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Sea slug feast

Some nudibranchs (Mollusca, Gastropoda, Opistobranchia, Nudibranchia) are armed with stinging structures, called cnidocysts or nematocysts, which they steal from their cnidarian prey (in this case the hydroid Ectopleura obypa) for their own defense. When the nudibranch eats a cnidarian, the unfired nematocysts are moved out to the dorsal, fingerlike structures on its back (the cerata), where they are stored in a sac, the so-called cnidosac (the bright white structure at the tips of the cerata) and remain fully functional. For protection, the nudibranch can expel the nematocysts through a pore at the tip of the cerata. The sea slug crawls on the stems of its prey, the tubulariid hydroid Ectopleura obypa (Cnidaria, Hydrozoa, Hydroidolina, Anthoathecata, Aplanulata, Tubulariidae). Because the nudibranch is translucid, it is possible to see the green tissues of the cnidarian passing through its gut during the spicy meal. See also:    • Pseudovermis salamandrops - an interstitia...  . More images of marine creatures at http://cifonauta.cebimar.usp.br/ Centro de Biologia Marinha, Universidade de São Paulo, Brazil http://cebimar.usp.br/index.php/en/   / cebimarusp