The Marbled Crayfish (Procambarus virginalis), also known as the marmorkrebs, is a medium-sized freshwater crayfish. It is the only known decapod crustacean that reproduces entirely by obligatory parthenogenesis. This means the entire population consists of all-female triploid clones that reproduce asexually. They create genetically identical offspring without requiring sperm or egg fertilization. It was first discovered in the German pet trade in the earl 1990s, it is a highly adaptable species which  has rapidly evolved into a highly destructive invasive species worldwide. It was first reported in the wild in Germany but has since been reported in the wild in several other European countries, Madagascar,  Canada, USA as well as in Israel, Japan, Taiwan, Macao and South Korea. 

Marbled  Crayfish in North America

Marbled Crayfish in Madgascar.

Marbled Crayfish  BIOLOGY