Table 1 Summary of gene families horizontally transferred into centipede venoms.

Gene	HGT source	Number of HGT events^a	Phylogenetic location of HGT	Phylogenetic location of recruitment into venom	Mapped to Strigamia maritima genome^b
β-PFTx	Bacteria	2 (1)	Arthropoda or Chilopoda; within Lithobiomorpha	Chilopoda	SMAR004242, SMAR004243, SMAR012417
centiPAD	Bacteria	2	Within Scutigeromorpha; within Lithobiomorpha	Within Scutigeromorpha; within Lithobiomorpha	n/a
DUF3472	Bacteria	1 or 2 (1)	In the stem of Pleurostigmophora or Amalpighiata^c; or in Epimorpha and within Lithobiomorpha	Within Scolopendromorpha	SMAR002991, SMAR002992, SMAR002993, SMAR008653
GEOTX02	Fungi^d	1 or 2	Geophilomorpha	Geophilomorpha	(group 1: SMAR012843, SMAR003678, SMAR004759); (group 2: SMAR012429, SMAR005429); group 3: SMAR014279; (group 4: SMAR009615, SMAR004692, SMAR001285, SMAR007268, SMAR006394, SMAR009617, SMAR010233)
PCPDP-like	Bacteria	1	Lithobiomorpha	Lithobiomorpha	n/a
unchar05	Fungi	2	Geophilomorpha, within Lithobiomorpha	Geophilomorpha	SMAR002275, SMAR004333, SMAR005016, SMAR002277, SMAR015613
unchar16	Oomycetes^d	1	Unknown	Craterostigmomorpha	SMAR001399, SMAR001400

n/a The absence of these genes from the genome of S. maritima is uninformative because the HGT events happened elsewhere in the tree.
^aThe number in parentheses shows the number of times the gene was recruited into the venom proteome if that differs from the number of HGT events²³.
^bThe identity of all paralogous loci is given. All are protein-coding loci with introns. Different paralog groups are indicated in parentheses.
^cDue to uncertainty about centipede phylogeny⁵² we cannot distinguish between a single HGT into Pleurostigmophora (non-scutigeromorph centipedes), followed by a loss in Craterostigmomorpha, or a HGT into Amalpighiata (Lithobiomorpha + Epimorpha). Both these hypotheses suggest a loss in henicopid lithobiomorphs.
^dThe direction of transfer is ambiguous.

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