Chiropsalmus zygonema Haeckel, 1880

Remarks: the species was only observed by Haeckel (1880: 641), who provided a brief description. Gershwin (2006: 12) maintained the species as valid until further specimens appear. The species may represent in immature or malformed specimen of Chiropsalmus quadrumanus .

Distribution in South America: medusa—Atlantic Ocean, off Argentina (Haeckel 1880; Gershwin 2006). Habitat: medusa—unknown, probably neritic.