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Thorunna florens has a translucent whitish purple body with purple submarginal spots or a purple submarginal band. It is characterised by a transverse orange patch on the front of the mantle, followed by a white band/patch. There is a double ring of outer yellow and inner white on the middle of the mantle. The rhinophores and the branchial plumes are orange.
Thorunna cf. florens differs from Thorunna florens
- by the two broad dark pink longitudinal bands, outlined in opaque white (no double ring of yellow and white),
- by the translucent whitish gills with orange tips, and
- by the white spot on the orange rhinophores. It looks similar to the top left specimen of Thorunna florens in IPN at page 254, and to Thorunna sp. 1 at page 253.
Pretty similar are:
Mexichromis aurora which differs by three wide whitish yellow longitudinal bands each outlined with opaque white, and by purple or blue spots between the bands and near the margin, and by small opaque white submarginal spots,
Hypselodoris maculosa which differs by multiple longitudinal white lines and reddish or reddish violet spots on the mantle, and by white rhinophores with up to three orange bands,
Thorunna australis which differs by two longitudinal white lines, one on either side of the mantle and always one reddish band on the white rhinophores.
More information on Thorunna florens are on Bill Rudman's Sea-Slug Forum!