I can help with answers if you have questions about separating the crayfish genera and species.
Bill I am on my third book of Alfred Russel Wallace who was a British naturalist, explorer, geographer, anthropologist, biologist & taxidermist with a similar education as yourself and did most of his work in the mid 1800's. I had been confused with genus and species. So I finally took the time to look it up after you mentioned it. The first scientific Latin word is for the genus and the second word is for the species. And this may change to what is called clade.
I was wondering if you have come across any new species in your work?
