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Lower Middle Devonian Stromatoporoidea from Empire Beach, southern Ontario, Canada

Seven species belonging to three stromatoporoid genera are described from two localities at Empire Beach, southern Ontario. Stromatoporella is the most diverse genus, to which five species are assigned. The most common species is Syringodictyon tuberculatum (Nicholson), represented by ten of the twenty-four collected specimens. One genus, Syringodictyon, and one species, Stromatoporella megastrorhizifera, are new. Stromatoporella cf. S. composita Yavorsky is unassigned. The species range in age from Emsian, or possibly Siegenian, to Frasnian. They correlate well with stromatoporoids described from strata equivalent to the lower Detroit River Group, Edgecliff Member (Onondaga Formation), as well as with the Couvinian–Eifelian horizons of Europe.