Aulopora macrostoma (Fischer)
Click on pictures to magnify
This very attractive specimen shows the basal (underside) surface of the
colony, where it attached to an object and shows a semi-regular branching
pattern of the corallites.
The yellowish and orange color is from small amounts of iron oxides staining
the rock and fossil. Look closely at the orange masses in the coral skeleton;
they are small concretionary growths of silica that have replaced the calcite
skeleton, in the growth form known as beekite rings. Beekite rings form as
a series of layers (shells) around a center point. When they occur in a thin
skeleton like this, they are seen as a small disk with concentric ridges. It is
a very distinctive feature. In the enlarged photo, it is possible to see white
colored rings in the skeleton that are uncolored beekite rings.
Phylum Cnidaria (corals)
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