Table 1.

Statistics on gene overlaps of ascidian mitochondrial genomes

	Gene overlap			Longest overlap
Speciesa	%	Total bp	N° (L ≥ 1)	bp	Gene pair
Phallusia mammillata	0.30	44	6	14	cox2-cob
Phallusia fumigata	0.15	23	3	14	cox2-cob; nad1-nad2
Ciona intestinalis sp. A	0.26	37	3	26	cox2-cob
Ciona intestinalis sp. B	0.25	38	3	29	cox2-cob
Ciona savignyi	0.22	33	3	26	cox2-cob
Halocynthia roretzi	0.23	34	4	13	nad4L-trnM(CAT)

^a Sequence AC numbers are reported in Additional file 2.