I would recommend "The Pearly Mussels of PA" by Spoo and "The Freshwater Gastropods of New York" by Jokinen. That should take care of the mussels and Atlantic slope snails, but I don' t know if there's a good resource for gastropods in the western part of the state. The most comprehensive is Burch's work.
Burch's 1982 EPA report on snails is available in pdf form on the web at: http://nepis.epa.gov/Exe/ZyNET.exe/10004R98.TXT?ZyActionD=ZyDocument&Client=EPA&Index=1981+Thru+1985&Docs=&Query=600382026+Freshwater%20snails%20of%20the%20United%20States%20EPA&Time=&EndTime=&SearchMethod=3&TocRestrict=n&Toc=&TocEntry=&QField=pubnumber^%22600382026%22&QFieldYear=&QFieldMonth=&QFieldDay=&UseQField=pubnumber&IntQFieldOp=1&ExtQFieldOp=1&XmlQuery=&File=D%3A\zyfiles\Index%20Data\81thru85\Txt\00000000\10004R98.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h|-&MaximumDocuments=10&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=p|f&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x Rob Dillon in SC is in the process of making this easier for all of us (Freshwater Gastropods of NA website), but he's mainly done the southeastern states so far. Hope this helps, Travis T. Travis Brown ttravis.brow...@gmail.com > 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/> >
