The taxonomy of the bacteria symbiotically associated with the insect-pathogenic nematodes and was examined. The bacteria studied were isolated from 33 populations obtained from Australasia, Europe, and the United States. The symbionts of all species of and examined were members of the genus , but they differed in several respects from the description of the genus , including the guanine-plus-cytosine content of the deoxyriboneucleic acid and the production of acid from carbohydrates. All bacteria isolated from spp. were identified as members of . The bacteria isolated from one species were similar and were distinguishable from the bacteria isolated from other Neoaplectana species. The following three subspecies of are proposed: subsp. (bacteria symbiotic with [= ]; type strain ATCC 19061), subsp. (bacteria symbiotic with ; type strain, UQM 2210), and subsp. (bacteria symbiotic with ; type strain, UQM 2216). These subspecies vary in host nematode, pigmentation, maximum temperature for growth, responses to tests for phenylalanine deaminase by secondary-form isolates and for lipase (Tween 80 test) and lecithinase by primary-form isolates, and coloration of primary-form isolates on MacConkey agar and media containing bromthymol blue.


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