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The Genus Paracoccus


At the time that Henk van Verseveld and Adriaan Stouthamer (1991) described Paracoccus in the second edition of [{}The Prokaryotes], only two species were recognized: the type species (P. denitrificans) and P. halodenitrificans (Kocur, 1984). Of those two, Paracoccus halodenitrificans was subsequently excluded because it was shown to be a member of the genus Halomonas in the γ-subclass of the Proteobacteria (Dobson and Franzmann, 1996; Miller et al., 1994; Ohara et al., 1990; Urakami et al., 1990). In the past decade, a number of new species of Paracoccus have been described and a major critical review of the diverse biotypes of P. denitrificans and similar organisms was undertaken, leading to a clearer definition of the type species. At the time of writing, a total of 14 species of Paracoccus have been proposed (Table1). These include two well-studied species of facultatively chemolithoautotrophic sulfur bacteria, Thiosphaera