The Eurasian oystercatcher Haematopus ostralegus is a relatively large migratory wader with an extremely large distribution range.The objective of this study was to determine the complete mitogenome sequence of H. ostralegus, and illustrating mitogenomes structure and investigating their evolutionary relationship by comparing 31 species in Charadriiformes.The complete mitochondrial genome of H. ostralegus is a circular molecule of 16,798 bp in length and the overall nucleotide composition of H-strand was A: 31.45%, T: 23.46%, C: 31.30%, G: 13.79%. In Charadriiformes mitogenomes, AT skews values were positive, while the values of GC skew were negative. We found a significant negative correlation between CBI and ENC, and a significant positive correlation was found between CBI and G + Cc and G + C3s. The ratio of Ka/Ks of all PCGs indicated that all these genes evolved under purifying selection. Evidence of positive selection was obtained for three (ND2, ND4 and ND6) genes by at least one of the methods. This study provides a valuable resource facilitating further study of phylogenetic and evolutionary analysis for wader, and improves our understanding of the evolutionary and taxonomic research within Charadriiformes.
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