Legionella drancourtii
Legionella drancourtii is a Gram-negative bacterium from the genus "Legionella" which occurs in nature as a strictly intracellular parasite of free-living amoebae . 
<triplet> Gram-negative <subj> bacterium <obj> subclass of <triplet> Legionella <subj> Gram-negative <obj> Gram staining