Also your pictures are not good enough showing the necessary details and features that characterize each specie. Usually 1st form males are needed for positive ID. For common easily recognizable species the females and older males can be used.
Seventeen species of crayfish have been reported from IN. If you collected these from a stream it is probably not one of those reported in this paper that are primary burrowers.
http://www.in.gov/dnr/fishwild/files/fw_Burrowing_Crayfish_of_Indiana_March_2008.pdf I used to work with this author. From the study:
Crayfish have been collected, studied, and used for bait
in Indiana for over 100 years. Hobbs (1989)
identified 17 species of crayfish known from Indiana,
including four of the five known Indiana species of
primary burrowing crayfish. More recently, Simon
(2001) listed 22 species from the State.
A primary burrowing crayfish is a species whose life
history includes spending significant periods in a
burrow that is not usually connected to surface waters
(e.g., streams or lakes). Mating often occurs outside
of the burrows during spring flood periods.
Here is a list of the crayfish of Indiana. Cross off the primary burrowing ones and then yours, assuming they are the same specie, is/are one of the remaining species - probably one in the genus Orconectes.??
http://iz.carnegiemnh.org/crayfish/country_pages/state_pages/indiana.htmAlso see this in the introduction which describes why crayfish are harder to identify than most fish. When you start looking at pictures of the different crayfish you will soon understand why your picture is inadequate to provide a specie name.
http://el.erdc.usace.army.mil/ansrp/ANSIS/html/orconectes_virilis_northern_crayfish.htm
