J. Gen. Appl. Microbiol., 51, 65–71 (2005)

The genus Pseudomonas has been reported to be a genetically and metabolically diverse bacterial group (Anzai et al., 2000; Kersters et al., 1996; Moore et al., 1996). Pseudomonas species of the rRNA-DNA similarity group I have been previously stated by Palleroni (1984) to form the genus Pseudomonas (sensu stricto) within the g subclass of the Proteobacteria. The formerly Pseudomonas species of the remaining four rRNA similarity groups (Palleroni, 1984) have been transferred into the other genera or formed the new taxa (Kersters et al., 1996). Among authentic Pseudomonas species P. stutzeri, formerly P. perfectomarina (Baumann et al., 1983; Rosselló-Mora et al., 1993), P. alcaligenes, P. pseudoalcaligenes (Palleroni, 1984), P. alcaliphila (Yumoto et al., 2001), and P. balearica (Bennasar et al., 1996) have been recovered from marine environments, mainly from seawater or sediment. Pseudomonas or Pseudomonas-like bacPseudomonas xanthomarina sp. nov., a novel bacterium isolated from marine ascidian