Chromodoris rubrocornuta from American Samoa

Dear Manou,
This is an interesting find. It has a superficial similarity to some colour forms of Chromodoris fidelis but that species always has black gills and rhinophores, although the rest of its colour pattern is quite variable. Your animal is Chromodoris rubrocornuta. The gills are a translucent red and the mantle margin has a broad outer orange band and then a deep reddish band which broadens then narrows along its inside edge to give a characteristic pattern of red scalloping. There is then a narrow line of opaque white separating the red from the translucent white of the rest of the mantle.
Best wishes,
Bill Rudman