This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
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J. J. Sepkoski, Jr., 2002 - A compendium of fossil marine animal genera - Bulletins of American Paleontology (363), 1-560 (serial monograph, English)
R. A. McLean, 1987 - Frasnian rugose corals of western Canada, part 2: The genus Smithiphyllum - Palaeontographica Abteilung A (195), 131-173 (journal article, English)