Lobsters awaiting purchase in in, Lobsters comprise a ( Nephropidae, sometimes also Homaridae) of large marine. Lobsters have long bodies with muscular tails, and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, which are usually much larger than the others.

Highly prized as, lobsters are economically important, and are often one of the most profitable commodities in coastal areas they populate. Commercially important species include two species of (which looks more like the stereotypical lobster) from the northern Atlantic Ocean, and (which looks more like a shrimp, or a 'mini lobster') – the Northern Hemisphere genus and the Southern Hemisphere genus.

After a wholly unscientific survey of these calculators (methodology: Google Longevity Calculator and test a few) my favorite is the Northwestern Mutual Longevity Game even though I scored a longer life when I plugged my stats into the AARP Vitality Compass (96.3 years old, with a promise/threat that I. Lobster anatomy includes the cephalothorax which fuses the head and the thorax, both of which are covered by a chitinous carapace, and the abdomen. Xinjiang Uygur Autonomous Region شىنجاڭ ئۇيغۇر ئاپتونوم رايونى 新疆维吾尔自治区; Autonomous region. Test your life expectancy with the Lifespan Calculator from Northwestern Mutual.

Although several other groups of crustaceans have the word 'lobster' in their names, the unqualified term 'lobster' generally refers to the clawed lobsters of the family Nephropidae. Clawed lobsters are not closely related to or, which have no claws (), or to. The closest living relatives of clawed lobsters are the and the three families of freshwater.

Eyestalk of a lobster Lobster anatomy includes the which fuses the head and the, both of which are covered by a, and the abdomen. The lobster's head bears, antennules,, the first and second, and the first, second, and third. Because lobsters live in murky environments at the bottom of the ocean, they mostly use their antennae as sensors. The lobster eye has a reflective structure above a convex retina. In contrast, most complex eyes use refractive ray concentrators (lenses) and a concave retina. The abdomen includes and its tail is composed of and the. Lobsters, like snails and spiders, have blue blood due to the presence of, which contains.

In contrast, vertebrates and many other animals have red blood from -rich. Lobsters possess a green, called the by chefs, which functions as the animal's and.

Lobsters of the family Nephropidae are similar in overall form to a number of other related groups. They differ from freshwater in lacking the joint between the last two segments of the thorax, and they differ from the reef lobsters of the family in having full claws on the first three pairs of legs, rather than just one. The distinctions from fossil families such as the are based on the pattern of grooves on the carapace. Longevity [ ] Lobsters live up to an estimated 45 to 50 years in the wild, although determining age is difficult. In 2012, a report was published describing how growth bands in calcified regions of the or gastric mill in shrimps, crabs and lobsters could be used to measure growth and mortality in decapod crustaceans. Without such a technique, a lobster's age is estimated by size and other variables; this new knowledge 'could help scientists better understand the population and assist regulators of the lucrative industry'. Directive 90 496 Cee Pdf File.