Table 1 Nitrogen processing metabolic potential of Lucinid symbiont species.

	Sedimenticola	Ca. Thiodiazotropha												Thiohalomonadales
Feature	endophacoides	Myrt1	Taylori	Lotti	weberae	Ctena1	Ctena2	Ctena3	endolucinida	Leuco2	Aeq1	Lucinoma1	gloverae	Thiohalo2	Thiohalo4
Diazotrophy, nitrogenase			+	+	+	+	+	+	+*					+
Respiratory nitrate reductase									+	+	+	+	+
Periplasmic nitrate reductase	+	+	+	+	+	+	+	+	+	+		+	+	+	+
Assimilatory nitrate reductase			+	+	+	+	+	+	+					+	+
Nitrite reductase NADPH subunit		+	+	+	+	+	+	+	+	+		+	+	+	+
Copper-containing nitrite reductase (NO-forming)		+		+		+	+	+	+	+		+	+	+	+
Nitric oxide reductase	+	+	+	+	+	+		+	+	+			+	+	+
Nitrous-oxide reductase	+	+	+	+	+	+	+	+	+	+		+	+	+	+
Cyanate hydratase						+	+	+	+	+		+	+
Urea metabolism	+		+		+
Allophonate utilization			+	+	+
Ammonia assimilation	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+

Only lucinid symbiont species groups (Sedimenticola, Ca. Thiodiazotropha, and Thiohalomonadales) with three or more MAGs are shown. Smaller group information can be found in Tables S5 and S7.
+ gene(s) within a pathway are present in all the high-quality MAGs; -, gene(s) within the pathway were absent from all the high-quality MAGs.
* Genes are present in a majority of the MAGs but not all.
** Genes are not present in MAGs but predicted proteins from the unbinned metagenomes were found with the same function and a taxonomy within the same Order as the MAG.

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