Table 2. Taxa proposed as elevated/reduced in ADHD.

Phylum	Class	Order	Family	Genus	Species
Actinobacteria	Actinobacteria	Bifidobacteriales	Bifidobacteriaceae	Bifidobacterium[65], [66]
	Coriobacteria	Coriobacteriales	Coriobacteriaceae	Eggerthella [66]
Fusobacteria	Fusobacteria	Fusobacteriales	Fusobacteriaceae	Fusobacterium [60]
Firmicutes	Clostridia	Clostridiales [66, 67]	Lachnospiraceae [68]	Ruminococcus	R. gnavus [68]
				Coprococcus [63]	C. eutactus [66]
				Lachnoclostridium [61]
			Ruminococcaceae [68]	Faecalibacterium [61, 68]	F. prausnitzii [68]
			Clostridiaceae	Intestinibacter [63]
			Catabacteriaceae [59]
			Veillonellaceae [68]	Veillonella	V. parvula [68]
				Dialister [61]
			Peptostreptococcaceae [61]
			Peptococcaceae [61]
	Bacilli	Lactobacillales	Lactobacillaceae	Lactobacillus [60]
			Enterococcaceae [68]	Enterococcus [68]
Bacteroidetes	Bacteroidia	Bacteroidales	Porphyromonadaceae [59, 66]
			Prevotellaceae [59]	Prevotella [59, 63]
				Paraprevotella	P. xylaniphila [68]
			Odoribacteriaceae [68]	Odoribacter [68]	O. splanchicus [68]
			Rikenellaceae [66]
			Bacteroidaceae [59]	Bacteroides [59, 65]	B. uniformis [60]
					B. ovatus [60]
					B. caccae [68]
					B. coprocola [60]
				Parabacteroides [59]
Proteobacteria	Betaproteobacteria	Neisseriales	Neisseriaceae [59]	Neisseria [59]
		Burkholderiales	Sutterellaceae	Sutterella	S. stercoricanis [60]
			Alcaligenaceae [61]
	Deltaproteobacteria	Desulfovibriales	Desulfovibrionaceae	Desulfovibrio [67]
	Gammaproteobacteria	Pseudomondales	Moraxellaceae [61]
		Xanthomonadales	Xanthomonadaceae [61]

Taxa that have been proposed as elevated in Control (orange) and ADHD (purple). Taxa labelled grey with bold text had conflicting results over multiple studies. Taxa in bold and italics had mixed results over member sub-classifications (in normal italics).