A new species of Janolus Bergh, 1884 from the Northeastern Pacific (Gastropoda, Nudipleura, Proctonotidae)

Scuba divers collected a new species of Janolus Bergh, 1884 from mud bottoms in the near shore fjords and inlets of southern British Columbia, Canada and Puget Sound, Washington, USA. This new species is sympatric with Janolus fuscus O'Donoghue, 1924 and morphologically similar to this species. Janolus gelidus Millen, spec. nov. is separated from the latter by its orange body and papillae and opaque white diamond shape spot, capping the top of the papillae and elongating into a streak, frosting the inner apex. It also differs in its possession of a white rim to the foot and white mid dorsal line posterior to the papillae. It lacks the orange subapical band on the papillae and red mid-dorsal line of J. fuscus. Internally, oral glands, found in J. fuscus, are lacking, and the jaw morphology, radular and reproductive features differ significantly. This new species is described and compared to other similar Janolus species worldwide.