Halgerda diaphana  Fahey & Gosliner, 1999

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Halgerda diaphana is characterized by its white ridges with orange lines. There can be orange marks between the ridges. The mantle edge has a submarginal orange band and a margin of intense white. The gills and rhinophores are translucent white with closely sprinkled black spots.
More information on Halgerda diaphana are on Bill Rudman's Sea-Slug Forum!