Table 1. MAGs described in this study and their main potential metabolic features.

Classification				MAGs	Metabolic potentials	Database source
Superphylum	Phylum	Class	Order or family
Euryarchaeota	Methanobacteriota	Thermococci	Ca. Nuwarchaeales	6	CH3-reducing methanogen	Present study, PRJNA357337, and Nayfach et al. (23)
	Thermoplasmatota	Thermoplasmata	Methanomassiliicoccales	1	CH3-reducing methanogen or C2H6 metabolism	PRJNA443587 and Reiss et al. (75)
	Halobacteriota	Ca. Methanoliparia	Ca. Methanoliparales	1	CO2-reducing methanogen with CnH2n+2 metabolism	Nayfach et al. (23)
		Archaeoglobi	Archaeoglobales	4	CO2-reducing methanogen or CH4 oxidation	Present study & Nayfach et al. (23)
			Ca. Polytropaceales	1	CnH2n+2 oxidation	Nayfach et al. (23)
		Methanosarcinia	Ca. Ethanoperedenaceae	1	C2H6 oxidation	Nayfach et al. (23)
		Ca. Syntropharchaeia	Ca. Santabarbaracales	1	CnH2n+2 oxidation (n > 2)	Hawley et al. (31, 32) and Nayfach et al. (23)
			Ca. Alkanophagales	1		Dombrowski et al. (30)
	Ca. Hadarchaeota	Ca. Hadarchaeia	Ca. Hadarchaeales	3	CnH2n+2 oxidation	Nayfach et al. (23)
TACK	Thermoproteota	Ca. Nezhaarchaeia	Ca. Nezhaarchaeales	5	CO2-reducing methanogen	Present study, Nayfach et al. (23), and Dombrowski et al. (30)
		Ca. Methanomethylicia	Ca. Methanomethylicales	30	CH3-reducing methanogen or C2H6 metabolism	Present study and Nayfach et al. (23)
		Ca. Korarchaeia	Ca. Korarchaeales	1	CH3-reducing methanogen	Nayfach et al. (23)
Asgard	Asgardarchaeota	Ca. Lokiarchaeia	Ca. Helarchaeales	4	CnH2n+2 oxidation	Present study