Fig. 2From: Measurement of refractive indices of tunicates’ tunics: light reflection of the transparent integuments in an ascidian Rhopalaea sp. and a salp Thetys vagina Absorption spectra of the tunic of Thetys vagina (black thick line), Rhopalaea sp. (black thin line), and Diplosoma virens (grey line). The spectra of T. vagina and Rhopalaea sp. have no prominent peaks, whereas the spectrum of D. virens has an absorption peak due to UV-absorbing substancesBack to article page