Astacus fluviatilus (freshwater crayfish)

A species of freshwater crayfish formerly common through out streams and brooks of western and northern Europe.  Dissection on the left shows the heart (central red structure) with blood vessels (also red), muscle blocks (anterior pink ovals), and Liver (brown elongate structures in thoracic cavity).  Dissection on the right shows the cardiac portion of the stomach (anterior blue structure with “T” shape in it), the pyloric section of the stomach (narrowing part of blue structure), the caecum (brown bulb immediately posterior to pyloric stomach), hind gut (long brown canal in abdomen) and again livers (paired brown structures on either side of alimentary canal.