Color: Variable, from light to red to violet or deep purple. Reverse counter-shading (the dorsal surface lighter than ventral surface) is pronounced in some species, absent in others.
- OLU K. SIBUET M., HARMEGNIES F., FOUCHER J.-P. & A. FIALA-MÉDIONI (1996) Mar. Ecol. Progr. Ser. 132: 109-125.
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