The complete mitochondrial genome of the soil mite Cycetogamasus diviortus (Acari, Parasitidae) and the related phylogenetic analyses

Mites of the family Parasitidae Oudemans, 1901 (Acari, Mesostigmata) are widely distributed in soil and litter; some species harbor humus. In this study, we sequenced the complete mitochondrial genome of Cycetogamasus diviortus, representing a typical arthropod circular genome, with 14,450 bp in length, and encoding 37 genes. The gene order is in line with the reported mitochondrial genomes of other parasitid mite species. Except ND1 and ND5 start with TTG, other genes start with ATN. TAG is the stop codon of COX2, ND3 and ND4. COX3, CYTB and ND1 have special stop codons, which are incomplete stop codons T-, T- and A-, respectively. Other genes end in TAA. All tRNA genes show the typical cloverleaf secondary structures, except for the trnS1 (AGN), which lacks the DHU arm and is replaced by a simple loop. The whole mitochondrial genome of C. diviortus showed a heavy AT nucleotide bias (70.71%), a positive AT Skew (0.009), and a negative GC Skew (-0.267). Phylogenetic analyses were performed using Bayesian and Maximum Likelihood methods based on the dataset of mitochondrial nucleotide sequences of 22 mite species. The results showed that Parasitidae and Ologamasidae were more closely related to each other than other Mesostigmata groups.