Abstract
The two complete mitochondrial genomes were sequenced from the freshwater monogonont rotifer Brachionus angularis. The mitochondrial genome sequences were 10,764 bp (mitochondrial DNA I) and 12,238 bp (mitochondrial DNA II) in size, respectively. The gene structure and its orientation of 12 protein-coding genes (PCGs) of complete mitochondrial genomes of B. angularis was identical to those shown in other marine rotifers and the freshwater rotifer Brachionus rubens, but was different from the freshwater rotifer Brachionus calyciflorus. Of 12 PCGs, one gene (ND5) had incomplete stop codon. Furthermore, the start codon for CO1, ND4L, ND5, and CO2 was GTG, while the start codon for ND3 and other PCGs was ATA and ATG, respectively. The base composition of 12 PCGs in B. angularis mitogenome showed 20.4% for A, 47.3% for T, 17.5% for C, and 14.8% for G, respectively. The mitochondrial genome A + T base composition (67.7%) of 12 PCGs was higher than G + C (32.3%), while the complete mitochondrial genome A + T base composition (66.3%) was higher than G + C (33.7%).
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