Palaeoaplysina is a genus of tabular, calcified fossils that are a component of many Late Palaeozoic reefs.

Historically interpreted as a sponge or hydrozoan,[2] recent studies are converging to its classification in the coralline stem group, placing it among the red algae.

[3] The organism is widespread in the tropical and near-tropical margin of the Laurentian continent (45–15°N), but is not found elsewhere.

[3] It acts as an important reservoir rock for oil deposits.

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