Table 1. Sample sites, latitude, longitude, location code, sample size (N), sequence diversity (h), standarized sequence diversity (Hk) and number of kind sequences in each population of O. similis, O. nana and O. atlantica collected for this study from the Atlantic Ocean.

Species	Sample site	Latitude	Longitude	Location Code	N	h	Hk
O. similis	Gulf of Maine, US	43°10′4.8″N	70°25′4.8″W	GM	19	0.51	0.52
	Bay of Biscay, Spain	43°42′N	6° 9′W	BB	16	0.24	0.24
	Iceland	64°20.15′N	27°W	IC	20	0.68	0.72
	Mid Atlantic Bight, US	38°16.3′N	74°24.4′W	MAB	21	0.74	0.72
	Península Valdés, Argentina	42°31′4.8″S	63°12′W	PV	18	0.81	0.82
	Bahía Grande, Argentina	51°S	67°W	BG	11	0.34	0.35
	Río de la Plata, Argentina	36°4′48″S	54°32′2.4″W	RdP	1	N/A	N/A
	Helgoland Sea, Germany*	54°10′57″N	7°53′E	HE	1	N/A	N/A
	Torres, Brazil	29°40′4.8″S	49°30′W	BR	1	N/A	N/A
					108
O. nana	Mid Atlantic Bight, US	38°16.3′N	74°24.4′W	MAB	11	0.56	0.56
	El Rincón, Argentina	39°38′2.4″S	61°6′3.6″W	6AR	3	0.00	0.00
	Península Valdés, Argentina	42°31′4.8″S	63°12′W	PV	4	0.50	0.50
	Gulf of Naples, Italy*	40°50′N	14°15′E	NAP	1	N/A	N/A
					19
O. atlantica	Bay of Biscay, Spain	43°42′N	6° 9′W	BB	2	1.00	1.00
	Mid Atlantic Bight, US	38°16.3′N	74°24.4′W	MAB	12	0.41	0.41
	Rio de la Plata, Argentina	36°4′48″S	54°32′2.4″W	RdP	4	0.00	0.00
	Argentina	45°15′S	62°30′3,6″W	7AR	2	0.00	0.00
	Argentina	43°31′4.8″S	61°23′2.4″W	8AR	3	0.00	0.00
					23

Total sample size for each species is indicated in bold, samples from type locality are indicated by asterisk. N/A: not applicable.