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.

Extensive summary on morphology, ecology, behaviour, and systematics of arrow worms (Chaetognatha). Contains numerous original images, especially from TEM.