Blue crayfish identification: Procambarus or Cherax?

[Corvinus]

Hello,

Some days ago I bought two crayfishes from a petstore. At first, I thought they were both Procambarus alleni, but a more thorough examination revealed that at least one of them is Cherax quadricarinatus, and the other one appears to be P. alleni, but I'm not sure.

Please, could you identify the crayfish of the photos and tell me the differences with the Cherax genus?

Thank you

[Mustafa]

Procambarus alleni. If you search for pictures of the Cherax destructor on the web, you'll easily see the differences. A picture speaks a thousand words...