It was shown recently that TetradiumDana, 1846 (type species: Tetradium fibratumSafford, 1856), a common Middle and Upper Ordovician fossil, is a calcareous filamentous florideophyte alga (Phylum Rhodophyta) (Steele-Petrovich, 2009a, 2009b), and not a tabulate coral or a chaetetid sponge, as traditionally classified. Reassigning Tetradium Dana from an animal to an alga subjects it to the International Code of Botanical Nomenclature (ICBN) (McNeill et al., 2006), which makes it a later homonym of TetradiumLoureiro, 1790 (see Farr et al., 1979), a Recent tree of the citrus family (Rutaceae). According to the...

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