Electrophoretic surveys of 13 enzyme-coding loci distinguished unambig
uously five morphologically defined species of Porites and two species
of Goniopora. Each species was identifiable solely by unique, qualita
tive banding patterns at 1-6 loci. Genetic distances give preliminary
estimates that these Porites species diverged from common ancestors 8-
22 Ma during the Miocene, and that the two Goniopora species diverged
about 3.5 Ma in the Pliocene, assuming Porites evolved from Goniopora
55 million years ago (Ma).