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The American lobster (Homarus americanus) is a species of lobster found on the Atlantic coast of North America, chiefly from Labrador to New Jersey. It is also known as Atlantic lobster, Canadian lobster, true lobster, northern lobster, Canadian Reds, or Maine lobster. It can reach a body length of 64 cm (25 in), and a mass of over 20 kilograms (44 lb), making it not only the heaviest crustacean in the world, but also the heaviest of all living arthropod species. Its closest relative is the European lobster Homarus gammarus, which can be distinguished by its coloration and the lack of spines on the underside of the rostrum. American lobsters are usually bluish green to brown with red spines, but several color variations have been observed.
American lobsters (Homarus americanus) are typically murky brown, green, or light orange. European lobsters (Homarus gammarus) have dark navy blue or purpleish coloring.
Their unique shade is the consequence of a genetic abnormality that results in the overproduction of a certain protein. Because they’re extremely rare, experts put the odds of this coloring anomaly at one in two million. However, these stats are merely guesses.
The odds of finding this two-toned blue lobster are one in 50 million.