Table 2. A comparison of non-coding regions (NCR) within the six mt genomes.
| Largest NCR | ||||||
| Species | No. of NCR | Total lenth (bp) | Proportion of themt genome (%) | Lenth (bp) | A+T % | Location |
| Moerella iridescens | 23 | 1604 | 9.55 | 1200 | 70.00 | rrnS - trnM |
| Sanguinolaria diphos | 16 | 1022 | 6.25 | 674 | 70.77 | rrnS - trnM |
| Sanguinolaria olivacea | 16 | 2730 | 15.01 | 2272 | 69.67 | trnG - trnI |
| Semele scaba | 23 | 1567 | 9.15 | 1166 | 58.92 | cob - trnG |
| Sinonovacula constricta | 25 | 2134 | 12.39 | 1492 | 66.89 | nad2 - trnK |
| Solecurtus divaricatus | 22 | 1160 | 6.93 | 775 | 65.81 | rrnS - trnM |