Table 1.

Main structural features of the five mt genomes sequenced anew in this study. For each, total size of the mt genome, overall base composition, size and base composition of the potential origin of replication (POR), size of rRNAs, size of intergenic spacers, and size of the protein coding genes (showing start/stop codons within parentheses) are presented. Sizes are expressed as bp.

	P. dolabrata	A. fragilis	S. pectinata	O. celtica	M. myosotis
total size	13,856	14,745	14,065	14,150	14,246
% A	27.44	30.12	29.76	25.26	23.67
% T	35.97	36.93	37.06	34.06	31.35
% C	16.97	15.13	14.92	18.92	21.35
% G	19.6	17.82	18.26	21.77	23.63
% A+T	63.41	67.05	66,82	59.32	55.02
POR size	42	52	53	43	45
% A+T POR	83.33	86.54	73.58	76.74	60.00
l-rRNA	998	1,095	1,022	1,056	1,089
s-rRNA	695	738	693	708	712
Intergenic spacers	89	644	229	295	311
atp6	640 (ATG/T)	660 (ATA/TAA)	663 (TTG/TAG)	645 (TTG/TAG)	641 (ATA/TA)
atp8	163 (ATG/T)	156 (TTG/TAG)	149 (ATG/TA)	147 (ATG/TAA)	151 (ATG/T)
cob	1,111 (TTG/T)	1,122 (TTG/TAA)	1,113 (TTG/TAA)	1,122 (ATT/TAA)	1,110 (TTG/TAG)
cox1	1,525 (TTG/T)	1,530 (TTG/TAA)	1,528 (TTG/T)	1,527 (TTG/TAG)	1,527 (ATG/TAA)
cox2	649 (TTG/T)	684 (TTG/TAA)	665 (TTG/TA)	681 (TTG/TAA)	669 (GTG/TAA)
cox3	778 (ATG/T)	778 (ATG/T)	778 (ATG/T)	778 (ATG/T)	778 (ATG/T)
nad1	876 (ATT/TAA)	915 (TTG/TAG)	886 (TTG/T)	906 (TTG/TAA)	882 (ATT/TAG)
nad2	925 (ATT/T)	942 (ATA/TAA)	935 (TTG/TA)	922 (ATG/T)	948 (ATG/TAG)
nad3	351 (TTG/TAA)	354 (TTG/TAG)	350 (ATG/TA)	352 (ATG/T)	335 (ATA/T)
nad4	1,332 (TTG/TAA)	1,322 (TTG/TA)	1,328 (TTG/TAA)	1,308 (GTG/TAA)	1,305 (TTG/TAA)
nad4L	271 (ATA/T)	283 (ATG/T)	283 (GTG/T)	268 (ATG/T)	291 (TTG/TAA)
nad5	1,644 (ATA/TAG)	1,627 (GTG/T)	1,665 (TTG/TAG)	1,643 (GTG/TAG)	1,656 (GTG/TAG)
nad6	483 (ATT/TAG)	471 (TTG/TAA)	459 (TTG/TAA)	465 (TTG/TAA)	468 (ATA/TAG)