Isastraea

Scleractinian coral Middle Jurassic-Cretaceous

A massive, colonial coral with a cerioid corallum. This was a reef-dwelling coral, with a strong construction analogous to hexagonal close packing. It would have thrived in high energy zones of low sedimentation rate. Feeding efficiency may have been compromised by the lack of space between polyps. Individual polyps were 4-7 mm in diameter.

Lithostrotion

Rugose coral Carboniferous

The corallites are typically less than 1 cm in diameter. A small, central, bar-like columella is developed and there is a pronounced edge zone composed of dissepiments. Overall, colonies can exceed 1 m across.

This coral genus shows a great deal of environmentally determined variation. Corallites within the colony may be separated from one another, a form known as fasciculate. However, they may also be in close contact with one another, with the shape of the corallites modified accordingly.

Thecosmilia

Scleractinian coral Middle Jurassic-Cretaceous

A colonial form characteristically composed of a few large corallites, perhaps 10 in a colony, each with a diameter of 2-3 cm. The corallite form is similar to that of Montlivaltia (right). The corallum shape is fasciculate, and the corallites usually branch one from another.

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