Characteristic		Motility	NaCl range (M)	NaCl optimum (M)	Cell stability (M NaCl)		Temp range (°C)	Temp optimum (°C)	Optimum pH			Anaerobic nitrate reduction	Indole production	H2S formation from thiosulfate	Hydrolysis of Gelatin	Hydrolysis of Casein	Hydrolysis of Starch	Hydrolysis of Tween 80					Rifampicin Resistant		DNA G+C content (mol%)	DNA-DNA hybridization values
																										
																										
H. mediterranei		+	1.3-4.7	2.9	0.5		20-55	40	6.5			+	+	-	+	+	+	+					-		59.1-62.2	4
H. volcanii		-	1.0-4.5	2.5-4.3	0.5		ND	40	7			-	+	+	-	-	-	-					-		63.4	21
H. denitrificans		-	1.5-4.5	2.0-3.0	1.5		30-55	50	6.0-7.0			+	-	+	+	-	-	-					-		64.2	1
H. gibbonsii		-	1.5-5.2	2.5-4.3	0.5-0.7		25-55	35-40	6.5-7.0			-	+	+	+	+	-	+					-		61.8	24