Description of Algoriphagus taiwanensis sp nov., a xylanolytic bacterium isolated from surface seawater, and emended descriptions of Algoriphagus mannitolivorans, Algoriphagus olei, Algoriphagus aquatilis and Algoriphagus ratkowskyi

A novel, Gram-stain negative, strictly aerobic, oval or rod-shaped, red-pigmented, non-sporeforming xylanolytic bacterial strain, designated CC-PR-82(T), was isolated from surface seawater of Pingtung coast, Taiwan, and characterized by polyphasic taxonomy. Strain CC-PR-82(T) shared highest pairwise 16S rRNA gene sequence similarity to Algoriphagus mannitolivorans IMSNU 14012(T) (97.0 %) followed by 'A. boseongensis' BS-R1(T) (96.5 %) and A. olei CC-Hsuan-617(T) (95.6 %), whereas other (n = 26) Algoriphapus species shared 95.6-92.6 % sequence similarities. The novel strain further established a distinct phyletic lineage tightly associated withAlgoriphagus species. The DNA-DNA hybridization value obtained between CC-PR-82(T) and A. mannitolivorans DSM 15301(T) was 29.0 % (33.4 % reciprocal using A. mannitolivorans DSM 15301(T) probe). The major ([5 % of total) fatty acids were identified as iso-C-15:0, C-16:1 omega 6c and/or C-16:1 omega 7c, iso-C-16:0, iso-C-17:1 omega 9c and/or C-16:0 10-methyl, anteiso-C-15:0 and C-17:1 omega 6c. Polar lipids includedmajor amounts of an unidentified aminolipid and an unidentified lipid; moderate amounts of phosphatidylethanolamine, phosphatidylserine and an unidentified aminolipid; trace amounts of an unidentified phospholipid, an unidentified lipid and an unidentified glycolipid. The DNA G+C contentwas determined to be 42.3 mol%. Menaquinone-7 was the sole respiratory quinone. Based on the polyphasic characteristics, that are in line with those of Algoriphagus species, in addition to distinguishing phylogenetic and phenotypic features, strain CC-PR-82(T) appears to represent a novel species of the genus Algoriphagus, for which the name Algoriphagus taiwanensis sp. nov. (type strain CC-PR-82(T) = JCM19755(T) = BCRC 80746(T)) is proposed. In addition, emended descriptions of the species A. mannitolivorans, A. aquatilis, A. olei and A. ratkowskyi are also proposed.