Psychroserpens luteolus sp. nov., isolated from Gelidium, reclassification of Ichthyenterobacterium magnum as Psychroserpens magnus comb. nov., Flavihalobacter algicola as Psychroserpens algicola comb. nov., Arcticiflavibacter luteus as Psychroserpens luteus comb. nov

Abstract

A Gram-stain-negative, motile by gliding, catalase positive, facultative anaerobic strain, designated strain XSD401^T, was isolated from an unidentified Gelidium species of Xiaoshi Island, Shandong Province, China. The 16S rRNA gene sequence comparisons indicated strain XSD401^T had a sequence similarity of 96.9% with Psychroserpens damuponensis KCTC 23539^T and 96.3% with Psychroserpens burtonensis DSM 12212^T. The G + C content of the genomic DNA was 33.9%. The ANI values between strain XSD401^T and P. damuponensis KCTC 23539^T, P. burtonensis DSM 12212^T, were 76.9% and 76.9%, respectively. The dDDH values between strain XSD401^T and P. damuponensis KCTC 23539^T, P. burtonensis DSM 12212^T, were 20.4% and 20.3%, respectively. The AAI values and POCP values of these 8 species were all over 72% and 50%. Combined with the results of comparative genomic analysis, Ichthyenterobacterium magnum, Flavihalobacter algicola and Arcticiflavibacter luteus were reclassified into Psychroserpens. Furthermore, the differences in morphology, physiology and genotype from the previously described taxa support the classification of strain XSD401^T as a representative of the genus Psychroserpens, for which the name Psychroserpens luteolus sp. nov. is proposed. The type strain is XSD401^T (= MCCC 1H00396^T = KCTC 72684^T = JCM 33931^T).

Keywords: Draft genome sequencing; Novel species; Prokaryotic taxonomy; Psychroserpens luteolus.