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

Combination illegitimate: the generic name Alterbia is illegitimate.

Holotype: Eisenack and Cookson, 1960, pl.1, fig.3
Locus typicus: Wapet"s Rough Range South No.1 Bore, Western Australia
Stratum typicum: Turonian

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Original description as Deflandrea foliacea: [Eisenack and Cookson, 1960, p. 2]:

Description:
Shell flat, broadly oval in outline, divided almost equally by a rather broad shallow girdle and narrowing towards a short blunt apical projection and one or occasionally two slight antapical prominences. A short, broad longitudinal furrow is developed on the central surface of the hypotheca. The capsule is approximately circular in outline and does not fill the shell laterally. A pylome has not bee observed. Shell-membrane thin, transparent, wall of capsule slightly granular.

Dimensions:
Type: 57 µm long, 48 µm broad.
Range: 53-67 µm long, 43-52 µm broad.

Affinities:
This species closely resembles D. rotundata but differs from it in the shape of the epitheca.