Metalysinibacillus

Metalysinibacillus is a genus of Gram-positive rod-shaped bacteria in the family Caryophanaceae from the order Caryophanales. The type species of this genus is Metalysinibacillus jejuensis.

Members of Metalysinibacillus are previously species belonging to Lysinibacillus. Instead of branching with species from Lysinibacillus, these two species formed a monophyletic branch in various phylogenetic trees constructed based on conserved genome sequences, indicating their phylogenetic relatedness. The family Caryophanaceae encompassed many branching anomalies such as this one, partially due to the reliance on 16S rRNA sequences as a method for classification, which is known to have low resolution power and give differing results depending on the algorithm used. In 2020, a comparative genomic study emended the family, resulting in the establishment of three new genera, including Metalysinibacillus.

The name Metalysinibacillus is derived from the Greek adjective meta, translating into "besides" and the Latin term Lysinibacillus, referring the genus name. Together, Metalysinibacillus can be translated as a genus besides Lysinibacillus.