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Azygia   hwangtsiyui    (  Trematoda  ,   Azygiidae  ), a neglected parasite of predatory fishes, is little-known in terms of its molecular epidemiology, population ecology and phylogenetic study. In the present study, the complete mitochondrial genome of    A.   hwangtsiyui    was sequenced and characterized: it is a 13,973 bp circular DNA molecule and encodes 36 genes (12 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes) as well as two non-coding regions. The A+T content of the    A.   hwangtsiyui    mitogenome is 59.6% and displays a remarkable bias in nucleotide composition with a negative AT skew (–0.437) and a positive GC skew (0.408). Phylogenetic analysis based on concatenated amino acid sequences of twelve protein-coding genes reveals that    A.   hwangtsiyui    is placed in a separate clade, suggesting that it has no close relationship with any other trematode family. This is the first characterization of the    A.   hwangtsiyui    mitogenome, and the first reported mitogenome of the family   Azygiidae  . These novel datasets of the    A.   hwangtsiyui    mt genome represent a meaningful resource for the development of mitochondrial markers for the identification, diagnostics, taxonomy, homology and phylogenetic relationships of trematodes.

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Characterization and comparative analysis of the complete mitochondrial genome of    Azygia   hwangtsiyui    Tsin, 1933 (  Digenea  ), the first for a member of the family   Azygiidae