The tiger shark Galeocerdo cuvier is the only member of the genus Galeocerdo. The complete mitochondrial genome of G. cuvier is presented for the first time in this study. The gene composition and arrangement in the mitogenome of G. cuvier is identical to most animal mitogenome. There are 22 bp short noncoding sequences and 44 bp overlaps in the mitogenome. The overall base composition is 31.8% A, 23.9% C, 13.0% G and 31.3% T. The dihydrouridine arm of tRNA-Ser2 was replaced by a simple loop and the other tRNAs could be folded into the typical cloverleaf structure.
The blue-spotted stingray Neotrygon kuhlii is a small stingray distributed in the Indian and West Pacific Ocean. It was considered a species complex by morphological and molecular evidences. In this study, we firstly presented the complete mitochondrial genome of N. kuhlii. It is 18,039 bp in length, including 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes and 1 control region, with the typical gene order in the mitogenomes of vertebrates. The total base composition is 31.9% A, 26.4% C, 13.1% G and 28.6% T, with an A + T bias of 60.5%. Alignment results demonstrated that the mitochondrial sequences of N. kuhlii in this study were highly similar to the 12S, 16S, COI and Cyt b sequences of the specimens collected from the Chinese seas in other studies.
In this study, we first present the complete mitochondrial genome of
Hemipristis elongata
, the only member of genus
Hemipristis
in family Hemigaleidae. It is 16,691 bp in length with the typical gene order invertebrates. Its overall base composition is 31.7% A, 24.1% C, 12.9% G and 31.3% T. Two start codons (ATG and GTG) and three stop codons (TAG, AGA and TAA/T) are found in the protein-coding genes. The 22 tRNA genes ranged from 67 bp (tRNA-
Cys
, tRNA-
Ser
2) to 75 bp (tRNA-
Leu
1). The phylogenetic result showed that
H. elongata
was clustered to
Hemigaleus microstoma
and formed Hemigaleidae.
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