eisenack, 1960, p. 3]:

Description:
Shell almost entirely filled with a large sphaeroidal to ovoidal capsule; shell membrane thin and delicate, usually only evident at or near the apex, where it forms a triangular horn, and at the antapex, where it extends beyond the capsule as a flat expansion (often destroyed) in which occasionally there are indications of two antapical projections. A broad, shallow girdle divides the shell unequally, the epitheca being appreciably larger than the hypotheca. The wall of the capsule is rather thick and coarsely and densely granular. A pylome has not been observed.

Dimensions:
Holotype: 94 µm long; 67 µm broad.
Range: 80-109x55-70 µm.