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In addition to sensing smells, the antennules can judge water speed to improve direction finding.
Lobsters have two urinary bladders, located on either side of the head.
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, 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.
The disease causes mineralized calculi to form in the antennal glands and gills.
These cause a loss of surface area around the gills, and the lobster eventually asphyxiates.
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.
They project long plumes of urine 1–2 meters (3 ft 3 in–6 ft 7 in) in front of them, and do so when they detect a rival or a potential mate in the area.
Paramoebiasis is strongly suspected to play a prominent role in the rapid die-off of American lobsters in Long Island Sound that occurred in the summer of 1999.
Excretory calcinosis in American lobsters in Long Island Sound was described in 2002.
This organism also causes amebic gill disease in farmed Atlantic salmon, Salmo salar.
Infection occurs throughout the tissues, causing granuloma-like lesions, especially within the ventral nerve cord, the interstices of the hepatopancreas and the antennal gland.It is dominated by mollusks (especially mussels), echinoderms and polychaetes, although a wide range of other prey items may be eaten, including other crustaceans, brittle stars and cnidarians.It only requires a few bacterial cells to cause death of otherwise healthy lobsters.Several reasons have been proposed for the cause of a recent outbreak of the disease.