A new genus, , is created to accommodate large, gram-negative, rod-shaped, facultatively anaerobic, entomopathogenic bacteria which are intimately associated with entomogenous nematodes. The normal habitat of these bacteria is the intestinal lumen of nematodes or the body cavity of host insects into which they have been introduced by the nematodes. The genus is placed in the family since the bacteria possess most of the important characteristics of this family. differs from other genera of in large cell size, failure to reduce nitrates to nitrites, intimate association with entomogenous nematodes, entomopathogenesis, and immunological characteristics. The type species is (Poinar and Thomas) comb. nov. (synonym: Poinar and Thomas). sp. nov., a bioluminescent, entomopathogenic bacterium isolated from the intestinal lumen of an entomogenous nematode, , is also described. In addition to their immunological differences, the two species are dissimilar in that is positive for bioluminescence and catalase activity, whereas is not. The type strain of is ATCC 19061, and that of is strain (= ATCC 29999).


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