Table 1. List of Ceriantharia species included in the present study.

Family	Organism	Obtained sequences	GENBANK-DDBJ/BOLD Number
Arachnactidae	Isarachnanthus bandanensis	16S/COI	16S - (JX125699) COI - (CMBIA097-11(BOLD))
	Isarachnanthus maderensis	16S/COI/18S	16S - (JX125670–72/79–80/82/85–87)/COI - (JX128313–14/22–23/25/28–33)/18S – AB859825
	Isarachnanthus nocturnus	16S/COI/28S/18S	16S - (JX125669/73–78/81/83–84/88–89/91–98)/COI - (JF915196–97/JX128315–21/24/26/27/34–42)/18S - AB859826/28S - AB859832
Cerianthidae	Ceriantheomorphe brasiliensis	16S/COI/18S/28S	16S - JF915193/COI - JF915195/18S – AB859823/28S – AB859831
	Ceriantheopsis americanus	16S/COI	16S – AB859834/COI – AB859839
	Cerianthus membranaceus	16S/COI/18S	16S – AB859837/COI – AB859843/18S – AB859824
	Cerianthus lloydii	16S/COI	16S – AB859838/COI AB859844
	Pachycerianthus sp.1	16S/COI/18S/28S	16S – AB859835/COI – AB859840/18S – AB859829/28S – AB859833
	Pachycerianthus borealis	16S	16S - U40288
	Pachycerianthus magnus	16S/COI/18S	16S – AB859836/COI – AB859841/18S – AB859828
	Pachycerianthus fimbriatus	COI/18S	COI – AB859842/18S –AB859827