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Pictures of Chromodoris elisabethina
Author: Nila Murti
Both have elongated bodyform, both have yellowish or orange-ish gills and rhinophones, both have similar mantle colouration and colour variation - pale to bright blue in the middle with black elongated lines bordering the blue area, and faded to bright orange mantle margin.
Chromodoris elisabethina normally has more elongated black lines in the blue area, sometimes a median line, often some broken shorter lines.
Chromodoris annae usually has no or less black lines, but some have been found to have multi black lines like Chromodoris elisabethina.
So what's the telltale difference? Apparently it's the uniformity of the blue colour. If it's smooth and uniformly coloured then it's Chromodoris elisabethina, while if the blue area has tiny dark speckles hence not uniform (zoom your photos to see it!) then it's Chromodoris annae.