Moraxellaceae

Abstract Mo.ra.xel.la.ce'ae. N.L. fem. n . Moraxella , type genus of the family; suff. ‐aceae , ending to denote family ; N.L. fem. pl. n . Moraxellaceae , the family of Moraxella . Cells are rod shaped, coccoid, or coccal or may exhibit a characteristic multicellular micromorphology. Cells usually occur singly, in pairs, or in short chains. Gram‐stain‐negative. Aerobically or facultatively anaerobic. Endospores are not observed. The cells are not motile in liquid media, but surface‐bound motility may be observed. Capsules and fimbriae may be present. Chemoorganotrophic. Psychrophilic or mesophilic. Most members are catalase‐ and oxidase‐positive. The fatty acid profiles show the presence of mainly unbranched, saturated, and mono‐ or diunsaturated fatty acids with predominantly 16 and 18 carbon atoms. DNA G + C content ranges from 35 to 66 mol%. The family comprises the genera Moraxella , Acinetobacter , Psychrobacter , Enhydrobacter , Alkanindiges , Perlucidibaca , Paraperlucidibaca , Agitococcus , Faucicola , Fluviicoccus , Clavicella , and Aquirhabdus . Most members are considered saprophytes of little clinical significance, while a few species represent important infectious agents. DNA G + C content (mol%) : 35–66. Type genus : Moraxella Lwoff 1939 AL (Approved Lists 1980) emend. Henriksen and Bøvre 1968. Taxonomic and Nomenclature Notes According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the family Moraxellaceae is: correct name (last update, February 2025) * . LPSN classification: Bacteria / Pseudomonadati / Pseudomonadota / Gammaproteobacteria / Pseudomonadales / Moraxellaceae The family Moraxellaceae can also be recovered in the Genome Taxonomy Database (GTDB) as f__Moraxellaceae (version v220) ** . GTDB classification: d__Bacteria / p__Pseudomonadota / c__Gammaproteobacteria / o__Pseudomonadales / f__Moraxellaceae * Meier‐Kolthoff et al. ( 2022 ). Nucleic Acids Res , 50 , D801 – D807 ; DOI: 10.1093/nar/gkab902 ** Parks et al. ( 2022 ). Nucleic Acids Res , 50 , D785 – D794 ; DOI: 10.1093/nar/gkab776