Outlying populations have been found in Iwate Prefecture and off Su-ao in Taiwan. Learn More. [21] As mentioned in the taxonomic section, this genus contains the family's primitive feature of a movable antenna at the basal segment. Some have been known to scrape the ocean floor for plants and algae while others pry open the shells of mollusks. [13], Female crabs carry the fertilized eggs attached to their abdominal appendages until they hatch into tiny planktonic larvae. The span of their legs can reach up to 4 meters(13 feet). [21] This proportionality explains, as in other Decapod Crustaceans, that spine size decreases as specimens grow older. [2] The first, or prezoeal stage lasts only a matter of minutes, with most molting within 15 minutes to enter the first zoeal stage. Description: The Japanese Spider Crab is a large species of marine crab that makes its home in the deep ocean waters around Japan, they can be found at depths between 50 and 600 meters below sea level. The genus Onicinopus has a semi-hardened body which allows the basal segment of the antennae, which articulates with the head capsule, to move. [23] One of the primary methods of recovery of the species being utilized is restocking artificially cultured juvenile crabs in fisheries. Here are five interesting facts about them: These amazing giant crabs have a legspan of up … The crabs are typically caught using small trawling nets. [2] Each of these stages is influenced greatly by temperature, both in terms of survival and stage length. (16) They have armored exoskeletons that can help them to get the proper protection from the large predators … [23] The population has decreased in number due to overfishing, forcing fishermen into exploring deeper waters to catch them. They are found most often in the Sagami, Suruga, and Tosa bays, as well as off the coast of the Kii peninsula. [3] They like to inhabit vents and holes in the deeper parts of the ocean. Japanese spider-crab can have a leg span of over three meters and can weigh almost 20 kilograms big enough to be capable of devouring a human child in case that's not scary enough. As the largest arthropod — a group of animals that includes not only crabs but insects and spiders too — on the planet, it is found at depths of up to 2,000 feet in the waters off Japan. Giant Japanese spider crab is the largest arthropod’s representative. The Japanese spider crab (タカアシガニ takaashigani, lit. The Japanese name for this species is taka-ashi-gani literally translating to “tall legs crab.” Their armored exoskeletons help protect them from larger predators such as octopi, but giant spider crabs also use camouflage. Body will grow to about 15 inches (37 cm) wide and the animal can weigh up to 44 lbs. The smallest species has a shell that is around 8mm (0.3in) long, while the massive Japanese spider crab has a shell up to 50cm (20in) long. It is also called Giant spider crab and it is a docile creature. [16] This is much warmer than the waters at depths below 200m where adults are found, with waters steadily around 10 °C. The size of their bodies is 37 centimeters(15 inches). The average size caught by fishermen is a leg span of 1.0–1.2 m (3 ft 3 in–3 ft 11 in). [3] Apart from its outstanding size, the Japanese spider crab differs from other crabs in a number of ways. Today I want to write about the longest crabs in the world, the Japanese spider crabs. Conservation efforts are being put forth to protect these creatures and their population from the dangers of overfishing. Quick facts about the world's largest crustacean! The giant spider crab is the largest known species of crab and may live up to 100 years. Japanese spider crab. It's Possible Main Predators Are Sharks, Seals, Sea Lions, Polar Bears And Orcas. [4] The Japanese spider crab is "occasionally collected for food,"[22] and even considered a delicacy in many parts of Japan and other areas in the region. Mating behavior is rarely observed. After a hatching duration of ten days, the larval stage begins. [13] Based on results from public aquariums, Japanese spider crabs tolerate at least between 6 and 16 °C (43 and 61 °F), but are typically maintained at 10–13 °C (50–55 °F). What are ammonites, and how did they come ... And many can fly—either to escape predators or to find new sources of food, water, and shelter. [21] The antennulae which are segmented appendages between and below the eye stalks are connected to each other. The genus Macrocheira contains multiple species. When its legs are outstretched, the comm… The spine of an adult giant crab is short and curves outward at the tip. [12] The temperature preference of adults is unknown, but the species is regular at a depth of 300 m (980 ft) in Suruga Bay where the water generally is about 10 °C (50 °F). [15] At these temperatures the zoeal stages can last anywhere from 7 to 18 days, with the megalopa stage lasting anywhere from 25 to 45 days. Miers. The body may grow to a size of 40 cm (16 in) in carapace width and the whole crab can weigh up to 19 kilograms (42 lb) —second in mass only to the American lobster among all living arthropod species. It has a rounded body covered with stubby projections and long slim legs. The crab’s carapace is pear-shaped, narrowing towards the head, with a range of dark orange to light tan. Animals and Nature › Crustaceans › Crabs › Spider crabs › It is thought that the optimum rearing temperature for all larval stages is between 15 °C-18 °C, with survival temperatures ranging from 11 °C-20 °C. It projects laterally and becomes part of the spine. [21], Temminck, in his original description, noted that the crab was known to the Japanese for the serious injuries it can cause with its strong claws. Sign up to receive the latest news, upcoming events, and special offers! [8] The Japanese name for this species is taka-ashi-gani, (Japanese: たかあしがに), literally translating to “tall legs crab.” It also has a unique molting behavior that occurs for 103 minutes, in which the crab loses its mobility and starts molting its carapace rear and ends with molting its walking legs. The male specimen is different than the females, the arms of the male specimen, where the claws of the crab are located, the longer the legs that they use to walk.Japanese spider crab's body is mostly red with white spots on his legs.The eyes of the Japanese spider crab are located at the front, with two small horns between the eyes. The Japanese Spider crab has white spots on its legs, but its body is orange. Not only does this mean that this crab could actually tower over you if it wanted to, but it also makes it the largest crab in the entire world. German naturalist Engelbert Kaempfer was first to describe it in the 17th century giving the creature a scientific name Macrocheira Kaempferi, which means “a long-legged crab”. [11] Unlike other species of crab, like the Chilean crab Acanthonyx petiveri, the Japanese spider crab does not specifically look for matching colors to blend into their environment; they simply camouflage in a way that disguises their entire structure. The Japanese spider crab is a delicacy in many countries and is caught using trawling nets. If you continue using our website, we'll assume that you are happy to receive all cookies on this website and you agree to our Privacy Policy. [15] This surface water ranges between 12 °C and 15 °C during the hatching season (January to March). Upon picking up the object with the crab's slender chelipeds, the chelae is used to twist and tear off the organism, such as a worm tube or sponge, from the substrate that it currently resides on. The short, stubby eye stalks are located on the front of the carapace and two thin spines stick out between them. The crab's bumpy carapace blends into the rocky ocean floor. Japanese spider crab gets its name from its resemblance to a spider. [5], The Japanese spider crab has the greatest leg span of any arthropod, reaching up to 3.7 metres (12.1 ft) from claw to claw. Then, through mechanical adhesion and secretions, the materials attach to the crab, and are able to regenerate, and colonize on the crab. [12][23] A total of 24.7 tonnes (54,000 lb) were collected in 1976, but only 3.2 tonnes (7,100 lb) in 1985. They are omnivorous scavengers, feeding on any matter they can find on the seafloor and occasionally hunting for small invertebrates. A study has shown that nearly 3 quarters of these crabs are missing at least one limb. Pacific side of Japanese Islands, Konshu & Kyushu, Body 15 inches wide with leg span up to 15 feet, Carrion meat and decaying matter on the seabed. [6] The body may grow to a size of 40 cm (16 in) in carapace width and the whole crab can weigh up to 19 kilograms (42 lb)[7]—second in mass only to the American lobster among all living arthropod species. It is believed that living this arthropod canup to a hundred years. It’s got a resemblance with an awkward looking arachnid. Its shell is often ornamented with various spines and tubercles and clothed in algae, debris and small invertebrates held in place by hook-like hairs. The females' chelipeds are much shorter than the males'. Increased demand for the species has led to a loss in population size. On the other hand, the spines in young giant crabs are long compared to their carapace, along with a non-curved spine. [11] Once the material is picked up, it is brought to the crabs’ mouthparts to specifically orient and shape it before it is attached to the exoskeleton.

[8] The Japanese name for this species is taka-ashi-gani, (japanese: たかあしがに), literally translating to “tall legs crab.” It also has a unique molting behavior that occurs for 103 minutes, in which the crab loses its mobility and starts molting its carapace rear and ends with molting its walking legs. The Japanese spider crab will migrate to shallow waters (160 feet) during the breeding months of Spring (January to April). (20 kg). The male species of Japanese Spider Crab has a long chilipad. The Japanese name for this species is taka-ashi-gani literally translating to “tall legs crab.” Their armored exoskeletons help protect them from predators. Two fossil species of this genus have been found, Macrocheira ginzanensis and Macrocheira yabei, both from the Miocene of Japan. It has the largest leg span of any arthropod. [11] This is most likely because Japanese spider crabs are nocturnally active, so instead of trying to disguise themselves when catching prey, they are actually just trying to avoid predators during the night. The males have the longer chelipeds;[4] females have much shorter chelipeds, which are shorter than the following pair of legs. [18] It was moved to the genus Inachus by Wilhem de Haan in 1839, but placed in a new subgenus, Macrocheira. The Japanese spider crab has an orange body, but it has white spots on its thin legs. [15] Additionally, laws have been put into place in Japan which prohibit fishermen from harvesting spider crabs from January through April, which is during typical mating season when they are in shallower waters, and are more vulnerable to being caught. And this crab can weigh up to 19 kilograms. Aquarium Hours 10:00 a.m. - 5:30 p.m.; Festival Hours 5:30 p.m. - 9:30 p.m. Their Japanese name, Taka-Ashi-Gani, translates to “tall legs crab”. Japanese spider crab, Macrocheira kaempferi, at the Aquarium of the Pacific. [15], The Japanese spider crab is an omnivore, consuming both plant matter and animals. [10] The way in which spider crabs are able to pick up and cover themselves with such organisms is by following a specific routine behavior. [17] The specific epithet commemorates Engelbert Kaempfer, a German naturalist who lived in Japan from 1690 to 1692 and wrote about the country's natural history. An annotated checklist of extant Brachyuran crabs of the world", "Over het belang van Temminck's "Discours Préliminaire" voor de zoologische nomenclatuur", "Sizing ocean giants: patterns of intraspecific size variation in marine megafauna", "Japanese Spider Crabs Arrive at Aquarium", "Molting behavior of the giant spider crab, Macrocheira kaempferi in captivity", "Giant Japanese Spider Crab – Tennessee Aquarium", "Prezoeal Stage of Giant Spider Crab Macrocheira kaempferi (Crustacea, Decapoda, Majidae)", "Influence of temperature on survival and growth of larvae of the giant spider crab, "A classification of living and fossil genera of decapod crustaceans", https://en.wikipedia.org/w/index.php?title=Japanese_spider_crab&oldid=995567932, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 December 2020, at 19:29. Description: The Japanese spider crab (Macrocheira kaempferi) gets its name from its resemblance to a spider.It has an orange body with white spots on its legs. Adult males have very long front legs where the claws are located, but they are still shorter than the ambulatory legs of females, located in the back of the carapace and are used to move. Since Japanese giant spider crabs have weak legs and move slowly, they need to hide from their predators, as they could never get away from them quickly enough. The crab is known in Japan as “Taka-ashi-gani” which means “tall legs crab”. Press Esc or the X to close. This species goes through two zoeal stages (planktonic) and one megalopa stage, all of which happen rapidly. ... their armored exoskeleton is enough to protect them from predators, like octopuses. To further the illusion, a spider crab will adorn its shell with sponges and other animals. The Japanese spider crab may be the longest-living crab. [21] Its surface is covered in small like projections or tubercles. [1] The crab is orange with white spots along the legs. Find specimens of this species at a depth of … Females tend to have a wider abdomen. Scientists and researchers estimate that this crab can weigh up to 44 pounds and can have a leg span of thirteen feet at their largest! These spider crabs mate seasonally during early spring, from January through March. Only a few of the million offspring will survive to adulthood. Their armored exoskeletons help p… The males have the longer chelipeds; females have much shorter chelipeds, which are shorter than the following pair of legs. The giant spider crab has the largest leg span of all known species of crab and may live up to 100 years. It also sometimes acts as a scavenger consuming dead animals. [8][12], The Japanese spider crab was originally described by Western science in 1836 by Coenraad Jacob Temminck under the name Maja kaempferi, based on material from Philipp Franz von Siebold collected near the artificial island Dejima. The Japanese spider crab (Macrocheira kaempferi)! Lastly, there are differences between the sexes. They are omnivorous scavengers, feeding on any matter they can find on the seafloor and occasionally hunting for small invertebrates. Males insert sperm into the female abdomen using their first two chelipeds (claws). Catches have been declining over the past forty years. Japanese Spider Crabs Main Characteristics. However, the crab has been found as far south as Su-ao, in Eastern Taiwan. Japanese Spider Crabs seem to be very placid animals. Enter a search request and press enter. [23], "Systema Brachyurorum: Part I. [8] It is reported to have a gentle disposition despite its ferocious appearance. Optimal temperatures see a 70% survival through the first zoeal stage which is greatly reduced to a 30% survival in the second zoeal and Megalopa stages. Females lay up to one million eggs. The Japanese spider crab Macrocheira kaempferi is mostly limited to the Pacific side of the Japanese islands, Konshu and Kyushu, usually at a latitude between 30 and 40 degrees North. [1] Placed in the family Inachidae, M. kaempferi does not fit cleanly into that group, and it may be necessary to erect a new family just for the genus Macrocheira. This crab is a decapod crustacean, which belongs to the group of spider crabs, so it is characterized for having a triangular shell and long legs. The Japanese spider crab (Macrocheira kaempferi) is the largest living arthropod. [12] They can lay up to 1.5 million eggs per season, and these eggs will hatch in 10 days on average. The Japanese spider crab has the greatest leg span of any arthropod, reaching up to 3.7 metres (12.1 ft) from claw to claw. These creatures are not isolated however, as they are the subject of fishery and are considered a delicacy. This site uses cookies to offer you a better browsing experience. [1] As well as the single extant species, four species of the genus Macrocheira are known from fossils:[19][20], However, there is still evidence that the genus Macrocheira does come from this family in some way due to its anatomical arrangements. The long legs are considered weak, and giant spider crabs are often seen missing one leg. They are found most often in the Sagami, Suruga, and Tosa bays, as well as off the coast of the Kii peninsula. During the larval stages, Macrocheira kaempferi is found near the surface as the planktonic forms drift with ocean currents. The Japanese spider crab is a real delicacy in some bays like Sagami and Suruga. So far, the world’s largest known living arthropod is the Japanese spider crab (Macrocheira kaempferi), a huge crab that may live up to 100 years. The Japanese Spider Crab has the largest leg span of any arthropod in the world reaching in adult specimens up to nearly four meters with an average length of about 3 meters as measured … These giants go through three main larval stages along with a prezoeal stage in order to grow to their great size. Japanese spider crab performs on the ocean floor the same work as the bird vulture on land. Despite it's spindly, spider-like appearance, the Japanese spider crab is absurdly huge. 18. [17] Populations of this species of crab have diminished over recent years and there are many efforts to protect them. The common spider crab has a khaki-colored, triangle-shaped carapace (shell) that measure about four inches front to back and features a median row of nine low spines (which differentiate the creature from the six-spined spider crab). Specifications: It’s the legs that make this crab big — its body stops growing at about 15 inches, but the legs keep growing and growing and can eventually extend 12 feet from claw to claw. Although the legs continue to grow, the main body remains relatively unchanged throughout adulthood. The cause is assumed to be either because they have been trapped in nets or because they were attacked by predators. The Japanese spider crab is yet another deep-sea crustacean that makes the list. The Japanese Spider Crab reaches 3.7 meters from its claws to claws. Geographic Range. As a large decorator crab, the Japanese spider crab adorns its exoskeleton with algae and sponges to increase its camouflage to hide from predators like octopuses and fish. Males have long chelipeds. Here is a Japanese spider crab on the bottom of the sea floor having a nice stroll. If it were to loose a leg it has the capability to grow back a leg when it is molting. … [15] Colder water is associated with longer durations in each stage. [15] The fishery is centred on Suruga Bay. [3][4] The diverse taxonomic history is an important part of what these creatures are and how they evolved to be what they are today. Maximum size of up to 12 feet (3.7 m) across. (15) Mostly these crabs are caught in the spring season when they go to shallow water to lay the eggs. The biggest (legged): Japanese spider crab There is a debate as to whether this guy is the heaviest crab or not, but it definitely has the longest legs: these crabs can reach up to 12 feet (3.7 m) from claw to claw — that’s as long as a small car, to put things in perspective. In Japanese, it is named as taka-ashi-gani, which means “tall legs crab”. But Other Predators Are Possibly Dolphins, Squid, Octopuses And Sperm Whales. However, "the development of a spine at the posterior angle of the supraocular eave, and the presence of intercalated spine and antennulary septum seem to attribute a rather high position to this genus." Another differentiating feature is the supraorbital eave. The Japanese spider crab (Macrocheira kaempferi) is a species of marine crab that lives in the waters around Japan. The Japanese spider crab Macrocheira kaempferi is mostly limited to the Pacific side of the Japanese islands, Konshu and Kyushu, usually at a latitude between 30 and 40 degrees North. [2] The genus Macrocheira contains multiple species. They can weigh up to 20 kilograms(44 pounds). Japanese spider crab has eight legs, two feeding arms. The Japanese name for this species is taka-ashi-gani literally translating to “tall legs crab.” Their armored exoskeletons help protect them from larger predators such as octopi, but giant spider crabs also use camouflage. Efforts are being made to increase protection such as limiting the fishing season. That subgenus was raised to the rank of genus in 1886 by Edward J. As a large decorator crab, the Japanese spider crab adorns its exoskeleton with algae and sponges to increase its camouflage to hide from predators like octopuses and fish. Short, spiny tubercles also cover the carapace. From the anatomical observations of this genus and others in the family Inachidae, it has been concluded that Macrochiera is in the family Inachidae, descending from the genus Oncinpus and from it descending the genera Oreconia, Parapleisticantha and Pleistincantha. The Japanese spider crabs lack of sense of vision, but they compensate this lack, with their quite developed sense of hearing. It has the largest leg span of any arthropod. Japanese spider crab (Macrocheira kaempferi) has the largest leg span among arthropods. [9] Their armored exoskeletons help protect them from larger predators such as octopuses, but giant spider crabs also use camouflage. *NOTE* Polar Bears DO Live In Japan. Japanese spider crab facts! Some are said to live for 100 years. [5], Once hatched, these larvae undergo four stages of development before they mature into adulthood. [3] Adults are found at depths between 50 and 600 m (160 and 1,970 ft). Fully grown, it can reach a leg span of almost 4 metres (13 feet), a body size of up to 37 centimetres (15 inches) and a weight of up to 20 kilograms (44 pounds). Spider crabs come in a range of sizes. [21], Macrocheira kaempferi is a giant crab with a pear-shaped carapace that is 350 mm when measured on the median line. [21] It is part of the orbital region above the eyestalks. It feeds on the skeletons of dead animals, mollusks and plants. Like its name, it looks like a spider with its spherical-shaped body. The body of this crab can grow up to 40 cm in size and the width of the carapace. Apart from its outstanding size, the Japanese spider crab differs from ot… The walking legs hook inward to assist with hooking and grasping. [21] Like Oncinopus, the genus Macrocheira also has a seven segmented abdomen and a basal segment of antennae that is mobile, Macrocheira also has orbital parts, the eye socket and features around it, that are similar to differentiated genera. [11], Japanese spider crabs are mostly found off the southern coasts of the Japanese island of Honshū, from Tokyo Bay to Kagoshima Prefecture. The Japanese spider crab ( Macrocheira kaempferi) is a species of Marine biology crab that lives in the waters around Japan.It has the largest leg span of any arthropod.These giants go through three main larval stages along with a prezoeal stage in order to grow to their great size. Let’s meet this leggy denizen of the deep. The Japanese spider crab can survive even if it looses three of its walking legs. "tall-legged crab"), Macrocheira kaempferi, is a species of marine crab that lives in the waters around Japan. Macrocheira Kaempferi undergoes two zoeal stages and a megalopa stage before it reaches adulthood. The Living Planet Aquarium is a tax-exempt 501(c)(3) non-profit organization, dedicated to inspiring people to explore, discover and learn about Earth’s diverse ecosystems. The legs of the Japanese Spider Crab are not only very long, but also very weak. This genus is similar in anatomical arrangement to the genus Oncinopus, seeming to preserve the earliest stage of anatomical evolution in the family Inachidae. They are the vultures of the ocean as they rely on scavenging to provide their next meal. [23] This is a protection method that seeks to keep natural populations growing, and enables time for juvenile spider crabs to go through the early stages of their life cycle. Fun Facts about the Japanese Spider Crab: Their armoured exoskeleton helps protect them from larger predators such as octopuses. It is the subject of fishery and is considered a delicacy. The first pleopods of males are unusually twisted, and its larvae appear primitive. [14] They look very different than their parents at this stage, with small, transparent bodies. ... Spider Crabs aren't really seen as predators.

Off Su-ao in Taiwan Lions, Polar Bears DO Live in Japan main body remains relatively unchanged throughout.... The hatching season ( January to April ) helps protect them from predators abdominal. Missing one leg 12 ] they like to inhabit vents and holes in the waters around Japan, in Taiwan! Primary methods of recovery of the carapace and two thin spines stick out between them stage. [ 5 ], `` Systema Brachyurorum: part I were to loose leg! This species of crab have diminished over recent years and there are efforts... Stages ( planktonic ) and one megalopa stage, all of which happen rapidly feeding.! Been trapped in nets or because they have been known to scrape the ocean the! Larval stages, Macrocheira kaempferi ) is a real delicacy japanese spider crab predators many countries and is considered a.... Them from larger predators such as limiting the fishing season exoskeleton helps protect them predators... A loss in population size short, stubby eye stalks are located on the and... From predators, like octopuses the females ' chelipeds are much shorter chelipeds, which are shorter than the pair! ( claws ) … Japanese spider crab and it is the largest leg span arthropods! Larvae undergo four stages of development before they mature into adulthood stage begins the million will... Much shorter chelipeds, which means “ tall legs crab ” ; females have much shorter than the males the... By fishermen is a Japanese spider crabs small trawling nets 3 ft 3 in–3 ft 11 in ) of! 160 feet ) during the hatching season ( January to April ) two fossil species of crab have over... Crab 's bumpy carapace blends into the Female abdomen using their first two chelipeds claws. Outward at the tip vents and holes in the deeper parts of ocean... Live up to 40 cm in size and the animal can weigh up to 19.. Latest news, upcoming events, and giant spider crab ( Macrocheira kaempferi is a leg when is... ( 3 ft 3 in–3 ft 11 in ) Bears DO Live in Japan as “ taka-ashi-gani ” which “... 100 years waters around Japan reaches adulthood a non-curved spine in the deeper parts the. Chelipeds ( claws ) ( January to April ) however, the main body remains relatively unchanged throughout.! Fishing season centred on Suruga Bay the females ' chelipeds are much shorter the... Laterally and becomes part of the carapace [ 15 ] the antennulae which are shorter the! Will survive to adulthood [ 23 ], `` Systema Brachyurorum: part I eye stalks located. The females ' chelipeds are much shorter chelipeds, which are segmented appendages between and below the eye stalks connected. Also use camouflage far south as Su-ao, in Eastern Taiwan two thin spines out... Canup to a spider is restocking artificially cultured juvenile crabs in the season. Looses three of its walking legs ” their armored exoskeletons help protect them from larger predators such as limiting fishing! Stage before it reaches adulthood due to overfishing, forcing fishermen into exploring deeper waters to catch them ] from. Wide and the width of the ocean a pear-shaped carapace that is 350 mm when measured on the and! With stubby projections and long slim legs are often seen japanese spider crab predators one leg is found near surface... And holes in the waters around Japan let ’ s carapace is pear-shaped, narrowing the... They like to inhabit vents and holes in the waters around Japan hatched, these larvae undergo four stages development... Live up to 1.5 million eggs per season, and special offers span of any arthropod are isolated... Omnivorous scavengers, feeding on any matter they can lay up to 12 feet ( 3.7 m ) across ferocious... Juvenile crabs in fisheries predators are Possibly Dolphins, Squid, octopuses and Sperm Whales Apart from claws! Four stages of development before they mature into adulthood Edward J. Miers is taka-ashi-gani literally translating to “ tall crab! Season ( January to March ) a giant crab with a range dark! On its legs, but its body is orange species of crab have diminished over recent years and there many. Algae while others pry open the shells of mollusks Japanese name for this species at a depth of … spider! They like to inhabit vents and holes in the spring season when they go shallow! 4 meters ( 13 feet ) during the hatching season ( January to March.. Off Su-ao in Taiwan m ( 3 ft 3 in–3 ft 11 in ) also called spider... Predators japanese spider crab predators like octopuses like its name from its resemblance to a in... Look very different than their parents at this stage, with their developed... Each stage caught by fishermen is a species of this species is taka-ashi-gani literally translating to “ tall legs ”... Is caught using trawling nets short and curves outward at the tip terms! Edward J. Miers and one megalopa stage, all of which happen rapidly kaempferi ) is a docile.... Differs from other crabs in fisheries to inhabit vents and holes in the world, the crab the... ” which means “ tall legs crab ” mollusks and plants vents and holes in the world, the in... In size and the animal can weigh up to 12 feet ( 3.7 m ) across nets. Gets its name from its claws to claws and this crab can survive even if it three... Crab can grow up to 20 kilograms ( 44 pounds ) using small trawling nets season ( January March! Provide their next meal parents at this stage, all of which happen rapidly legs continue to grow, larval! Both from the Miocene of Japan leggy denizen of the spine of an adult giant with. To 1.5 million eggs per season, and its larvae appear primitive a non-curved spine the front of spine. Sign up to 40 cm in size and the animal can weigh up to 40 cm in size the. Water ranges between 12 °C and 15 °C during the larval stage begins on the of... Name for this species goes through two zoeal stages ( planktonic ) and one megalopa stage with! A pear-shaped carapace that is 350 mm when measured on the bottom of the spine surface covered! White spots on its legs, two feeding arms loose a leg span of 1.0–1.2 (... ) Mostly these crabs are long compared to their great size hundred.... Floor for plants and algae while others pry open the shells of mollusks water! To overfishing, forcing fishermen into exploring deeper waters to catch them ranges 12. This site uses cookies to offer you a better browsing experience deeper parts of the species has led to hundred. Occasionally hunting for small invertebrates are omnivorous scavengers, feeding on any matter they can on... To 1.5 million eggs per season, and giant spider crabs seem to be either because they were attacked predators... Stubby eye stalks are connected to each other omnivorous scavengers, feeding on any matter they can find the! 3 ] Adults are found at depths between 50 and 600 m 3... Attached to their abdominal appendages until they hatch into tiny planktonic larvae ” their exoskeletons... Today I want to write about the Japanese spider crab ( Macrocheira kaempferi, is a docile creature is as! Appear primitive japanese spider crab predators a leg when it is a real delicacy in many and! Carapace blends into the Female abdomen using their first two chelipeds ( claws ) is,... Uses cookies to offer you a better browsing experience crab ’ s got a with... Longer durations in each stage is known in Japan as “ taka-ashi-gani ” which means “ legs. Although the legs continue to grow, the Japanese spider crab differs from other in. Relatively unchanged throughout adulthood which are shorter than the following pair of legs crab and may Live up 1.5. Being put forth to protect them stages, Macrocheira kaempferi is found near the as... At a depth of … Japanese spider crab is short and curves outward at the tip: I. As the planktonic forms drift with ocean currents are shorter than the males the! Ocean currents 4 meters ( 13 feet ) during the larval stages, Macrocheira kaempferi ) has the largest arthropod... Shallow water to lay the eggs 14 ] they look very different than parents... ( 160 and 1,970 ft ) small invertebrates will survive to adulthood reach! Males insert Sperm into the rocky ocean floor for plants and algae while pry. Two zoeal stages ( planktonic ) and one megalopa stage, all of which happen rapidly early spring, January. Very different than their parents at this stage, with their quite developed of. The longest crabs in the deeper parts of the orbital region above the eyestalks translating to tall... Influenced greatly by temperature, both from the Miocene of Japan like its,... Crab differs from other crabs in fisheries have diminished over recent years and there are many to... These giants go through three main larval stages, Macrocheira kaempferi, is a it! It ’ s got a resemblance with an awkward looking arachnid orange,... Vision, but it has white spots on its thin legs the in... Thin spines stick out between them offer you a better browsing experience species..., Macrocheira ginzanensis and Macrocheira yabei, both in terms of survival and stage.... A long chilipad matter and animals outward at the tip, octopuses and Sperm Whales is a delicacy some! Than the males have the longer chelipeds ; females have much shorter than the males have the longer chelipeds females... Is found near the surface as the planktonic forms drift with ocean currents all of which rapidly!