Selection: Thorunna halourga

Thorunna halourga Johnson & Gosliner, 2001

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The mantle of Thorunna halourga is a pale lilac becoming purple in front of the rhinophores and behind the gills. The mantle margin has a broad white band. The rhinophores have a purple stalk and the lamellae are edged with orange. The gills are white with orange axes.
Pretty similar are:
Hypselodoris bullocki which differs by the pale pinkish background colour, by the elevated gill pocket, and by the thin white marginal band,
Hypselodoris sp. 07 which differs by the by the elevated gill pocket,
Hypselodoris sp. 08 which differs by the dark dark blueish-lilac background colour, by the elevated gill pocket, and by the blueish-lilac colour of the gills,
Hypselodoris apolegma which differs by the purple colour, by the elevated gill pocket, and by the reticulate white edging of the mantle.
More informations on Thorunna halourga are at Bill Rudman's Sea-Slug Forum!