(Jimmy of the Clue Crew delivers the clue from the Institute of Marine Sciences at UC Santa Cruz.)  Though it has the name of an often fierce big cat, this type of shark is a menace to clams but not to people
These types of polymor- phisms  often called trophic polymor- phisms 
because ...... anc geneticists; phylogenetic history may of fer little in the way of 
clues.