If you go to the web site of the Freshwater Mollusk Conservation Society there is a link to regional guides and keys: http://molluskconservation.org/index.html
I dont know much about mussels but there is a mussel key for ohio mussels: http://www.amazon.com/Freshwater-Mussels-Ohio-Thomas-Watters/dp/0814211054 sherr On Thu, Jan 27, 2011 at 9:04 AM, Chalfant, Brian <bchalf...@state.pa.us<mailto:bchalf...@state.pa.us>>wrote: > Greetings all - > > Anyone got recommendations as to a comprehensive, accurate key - or keys - > for freshwater bivalves and gastropods that would cover taxa occurring in > Pennsylvania? > > Much obliged - > Brian > > Brian A. Chalfant | -ologist > Pennsylvania Department of Environmental Protection > Rachel Carson State Office Building > 400 Market Street | Harrisburg, PA 17101 > Phone: 717.787.9639 | Fax: 717.772.3249 > www.depweb.state.pa.us<http://www.depweb.state.pa.us/><http://www.depweb.state.pa.us/> Caryn C. Vaughn Director, Oklahoma Biological Survey Presidential Professor of Zoology University of Oklahoma Norman, OK 73019 (405) 325-4034 http://faculty-staff.ou.edu/V/Caryn.C.Vaughn-1/
