5/25/2023 0 Comments Japanese spider crabReproductive and social behaviour sometimes include complex mating rituals and communication techniques such as drumming or waving the pincers.Ĭrabs tend to be aggressive towards one another and the males often fight to gain access to the females.īelow is a list of different species of crabs from different parts of the world. Their sense of smell and taste are also more advanced which helps them to find food and mates easier. Crabs can live in more extreme areas because of their ability to adapt well to the changing environment.Ĭrabs can see fairly well with their compound eyes. However, in the marine community, they are known to be gentle giants. At first glance, they look like ancient monsters that have crawled straight out of a sci-fi movie. ![]() Crabs can possess fairly complicated nervous systems and are considered to be more advanced. The Japanese spider crab is a giant crustacean that can grow up to 12.5 feet that is most commonly found on the Pacific side of Japan. The premolt, postmolt carapace width and the growth rate of the crab were 12.81 cm, 15.60 cm and 21.8, respectively. The time of molting behavior was approximately 103 min. The pincers of a crab, called chelae, are located on the front legs and are used for fighting, display and feeding. The 2nd and the 1st (the longest limbs for a female) walking legs are withdrawn. A crabs segmented body has several pairs of appendages, of which usually five pairs serve as walking legs and two as sensory antennae. This reduction is greatest among the ‘true crabs’, which lack the flaplike tail of the hermit crabs and their allies instead, the abdomen serves as a brood pouch for the eggs. The body of a crab is covered by a chitinous shell called a carapace.Ī crabs abdomen has become fairly reduced and is tucked under the body. ![]() However, crabs have evolved so that they can walk or run sideways, as well as burrow and swim. There are almost 5,000 different species of crabs, about 4,500 are true crabs, plus around 500 are hermit crabs (hermit crabs do not have a very hard shell and use other animals old shells for protection). Crabs are crustaceans and related to lobsters and shrimps.
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