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Horologinella biconvexa ssp. biconvexa

Horologinella biconvexa subsp. biconvexa.

Autonym.
NOW Tetrachacysta biconvexa subsp. biconvexa. Originally Horologinella biconvexa subsp. biconvexa, subsequently (and now) Tetrachacysta biconvexa subsp. biconvexa.

Holotype: Jiabo, 1978, pl.29, fig.21.
Age: Early Tertiary
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