| Summary: | Chaetognaths possess simplified body plan that puzzled their morphological phylogenetic classification. Three complete mitochondrial genomes were determined for Zonosagitta bedoti, Z. pulchra, and Aidanosagitta regularis, and one partial mitochondrial genome was obtained for Ferosagitta robusta. The mitochondrial genomes of the species were small owing to the loss of 23 genes, ranging from 11,604 bp to 12,123 bp. Large-scale rearrangement was also observed in the obtained mitochondrial genomes resembled those of most other Sagittidae species. Our phylogenetic results questioned monophylic status of Zonosagitta because of the inclusion of Ferosagitta and Aidanosagitta in the Zonosagitta clade. Monophyly of Parasagitta and Feerosagitta were supported.
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