Tessaracoccus Coleopterorum Sp. Nov., Isolated From The Intestine Of The Dark Diving Beetle, Hydrophilus Acuminatus

A polyphasic taxonomic approach was used to characterize a novel bacterium, designated as strain HDW20(T), isolated from the intestine of the dark diving beetle Hydrophilus acuminatus. The isolate was Gram- stain-positive, facultatively anaerobic, non-motile, coccus-shaped, and formed pale orange colonies. Phylogenetic analysis based on 16S rRNA gene sequences and genome sequences showed that the isolate belonged to the genus Tessaracoccus in the phylum Actinobacteria and was closely related to T. flavescens SST-39(T), T. defluvii JCM 17540(T), and T. aquimaris NSG39(T), with the highest 16S rRNA gene sequence similarity of 98.5 % and a highest average nucleotide identity (ANI) value of 80.6 %. The major cellular fatty acids were C-18:1 omega 9c and anteiso-C-15:0. The main respiratory quinone was MK-9 (H-4). The major polar lipid components were phosphatidylglycerol and diphosphatidylglycerol. The genomic DNA G+C content was 69.0 %. The isolate contains LL-diaminopimelic acid, L-alanine, and L-lysine as amino acid components, and ribose, glucose, and galactose as sugar components of the cell wall peptidoglycan. The results of phylogenetic, phenotypic, chemotaxonomic, and genotypic analyses suggested that strain HDW20(T) represents a novel species within the genus Tessaracoccus. We propose the name Tessaracoccus coleopterorum sp. nov. The type strain is HDW20(T) (=KACC 21348(T)=KCTC 49324(T)=JCM 33674(T)).