Siphonobacter intestinalis sp. nov., a bacterium isolated from the feces of Pseudorhynchus japonicus.

Strain 63MJ-2 was isolated from the feces of broad-winged katydid (Pseudorhynchus japonicus) collected in Korea. The 16S rRNA gene sequence of this strain showed the highest sequence similarity with that of Siphonobacter aquaeclarae P2 (96.1%) and had low similarities (below 86.3%) with those of other members of family 'Flexibacteraceae'. The strain 63MJ-2 is a strictly aerobic, Gram-stain-negative, non-motile, rod-shaped bacterium. The strain grew at 4-35°C (optimum, 25-30°C), pH of 5.0-9.0 (optimum, 6.0-7.0), and 0-2.0% (optimum, 1.0-2.0) (w/v) NaCl. The DNA G+C content of strain 63MJ-2 was 43.5 mol%. The major fatty acids were C ω5c (42.5%), iso-C 3-OH (18.7%), and summed feature 3 (iso-C 2-OH and/or C ω7c, 18.0%). The major menaquinone was MK-7 and polar lipids were phosphatidylethanolamine, six unknown aminolipids, and five unknown lipids. Based on the evidence from our polyphasic taxonomic study, we conclude that strain 63MJ-2 should be classified as a novel species of the genus Siphonobacter, and propose the name Siphonobacter intestinalis sp. nov. The type strain is 63MJ-2 (=KACC 18663 =NBRC 111883).