Specimen from 20 m depth at Split, Croatia. Length 30 mm. © J. Prkić.
Features below, based on / calculated from Bergh (1882), are of a single 40 mm, live specimen of F. vicina (lost holotype).
Body length/width 4.7. [Split specimen about 4.5]
Cerata up to 22.5 % of body length. [Split 56%.]
Dorsum of tail, proximal half of oral tentacles and anterior face of cerata have bluish-silver iridescence. [Split: blue absent. Extent and intensity varies in Croatia.]
Cerata have a chalky-white tip. [Recent Croatian finds also have an opaque white line or dots (1) running down from the white tip.]
The lamellated rhinophores have a median row of discrete, elongated white spots between and behind them, almost to the pericardium. [Between and behind, but not near pericardium on this one from Split].
Bright rosy red head, particularly intense on the front and under the neck. [Red reduced on this Split specimen and absent from several others in Croatia.]
Long oral tentacles (2) nearly 2 X rhinophore length and 25% body length. [Split; over twice rhinophore length and 51% of extended body length]