Penion mandarinus
Penion mandarinus , common name the mandarin penion , southern siphon whelk or Waite's buccinum whelk , is a species of medium-to-large predatory sea snail or whelk , a marine gastropod mollusc in the family Buccinidae , the true whelks . 
<triplet> whelk <subj> sea snail <obj> subclass of <triplet> gastropod <subj> mollusc <obj> parent taxon