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Based upon the morphological characters, the genusTriplophysa(plateau Loach) is a highly diverse group in the family Balitoridae (or Cypriniformes, Cobitoidea) with 133 valid species. Therefore, the taxonomic relationship of this species at the genetic level remains ambiguous. In the present study, we sequenced the complete mitochondrial genome ofTriplophysa dorsalis. In order to understand its position and genetic background at the gene level, the characteristics of mitochondrial DNA sequences and phylogenetic relationship were examined. The mitochondrial genome ofT. dorsalisis similar to those of the typical vertebrates, 16 572 bp in length, including 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and a non-coding control region (D-loop). All genes were encoded on the heavy strand except forND6and 8 tRNA genes. The overall base composition of the heavy strand was 28.16%, 28.41%, 25.62% and 17.82% for A, T, C and G, respectively. Phylogenetic analyses showed that the sevenTriplophysaspecies clustered together withT. dorsalisto form a sister group withTriplophysa strauchii, T. bleekeri, T. stoliczkaiandT. bombifrons. The two generaTriplophysaandBarbatulaformed a sister-group relationship, the speciesHomatula potaninilocated in the intermediate position, and the genusLeptobotia elongatawas in the basal position in the subfamily Nemacheilidae. Further investigations with moreTriplophysaspecies need to be performed for better understanding of the evolutionary history of this fascinating genus. [ABSTRACT FROM AUTHOR]

The complete nucleotide sequence of the mitochondrial genome ofLucioperca luciopercawas cloned and sequenced in this study, which contained 16,542 bp. Results showed that the sequence was made up of 13 proteins, 22 transfer RNAs and 2 ribosomal RNA genes. The control region and the origin of the light strand replication were similar to other vertebrates. All protein-coding genes began with ATG except forCOX1andCOX2, theCOX1genes started with ATC andCOX2genes started with ATT, while all of those ended with TAA, TA, T or TAG. The result could be used in related studies such as molecular ecology and evolutionary biology. [ABSTRACT FROM AUTHOR]

In the present work, the complete mitochondrial genome of theTriplophysa strauchii(Cypriniformes: Cyprinidae, Balitoridae, Cobitoidea) is sequenced and placed, the phylogenetic analysis with another individual ofTriplophysafishes was carried out. The mitogenome is 16,590 bp in length, consisting 13 protein genes, 22 tRNA genes, 2 rRNA genes, and 2 non-coding regions. The total base composition is 28.26%, 28.49%, 25.42% and 17.82% for A, T, C and G, respectively. All genes were encoded on the heavy strand except for ND6 and 8 tRNA genes. These results will provide useful data for species identification and genetic study ofTriplophysafishes. [ABSTRACT FROM AUTHOR]