<Tr> <Th_colspan="2"> Binomial name </Th> </Tr> <Tr> <Td_colspan="2"> Orconectes rusticus (Girard, 1852) </Td> </Tr> <P> The rusty crayfish (Orconectes rusticus) is a large, aggressive species of freshwater crayfish which is native to the United States . Its range is rapidly expanding in North America, displacing native crayfishes in the process: it is known to have reached New England, Ontario, Illinois, Wisconsin, Michigan, Minnesota, Iowa, Missouri, Colorado, New Jersey, New York, Pennsylvania, Maryland, and even Manitoba . It was first spotted in the mid 1960s . The rusty crayfish was first captured in Illinois in 1973, and has been collected at over 20 locations in the northern portion of the state . In 2005, O. rusticus was found for the first time west of the Continental Divide, in the John Day River, Oregon, which runs into the Columbia River . </P> <P> Adult rusty crayfish can reach lengths of over 10 centimeters (4 inches), although they reach maturity at about 4.4 cm (1.7 in), and can range in color from greenish grey, to reddish brown, They can be easily recognized by two "rusty", reddish colored spots on the sides of their back and their large front claws with blank bands around the tips . Male rusty crayfish have small hook - like features on their first pair of hind legs that they use to hold onto a female while mating . </P>

Where did the rusty crayfish originally come from