In this study, we determined the complete mitogenome of Sphaeroma terebrans (Crustacea, Isopod, Sphaeromatidae), which was the first one in the family Sphaeromatidae. The mitogenome of S. terebrans was 15,540 bp in length and contained 13 protein-coding genes, 21 tRNA genes, 2 rRNA genes, 1 control region, and 2 unknown fragments which is longer than 200 bp. The overall base composition was 30.1% A, 14.9% C, 21.3% G, and 33.7% T. Six start codons (ATA, ATC, ATG, ATT, ACG, GTG) and three stop codons (TAA, TAG, T-) were found in the protein-coding genes. The size of 21 tRNA genes ranged from 51 to 66 bp, tRNA-Gly was not found. All nodes strongly supported that S. terebrans was placed as sister to Sphaeroma serratum in the maximum likelihood tree.
The complete mitochondrial genome of the ringstraked guitarfish Rhinobatos hynnicephalus is firstly presented in this study, which is also the first representative in the family Rhinobatidae. It is 16,776 bp in length and contains 37 genes and one control region as the typical gene arrangement and transcriptional direction in vertebrates. The overall base composition is 31.7% A, 26.8% C, 13.5% G and 28.1% T. The 22 tRNA genes ranged from 67 bp (tRNA-Ser2) to 75 bp (tRNA-Leu1). The origin of L-strand replication (OL) sequence was identified between tRNA-Asn and tRNA-Cys genes. The termination associated sequence (TAS) and the conserved sequence blocks (CSB 1--3) were recognized in the control region.
The complete mitogenome of Sphaeroma sp. (Crustacea, Isopod, Sphaeromatidae) was determined in this study. The total length of mitogenome was 15,839 bp, and contained 13 protein-coding genes, 21 tRNA genes, 2 rRNA genes, 1 control region, and 2 unknown fragments which longer than 200 bp. The nucleotide composition was 25.80% A, 16.56% C, 25.94% G and 31.67% T. Six initiation codons (ATA, ATC, ATG, ATT, ACG, GTG) and three termination codons (TAA, TAG, TA-) were used in the protein-coding genes. The length of tRNA genes ranged from 52 to 65 bp, and tRNA-Arg was not identified. The phylogenetic result showed Sphaeroma sp. was closely related to Sphaeroma terebrans with high bootstrap value supported.
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