Dallot and Ducret, 1969)
BL: 14-21 mm, AT: 6-8, PT: 13-16, H: 7-8. Large size of eyes characterizes this species: pigmented cell may reach a length of 0.04 mm at BL: 12 mm. Aspect of the collarette similar to that in Sagitta bipunctata.
Distribution in the South Atlantic: Unclassified species X.