Prismatophyllum conjunctum (Davis) is a craspedophyllid coral that has the growth form of Prismatophyllum and an Eridophyllum-like internal wall (aulos). This mixture of the characters of two distinct genera is interpreted as convergence because the aulos is independently developed in several stocks of corals. Specimens of P. conjunctum are not common but are known from four widely scattered sequences in Kentucky, Ohio, Ontario, and New York. These occurrences of approximately the same age, and other stratigraphic data, help resolve differing interpretations of the relationship of the central southwestern Ontario section to other Devonian sequences in eastern North America.

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