Crab vs. Lobster
Main DifferenceThe main difference between the crab and lobster is the shape of their exoskeleton. The crab has a smaller circular exoskeleton, and the lobster is larger and longer.

Difference Between Crab and Lobster
Crab vs. Lobster
Crabs belong to infraorder Brachyura family whereas lobsters belong to the Nephropidae or Homaridae families.
Crab vs. Lobster
Crabs are less expensive as food. Conversely, lobsters are highly expensive and more delicious in taste.
Crab vs. Lobster
Crabs live in seawater, freshwater, and semi-aquatic conditions n the flip side lobsters are found in the ocean.
Crab vs. Lobster
The exoskeleton of crab is smaller and circular exoskeleton while the lobster has a larger and longer exoskeleton.
Crab vs. Lobster
Crabs usually walk sideways, on the other hand; lobsters move forwards and backward.
Crab vs. Lobster
Crabs can live up to thirteen years, and lobsters have a longer life span of about seventy years.
Crabnoun
A crustacean of the infraorder Brachyura, having five pairs of legs, the foremost of which are in the form of claws, and a carapace.
Lobsteradjective
red-colored, especially from a sunburn.
Crabnoun
(uncountable) The meat of this crustacean, served as food; crabmeat
Lobsternoun
A crustacean of the Nephropidae family, dark green or blue-black in colour turning bright red when cooked, with a hard shell and claws, which is used as a seafood.
Crabnoun
A bad-tempered person.
Lobsternoun
A crustacean of the Palinuridae family, pinkish red in colour, with a hard, spiny shell but no claws, which is used as a seafood.
Crabnoun
An infestation of pubic lice (Pthirus pubis).
Although crabs themselves are an easily treated inconvenience, the patient and his partner(s) clearly run major STD risks.Lobsternoun
A soldier or officer of the imperial British Army (due to their red or scarlet uniform).
Crabnoun
(slang) A playing card with the rank of three.
Lobsternoun
(slang) An Australian twenty dollar note, due to its reddish-orange colour.
Crabnoun
(rowing) A position in rowing where the oar is pushed under the rigger by the force of the water.
Lobsterverb
To fish for lobsters.
Crabnoun
A defect in an outwardly normal object that may render it inconvenient and troublesome to use.
Lobsternoun
flesh of a lobster
Crabnoun
The crab apple or wild apple.
Lobsternoun
any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae
Crabnoun
The tree bearing crab apples, which has a dogbane-like bitter bark with medical use.
Crabnoun
A cudgel made of the wood of the crab tree; a crabstick.
Crabnoun
A movable winch or windlass with powerful gearing, used with derricks, etc.
Crabnoun
A form of windlass, or geared capstan, for hauling ships into dock, etc.
Crabnoun
A machine used in ropewalks to stretch the yarn.
Crabnoun
A claw for anchoring a portable machine.
Crabnoun
The tree species Carapa guianensis, native of South America.
Crabnoun
Short for carabiner.
Crabverb
(intransitive) To fish for crabs.
Crabverb
To ruin.
Crabverb
(intransitive) To complain.
Crabverb
(intransitive) To drift or move sideways or to leeward by analogy with the movement of a crab.
Crabverb
(transitive) To navigate (an aircraft, e.g. a glider) sideways against an air current in order to maintain a straight-line course.
Crabverb
, to fly slightly off the straight-line course towards an enemy aircraft, as the machine guns on early aircraft did not allow firing through the propeller disk.
Crabverb
(rare) To back out of something.
Crabverb
(obsolete) To irritate, make surly or sour
Crabverb
To be ill-tempered; to complain or find fault.
Crabverb
(British dialect) To cudgel or beat, as with a crabstick
Crabnoun
decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers
Crabnoun
a quarrelsome grouch
Crabnoun
(astrology) a person who is born while the sun is in Cancer
Crabnoun
the fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22
Crabnoun
the edible flesh of any of various crabs
Crabnoun
infests the pubic region of the human body
Crabnoun
a stroke of the oar that either misses the water or digs too deeply;
he caught a crab and lost the raceCrabverb
direct (an aircraft) into a crosswind
Crabverb
scurry sideways like a crab
Crabverb
fish for crab
Crabverb
complain;
What was he hollering about?Comparison Chart
Crab | Lobster |
Decapod crustaceans that belong to the infraorder Brachyura | Marine invertebrate that belongs to the Homaridae or Nephropidae families |
Size | |
Smaller with smaller tongs and fewer legs | Larger with larger tongs and more legs |
Walk | |
Sideways | Forwards and backward |
Species | |
6,793 species | More than 500 species |
Life span | |
8 to 13 years | Around 70 years |
Crab vs. Lobster
Crab and lobster are the marine invertebrates belonging to the group of crustaceans. Crabs belong to infraorder Brachyura family. Lobsters belong to the Nephropidae or Homaridae families. There are around 6800 species of crab that inhabit terrestrial ecosystems and fresh and marine water. They can be found all over the world but especially abundant in subtropical and tropical areas. Lobsters are the less diverse group of animals that are found around the world. There are about 48 species of lobster found in the oceans (and occasionally brackish water) except in the polar regions. Lobster spend life on the sandy, rocky or muddy seafloor, usually on the edge of the continental shelf or near the coast. Crabs can be so small (smaller than an inch in diameter) or so large (leg span of 13 feet). Lobsters are larger than crabs. They are 10 to 20 inches long, but some species can reach 3.25 feet in length and 44 pounds of weight. The crab has a smaller circular exoskeleton. The lobster is larger and longer with a long tail which consists of most of its meat. Crabs also have a distinctive walk, and they tend to walk sideways. Lobsters move forwards and backward and also have larger claws as compared to crabs. Crabs have a thick exoskeleton, round (females) or triangular-shaped (males) abdomen, four pairs of legs and one pair of claws called chelae. Their eyes are located on the long eyestalks. Lobsters have an elongated body covered with a light-weight exoskeleton. They have five pairs of legs.
What is Crab?
Crab is the decapod crustaceans that belong to the infraorder Brachyura. Crabs are covered with a thick exoskeleton. It has a single pair of claws. Crabs are found all over the world. They are a prime form of seafood in most cultures. Crabs live in fresh water and on land, mainly in tropical regions. Crabs form about 93 families under the Brachyura and consists of about 6,793 different species. Its body is wide, and eyestalks hold eyes. Its tail and antennae are small and are almost unnoticeable. Crab has a pair of chelae or claws, and uneven legs which it uses to walk sideways. Male crabs mainly have larger chelae and a narrow pleon, or abdomen. Female crabs have smaller claws and around the abdomen to store their eggs. Crab provides delicious, juicy meat and is typically abundant in warm areas. Crabs can be so small as a few millimeters and so large as 13 feet. Their life span is up to thirteen years. Crab is the omnivorous crustaceans. The food of crab is algae, plankton, small fish, worms, fungi, mollusks, and even other crustaceans. The main feature of crabs is a large carapace that covers them. Their tail is hidden ventrally underneath the body. According to research, the crabs are cooperative creatures that work together to protect, feed, and find shelter for their families. However, they are also hostile towards each other. Male crabs fight other males to find their mating partner and hiding holes. Crabs can survive 8 to 13 years.
What is Lobster?
Lobster is a marine invertebrate that belongs to the Homaridae or Nephropidae families. It is a large crustacean with muscular tails, elongated bodies, and long antennae. Lobsters have five pairs of their walking legs, with the first pair larger than the rest. They are up to twenty inches long. Lobsters are omnivorous creatures that primarily eat worms, seashells, fish, seaweeds, and other crustaceans. They like to live alone in rocky, muddy crevices on the sea floor or in burrows. Lobsters have a long, muscular tail with fan-shaped tip and very long antennas that function as sensory organs in the murky waters. Lobsters are invertebrates with a hard protective exoskeleton made of chitin. Since they are arthropods, lobsters molt their exoskeleton to grow, shed their shell, and also change their color. They walk slowly using their legs, but they can swim backward quickly. Lobsters can survive for around 70 years. They have ten walking legs. The front three pairs have claws and the first of which is the largest. Lobsters have antennas on the top of their head that they use as sensors in the water and to communicate. Research suggests that lobsters may not slow down, weaken, or lose fertility with age, and instead, older lobsters may be more fertile than younger lobsters. They have an efficient sensory system with antennae and antennules. Lobster are mainly omnivorous in feeding habits and eat both phytoplankton and zooplankton. Lobster is famous for their delicious meat and is considered a delicacy in some countries. It is a highly priced food both as raw meat and as cooked food.
ConclusionCrabs and lobsters are the marine invertebrates belonging to the group of crustaceans. Both are different in their size, shape, structure, and organs. Both are eaten as food around the world but have a distinct taste from each other.