Sagitta ferox is an important group of transparent marine metazoans in marine pelagic food webs, the diversity study of S. ferox in nature ecosystem is important. In this study, we report the complete mitochondrial genome sequences of S. ferox. Its complete

Pterosagitta draco is an important predator in many food webs, and so maintaining the diversity study of Pterosagitta draco in marine ecosystem is essential. In this paper, the complete mitochondrial genome sequence of Pterosagitta draco was determined.

This paper provides a brief taxonomic review of the some groups of the family Sagittidae and keys for identification of presently known species of Ferosagitta Kassatkina, 1971. The species Sagitta gloria Prado, 1961, was transferred into the genus Ferosagitta.