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Japanese Spider Crab

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by

Megan Van Staden

on 16 April 2014

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Transcript of Japanese Spider Crab

Japanese Spider Crab
Introduction
The Spider Crab is one of the largest arthropod. The Spider Crab is known as a decorator crab because it picks up objects such as sponge and cement them to it's shell for camouflage that protects it from predators
External Structure
The Spider Crab has a rounded body covered with hooked hairs and long, slimy legs. It grows up to 3.7 meters. Its body grows 37cm wide and it weighs about 20kg. The male spider crab is always bigger than the female and has larger claws.
Functions
The Spider Crab is an Omnivore. It also sometimes acts as a scavenger. The Spider Crab scrapes the ocean floor for plants and algae and opens shell of Mollusks. The Spider Crab is Known as a delicacy in Japan.
Adaptations
The Spider Crab as lots of adaptations.Although they are not sensitive, the spider crab posesses antennae and antennules. These are used for touch, taste and balance. These crabs have 3 proccess in eating food. They are mandibles, maxillae and maxillipeds. The mandibles chew the food; the maxillae manipulate food and draw water over the gills; the maxillipeds manipulate the food. One of the most important adaptations is the Cheliped. This is a pincer like limb that is used for defense, locomotion and capturing food. Also at the end of each walking leg of a spider crab is a dactyls, which are moveable tips which allow the crab to climb and hook onto rocks. the 1 most impressive adaptations these crabs have is that they can regeneration, the ability to regeraye lost limbs.
Structure
The spider crabs pincers are used for protecting itself or defending itself. Their pincers are also used for capturing and eating its food.
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