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Strain SIT6 T was isolated from the fecal flora of a severely malnourished child as part of a broad "culturomics" study aiming to maximize the culture conditions for the in-depth exploration of the human microbiota. An analysis of the 16S rRNA gene sequence showed that strain SIT6 T shared 94.1% 16S rRNA gene sequence similarity with Bacillus thermoamylovorans DKP T (NR_029151), the phylogenetically closest type species. Colonies are creamy white, circular, 4-5 mm in diameter after cultivation at 37°C for 24 hr on 5% sheep blood-enriched Colombia agar. Growth occurs at temperatures in the range of 25-56°C (optimally at 37°C). Strain SIT6 T is a gram-positive, facultative anaerobic rod and motile by means of peritrichous flagella and sporulating; it is catalase and oxidase positive. The 2,784,637-bp-long genome, composed of 16 contigs, has a G+C content of 35.19%. Of the 2,646 predicted genes, 2,572 were protein-coding genes and 74 were RNAs. The major fatty acids are saturated species (15:0 iso, 16:0 and 17:0 anteiso). Of the 14 detected fatty acids, 11 are saturated, either linear or branched (iso and anteiso). Digital DNA-DNA hybridization (dDDH) estimation and average genomic identity of orthologous gene sequences (AGIOS) of the strain SIT6 T against genomes of the type strains of related species ranged between 18.6% and 38.3% and between 54.77% and 65.50%, respectively. According to our taxonogenomics results, we propose the creation of Bacillus kwashiorkori sp. nov. that contains the type strain SIT6 T (=CSUR P2452 T , =DSM 29059 T )., (© 2017 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.)