For many crabs, a mixed diet of plant and animal matter results in the fastest growth and greatest fitness. They eat algae and other plant matter as well as hunting animal prey. The Thomisidae are a family of spiders, including about 175 genera and over 2,100 species. :96, Crabs are mostly active animals with complex behaviour patterns. Some crabs, though, such as the coconut crab, have big, strong pincers that are strong enough to break a person’s finger. So which breeds fit these needs? With over 6,700 species of crab worldwide, their overall numbers are considered large but unknown for most species. The heaviest crab ever found was a king crab, which weighed in at an amazing 28 pounds, about the same weight as a corgi or a miniature poodle. Some scientists decided in 2005 that crabs are unable to feel pain. People continue to call them crabs because they live in salt and brackish water and act a lot like crabs, but they aren’t. Most crabs belong to the Brachyura family. Mud crab scientific name is Scylla serrata which known as one of the most popular crab to be consumed due to the incredible big size and nice taste. Many aquatic crabs mate belly to belly and the eggs are fertilized internally. They will even attack small animals such as dogs and cats if they encounter them.One type of crab, the horseshoe crab, is actually not a crab at all. This helps to keep the populations healthy so that there will continue to be plenty of crabs. Synonym: Carpiliuss maculatus, Cancer maculatus.  However, some crabs walk forwards or backwards, including raninids, Libinia emarginata and Mictyris platycheles. Plus, they must be comfortable in smaller spaces and able to saunter through crowded city streets on a leash — or in a bag — without freaking out. A crab’s color can help to protect it by offering it some camouflage. Regulating the amount of crab caught each season helps to control their numbers and make sure that crab continue to be around in the future. This protects the crab during most of its life, but because the exoskeleton can’t grow with the crab it must be shed, typically once per year, to allow the crab to grow. Mud crab scientific name is Scylla serrata which known as one of the most popular crab to be consumed due to the incredible big size and nice taste. The infraorder Brachyura contains 6,793 species in 93 families, as many as the remainder of the Decapoda. Crabs are very important to the environment because they help to keep things clean. It is named for the former small town of Dungeness on the Olympic Peninsula in Washington state, which first began commercially harvesting the delicacy. The moult cycle is coordinated by hormones. The word Brachyura comes from the ancient Greek terms for short, “brachys”, and tail, “oura.” However, not all crabs belong to this family, and some of the better-known species, such as the king crab, are in the Lithodidae family. They have an irregular, rounded shape and a wide, spreading canopy. Crabs tend to be aggressive towards one another, and males often fight to gain access to females. The tiny pea crab spends its life as a parasite inside of oysters, mussels, sand dollars, sea cucumbers, and other creatures where it consumes plankton that the host brings in to feed itself.  The free-swimming tiny zoea larvae can float and take advantage of water currents. When fertilisation has taken place, the eggs are released onto the female's abdomen, below the tail flap, secured with a sticky material. These crustaceans belong to the decapod family, and there are around five hundred (500) species of these crabs worldwide.Most hermit crabs are aquatic, but there are also some species that can live in the sand on the shore of beaches. Newborn crabs lack a shell and usually live like free-floating plankton where they are a target for all kinds of predators, including tiny fish, corals, anemones, sea worms, and the young of most kinds of animals. The crab can be found mostly in the estuaries as well as … Crabs attract a mate through chemical (pheromones), visual, acoustic, or vibratory means. The largest crab is the Japanese spider crab, which can grow as much as 13 feet (4 m) wide when its legs are spread – about the length of a Volkswagen. :113–114, Once crabs have become juveniles, they still have to keep moulting many more times to become adults. , They are found throughout the world's tropical and semitropical regions. They have a spine, which probably reduces the rate of predation by larger animals. It is an important species for fish industry because it sold in high price. Fiddler crab, any of the approximately 65 species of the genus Uca (order Decapoda of the subphylum Crustacea). Mud crab scientific name is Scylla serrata which known as one of the most popular crab to be consumed due to the incredible big size and nice taste. The crab can be found mostly in the estuaries as well as … In addition to being called red king crab or Alaskan king crab, it may also be referred to as Kamchatka crab or Japanese crab. They live in all the world's oceans, in fresh water, and on land, are generally covered with a thick exoskeleton, and have a single pair of pincers. This large crab usually weighs in from 1 3/4 to 4 pounds and is brown to purple in color. This is a difficult process that takes many hours, and if a crab gets stuck, it will die.  On rocky seashores, where nearly all caves and crevices are occupied, crabs may also fight over hiding holes. Both claws in the female are relatively small. , In some crab species, meat is harvested by manually twisting and pulling off one or both claws and returning the live crab to the water in the belief the crab will survive and regenerate the claws.. The fertilized eggs are placed on her underside, near her tail, and carried there until they hatch. 1 decade ago. In males, claws can be Yet, they all belong to the scientific order Decapoda, which comes from the Greek words “deka” meaning ten, and “pous” (poda), meaning feet. Common name: crab apple. Latin name Cancer magister, Dungeness crab is found in coastal waters from Alaska to Baja, Mexico. :28–29, 99, Crabs are omnivores, feeding primarily on algae, and taking any other food, including molluscs, worms, other crustaceans, fungi, bacteria, and detritus, depending on their availability and the crab species. These strange creatures receive the scientific name of Bernhardus Pagurus, but they are better known as hermit crabs (INT) or soldier crabs. Surprisingly, their closest living relatives are not other crabs, but spiders. If you want a feminine name for your crab, take a look at a few that might work. The release is often timed with the tidal and light/dark diel cycle. Lv 7.  Some crabs, notably the Portunidae and Matutidae, are also capable of swimming, the Portunidae especially so as their last pair of walking legs is flattened into swimming paddles.