Family Pterosagittidae Tokioka, 1965a

Diagnosis.

Wide head. Two rows of teeth. Collarette wide and extending through full body. One pair of rayed lateral fins located on the tail. Intestinal diverticula absent. Only one genus has been described within this family: Pterosagitta (Costa, 1869).

Remarks.

A previous phylogenetic study reported that Pterosagittidae is genetically quite close to Sagittdae (Gasmi et al. 2014; Nair et al. 2015; Peter et al. 2020; Müller et al. 2019). In this study, a recent research paper was reviewed and Pterosagittidae was marked as invalid (Table 1).