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Thorunna halourga  R.F. 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.
This species was posted on 20 April 2004 at these websites as Thorunna halourga  Johnson & Gosliner, 2001.
It is a convention in malacology to use the first initials of authors with the same family name to distinguish between them,
that is R.F. Johnson for Rebecca Fay Johnson and S. Johnson for Scott Johnson. I changed the authority on 9 May 2016.
Pretty similar are:
Hypselodoris bullockii 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 sp. 10 which differs by the dark dark blueish-lilac background colour, by the elevated gill pocket, by the blueish-lilac colour of the gills, and by the dark blueish-lilac colour of the rhinophore clubs.
Hypselodoris apolegma which differs by the purple colour, by the elevated gill pocket, and by the reticulate white edging of the mantle.
More information on Thorunna halourga are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 9 May 2016, Thorunna halourga  R.F. Johnson & Gosliner, 2001
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Thorunna_halourga.htm