These bivalves have been moved to the "other" group since there is no separate category for molluscs.
Looks like some nasty invasives, probably quagga, but might also be zebra mussels. Compare quagga to zebra mussels here: http://el.erdc.usace.army.mil/zebra/zmis...
Lat: 42.04, Long: -83.20
Spotted on May 27, 2012
Submitted on May 27, 2012