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The complete mitochondrial genome of Fimbriaria fasciolaris is reported for the first time in this study. Its entire mitogenome is 13,543 bp in length, contained 12 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and 2 non-coding regions. The arrangement of the twelve PCGs was identical to that of most cestode mtDNA sequence. Among all the cestodes mitochondrial genomes consulted from GenBank database, there existed a tiny difference in the order of trnY, trnL1, trnL2, and trnS2. The phylogenetic analysis by Bayesian inference method shows that F. fasciolaris of this study was confirmed to be a member of family Hymenolepididae.

The complete mitochondrial genome sequences of Heterakis dispar were determined for the first time in present study. The lengths of mtDNA sequences of H. dispar is 13,995 bp in size, containing 12 PCGs (cox1-3, nad1-6, nad4L, atp6, and cytb), two ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, and two non-coding regions, all genes are encoded by the same strand. The phylogenetic analysis by Bayesian inference method revealed that Ascaridiidae was closely related with Heterakidae than to other Ascaridida nematodes. In Heterakidae, H. dispar was closely related with H. gallinarum than to H. beramporia with high statistical support. The mtDNA dataset provided useful genetic markers for studying the molecular ecology, systematics, and population genetics of Ascaridida nematodes.