Fig. 2

Histological sections of tissues from A Exaiptasia diaphana and B Berghia stephanieae. Only nematocysts (purple capsules around pink or purple shafts) from the anemone tissue are sequestered inside cnidosacs, whereas spirocysts (pink spiral with unstained capsules) and dinoflagellates remain in the digestive gland in B. stephanieae. E. diaphana tissues (cross section) include C tentacles (SIO-BIC Co3615) and (E) acontia (SIO-BIC Co3616). B. stephanieae tissues (longitudinal section) include (D) the cnidosac (SIO-CIC M18637) and (F) digestive gland (SIO-BIC M18638). Panels C and F show close-up images of nematocysts (C’,F’), spirocysts (C’’,F’’), and dinoflagellates (C’’’, F’’’). Abbreviations: ac, acontia; cs, cnidosac, d, dinoflagellates, dg, digestive gland; m, musculature; nem, nematocyst(s); sp, spirocyst(s); ten, tentacles