What came to mind when you mentioned invertebrates? The discussion has
been mostly crawfish. The first thing that came to my mind was insect
larvae; in which case I'd recommend "Freshwater Macroinvertebrates of
Northeasern North America" Peckarsky, Fraissinet, Penton, and Conklin
jr. It also has > 400 pages but is focused more on the Insect larvae.
It is part key and part discription with diagrams. Not too detailed
breaking most groups down to genera in some cases. Got it off of
Bioquip.com
John
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