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What you should know:

Bdellovibrio is a curved Gram-negative bacterium whose life cycle is predatory. Due to its flagella, Bdellovibrio rotates rapidly when contacting a prey cell, boring its way through the cell wall. It then reproduces in the space between plasma membrane and cell wall, eventually killing the cell. Its metabolism is chemoheterotrophic. Some bacteria have developed sheaths to defend against this predator.


Domain Bacteria

    Phylum Proteobacteria 

        Class d - Proteobacteria 

Bergey's Manual Volume 2: The Proteobacteria