Whatever feather duster you want? Tell him you want a Fabricia stellaris and see what he says. :lol: (It's about 1/16" long) It's nice to hear that an lfs is concerned with scientific names but since most worms are mis-identified to begin with I find this highly amusing!
Some on-line lfs stores do have images. First check out the vendors listed on RC to see what they have. It might also be fun for you to do image searches for Sabellastarte, Bispira, Protula, and Megalomma. These are the most common genera listed by lfs stores & also most commonly photographed by divers.