A novel Gram-stain-positive, rod shaped and anaerobic bacterium, designated as W6T, was isolated from Shengli oilfield in China. Strain W6T was observed to grow from 20 to 45 °C with pH 6.5–9.0 (optimally at 40 °C and pH of 7.5) and without addition of NaCl. The major cellular fatty acids were iso-C15 : 0 (29.1%), C14 : 0 (27.0%) and C16 : 0 (12.2%), and the main polar lipids were lipids (L) and aminolipids (AL). The DNA G+C content is 42.9 mol%. Based on 16S rRNA gene sequence analysis, strain W6T showed highest similarities to
Tissierella creatinini
DSM 9508T (94.9%) and
Soehngenia saccharolytica
DSM 12858T (94.1%). The morphological, physiological, biochemical, phylogenetic and phylogenomic analyses demonstrated strain W6T (CCAM 534T=DSM 28124T=CGMCC 1.5291T) represents a novel species in a new genus, for which the name Gudongella oleilytica gen. nov. sp. nov. is proposed. The family
Tissierellaceae
is proposed as a new family containing the genera
Anaerosalibacter
, Gudongella,
Keratinibaculum
,
Soehngenia
,
Sporanaerobacter
,
Tepidimicrobium
,
Tissierella
, Urmitella and species
Clostridium ultunense
based on the phylogenetic and phylogenomic analyses.