EurekAlert! is reporting that the Harris mud crab (Rhithropanopeus harrisii) has definitely arrived in the Panama Canal. Researchers have discovered breeding populations of the invasive crab, native to the Atlantic coast of the US, in Miraflores Third Lock Lake. The lake has actually been separated from the canal system for decades, but is now scheduled to be reconnected as part of an expansion project. Now it's up to those researchers to determine just how widespread the crab is within the canal system.
The Harris mud crab is already quite widespread in Europe, and can be found in Russia as well. With all the concern about green crabs, Asian shore crabs, and the Chinese mitten crab invading the Atlantic coast of the US (check out all of the ISW articles on crabs), it is interesting to see a species native to that region becoming invasive in other parts of the world.