Lobster Lingo: Get to Know the Parts of a Lobster

Learn about the parts and anatomy of a lobster as well as the lingo used in the lobster trade. Note this guide and glossary covers the basic parts of the Maine lobster—the kind of lobster found in the cold-waters of the Atlantic coast.

Lobster Parts

Here is a little primer on the parts of the lobster so you know what your cracking into! Speaking of eating lobster, learn how to crack and eat a whole lobster.

Shell: The shell is the lobster’s skeleton and it cannot grow. A lobster must shed it’s shell in order to grow. It’s called molting. Find out why molting is important in buying a good hard-shell lobster.

Antennas: Lobsters have four long and thin antennas covered by tiny hairs. Lobsters flick their antennas to smell.

Stalks: Lobsters have eyes on long, thin structure called stalks. Find out more about lobster’s compound eyes.

Carapace: It is the armor-like  body of the the crustacean with the claws, knuckles and tail removed. It houses the legs, tomalley (see below), and, in the females, the roe (see below). In the State of Maine legal lobsters are measured by shell length. Lobsters that measure under  3 ¼ inches or more than than five inches have to go back in the water.

Legs: Lobsters have 10 legs. The four pairs of legs contain small strips of meat that take some work to remove. Lobsters use the eight back legs to walk. The front legs have claws called pincers. Lobsters will walk along the ocean  floor at night in search of food.

Claws: Lobsters use their claws to catch food and battle predators and other lobsters. The larger of the two claws is called the crusher claw and the smaller claw is called the pincer or cutter claw. The claws of hard shell lobsters are full of tender, sweet meat.

Knuckles: The two joints to connect the large claws to the carapace. Connoisseurs say the knuckle meat is the tastiest.

Tails: The tail holds the biggest piece of meat in the lobster.

Parts-Lobster
Click to enlarge infographic.

What’s the Stuff Inside Your Lobster?

Ever wonder what the stuff is inside a freshly cracked open lobster?

Roe: The red stuff is the “coral” or tiny lobster eggs of the female lobster. The roe is black uncooked. Lobster eggs were once considered a delicacy, like caviar.

White Stuff: The lobster blood, looks like egg whites, uncooked, it’s clear. Try it in sauces.

Tomalley: The light-green “tomalley” in the carapace of the lobster is the liver and pancreas. Although lobster lovers adore the rich as butter tomalley, it should not be eaten regularly. As with other animals, contaminants may settle in the liver, so its best to be on the safe side.

Lobster Sizes

What size lobster to buy?

Shorts or Snappers:  A lobster under the legal size limit.

Canners: Small lobsters approximately 1/2 to 1 lb.  They took their name in the 1880’s because this size lobsters were “canned” and sold on shelves.

Market:  A size category for lobsters available for sale ranging from 1 to 3 lbs.

Chickens: A lobster weighing about 1 pound.

Culls: A lobster that has lost one or both claws. Normally sold at a lower price.

Quarters: A lobster weighing 1-1/4 pounds. Buy quarters

Selects: A lobster weighing from 1 ½ to 1 3/4 pound. Buy select lobsters.

Deuces: A lobster weighing about 2 pounds. Buy deauces or 2 lb. lobsters.

Jumbos: A lobster weighing over 2-1/2 pounds. Order jumbo lobsters!

Interested in ordering live lobster online, but unsure of what size to buy? Here are some tips on what size lobster to order.

Lobster Anatomy Quick FAQS

A Maine lobster has how many body parts?

A Maine lobster has 19 body parts!

What color is the lobster’s blood?

Lobster’s blood is colorless and when exposed to oxygen it tuns a tint of blue. The blue hue is due to iron the lobster’s body used to transport oxygen. Human’s red colored blood is due to iron being the oxygen carrier.  When lobsters are cooked the blood turns to a white, opaque color and has a gel like consistency.  It is safe to eat.

What is the red stuff in the lobster?

The hard red substance is the roe or the eggs of the female lobster.  It is also called the coral because because of the deep red color . The roe will be black and will appear gelatin-like if your lobster is under-cooked. It is edible but can also be rinsed out. Learn more about what’s inside a lobster.

What’s that Green Stuff in the lobster?

The green substance is the liver, also known as tamale. It can be rinsed out of the cooked lobster.

Why is my lobster is missing a claw?

On occasion a lobster will drop its claw as a defense mechanism. This can happen in shipping and in the wild. Lobsters will battle other lobsters over territorial rites.
A lobster with only one claw is called a Cull and are often a good deal at the local lobster pound.
It can take several molts for a lobster to grow back its claw. If your lobster arrives alive it is fine to cook up the lobster and its dropped or broken off claw.

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