Introduction: Crayfish belong come the Kingdom Animalia which has all organisms that have to consume their food (heterotrophs) and also are multicellular. In ~ this kingdom room subgroups, recognized as phyla. The crayfish belongs come the Phylum Arthropoda, which includes organisms that have an exoskeleton, jointed appendages and also segmented bodies. In fact, the word \"arthropoda\" method \"joint-foot\".

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Crayfish have actually two key body areas: the cephalothorax, which consists of the head and upper body, and also then the abdomen, which is plainly segmented. Girlfriend can find appendages top top both areas.

Head

Focus ~ above the head, friend may notice small appendages about the mouth. These are called the MAXILLIPEDS, and also there space three sets, one on optimal of the other. ~ above the photo below you have the right to see the topmost maxillipeds. These appendages assist the crayfish manipulate food.

The MANDIBLES that the crayfish are similar to the jaws of humans. Castle are solid and deserve to break the tough shells of countless aquatic animals. Crayfish have the right to eat fish, other invertebrates choose crabs and shrimp. Lock are typically carnivorous and also can harm fish in her tank if you try to store them as pets. The amazing thing around mandibles is that unlike human being jaws, the jaws that the crayfish open up from side to side.

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The head also has a collection of eyes the are placed on stalks dubbed PEDICLES. If you clock a live crayfish, you can see the eyes relocate independently. The crayfish also has two sets the ANTENNAS that assist them gather information around their environement. The smaller set is dubbed the ANTENNULES.

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Cephalothorax

The cephalothorax as checked out in the above snapshot makes increase the crayfish\"s midsection. Over there is a hard armor that covers the crucial organs and component of the head, this part of the exoskeleton is called the CARAPACE. Note how the carapace extends end the head and between the eyes, this structure is referred to as the ROSTRUM.

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Abdomen

The abdomen is flexible and the segmentation is visible here. The appendages the the crayfish attach to both the cephalothorax and the abdomen. The appendages that connect to the thorax are called WALKING LEGS and you deserve to see how they room jointed in the figure below. The smaller appendages attached come the segments of the abdomen are referred to as SWIMMERETS. The image shows a female crayfish; in males the very first set the swimmerets are enlarged because that grasping the female throughout copulation.

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Notice the big claw top top the crayfish. This claw is referred to as the CHELIPED, it is also jointed and the crayfish offers it to capture food and for defense.

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The an extremely last segment of the crayfish is a unique segment dubbed the TELSON, which has actually fan-like fins that prolong to one of two people side. Crayfish have the right to either go on the bottom the the s or lake, or use their urepods come propel them through the water. Crayfish are very fast and can be suprisingly difficult to catch.

Observe this video clip of a crayfish swimming:


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