Thecacera pennigera
Thecacera pennigera , common name the winged thecacera , is a species of sea slug , a nudibranch , a shell-less marine gastropod mollusc in the family Polyceridae . 
<triplet> gastropod <subj> mollusc <obj> parent taxon <triplet> Polyceridae <subj> nudibranch <obj> parent taxon