1. Quagga Mussel
   Quagga mussels are native to the Caspian Sea drainage area in Eurasia. They most likely arrived as stowaways in the ballast water of ocean going ships.
   http: //dnr.state.wi.us/org/caer/ce/eek/critter...
   
   
2. Zebra Mussel
   Polymorpha means "many forms." Zebra mussels come in many colors. Most are white or cream-colored with jagged brown or black stripes
   http: //dnr.state.wi.us/org/caer/ce/eek/critter...