Coryphella Gray, 1850, restricted

Korshunova, Tatiana, Martynov, Alexander, Bakken, Torkild, Evertsen, Jussi, Fletcher, Karin, Mudianta, I Wayan, Saito, Hiroshi, Lundin, Kennet, Michael Schroedl, & Picton, Bernard, 2017, Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda), ZooKeys 717, pp. 1-139 : 23-25

Coryphella Gray, 1850, restricted Figs 2, 18, 19, 20, 21

Type species.

Eolidia verrucosa M. Sars, 1829

Diagnosis.

Body narrow. Notal ridge completely reduced. Cerata in several groups. Rhinophores smooth with small tubercles. Anterior foot corners present. Rachidian teeth with non-compressed cusp and distinct denticles. Lateral teeth denticulated without attenuated process basally. Separated distal and proximal receptaculum seminis. S-shaped thick prostatic vas deferens. Penis disk-shaped with numerous small triangular processes at the disk edge.

Species included.

Coryphella pseudoverrucosa Martynov, Sanamyan, Korshunova, 2015 (Fig. 18) (original description in Martynov et al. 2015), Coryphella verrucosa (M. Sars, 1829) (Figs 19, 20) (original description in M. Sars 1829).

Remarks.

In the restricted sense the genus Coryphella Gray, 1850 represents a well-defined unit of narrow-bodied coryphellids with completely reduced notal edge and characteristic thick S-shaped prostatic vas deferens (Figs 18H, 19J, 20I, 21). Two morphologically similar species, the North Atlantic type species of the genus C. verrucosa and the North Pacific C. pseudoverrucosa , are clearly distinguished both morphologically (particularly the shape of the rachidian teeth of the radula) and according to our molecular analysis (Fig. 1).