Amphipholis squamata is a luminescent polychromatic ophiuroid species. The population from Normandy (France) exhibits six different coloration patterns (orange, beige, dark brown, grey, spotted and black). Each variety of ophiuroid exhibits a different pattern and intensity of luminescence as induced by acetylcholine. The luminescence of dark brown and of black specimens was investigated over six months. A significantly higher intensity of luminescence was observed in February for both varieties.
De Bremaeker, N., Baguet, F., & Mallefet, J. (1999). Characterization of acetylcholine-induced luminescence in Amphipholis squamata (Echinodermata : Ophiuroidea). Belgian Journal of Zoology, 129(2), 353-362. https://hdl.handle.net/2078.5/42324 (Original work published 1999)