Table 2 Table with the main metabolic pathways of the MAGS Ca. Thiodiazotropha sp. (L. capensis), Ca. T. taylori, Ca. T. endolucinida, Ca. T. weberae, Ca. T. lotti.

Feature	Ca. Thiodiazotropha sp. (L. capensis)	Ca. T. taylori	Ca. T. endolucinida	Ca. T. weberae	Ca. T. lotti
Carbon metabolism
CBB cycle, form I (RuBisCO)	+	+	+	+	+
CBB cycle, form II (RuBisCO)	+	−	+	−	−
Methylotrophy pathway	+	+	+	−	−
Nitrogen metabolism
Diazotrophy (nif cluster)	−	+	+	+	+
Respiratory nitrate reductase (nar)	+	−	+	−	−
Periplasmic nitrate reductase (nap)	+	+	+	+	+
Copper-containing nitrite reductase (NO-forming)	+	− **	+	−	+
Nitrite reductase NADPH subunit	+	+	+	+	+
Nitric-oxide reductase	+	+	+	+	+
Nitrous-oxide reductase	+	+	+	+	+
Urea metabolism	−	+	−	+	−
Ammonium assimilation	+	+	+	+	+
Sulfur metabolism
Sqr	+	+	+	+	+
Truncated SOX	+	+	+	+	+
DSR	+	+	+	+	+
DsrMKJOP complex	+	+	+	+	+
APR	+	+	+	+	+
FCC	+	+	+	+	+

Metagenomic data for all shallow-water lucinid symbionts reproduced from Osvatic et al.¹³.
+Gene(s) within the pathway were present in all the high-quality MAGs.
−Gene(s) within the pathway were absent from all the high-quality MAGs.
** These genes were only present in the high-quality MAGs of Ca. T. taylori associated with Stewartia floridana, from Florida, USA¹³.

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