Introduction: Crayfish belong come the Kingdom Animalia which includes all biology that have to consume your food (heterotrophs) and also are multicellular. In ~ this kingdom are 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" way "joint-foot".

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Crayfish have actually two main body areas: the cephalothorax, which consists of the head and upper body, and also then the abdomen, i beg your pardon is clearly segmented. Friend can discover appendages on both areas.

Head

Focus on the head, friend may notification small appendages about the mouth. This are referred to as the MAXILLIPEDS, and also there are three sets, one on optimal of the other. Top top the photo listed below you can see the topmost maxillipeds. This appendages aid the crayfish manipulate food.

The MANDIBLES that the crayfish are similar to the jaws of humans. They are solid and can break the tough shells of many aquatic animals. Crayfish can eat fish, various other invertebrates favor crabs and also shrimp. Lock are generally carnivorous and can harm fish in her tank if you try to keep them as pets. The interesting thing about mandibles is that unlike human jaws, the jaws that the crayfish open from next to side.

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The head also has a set of eyes that are placed on stalks called PEDICLES. If you watch a live crayfish, you have the right to see the eyes move independently. The crayfish additionally has two sets that ANTENNAS that aid them conference information about their environement. The smaller collection is dubbed the ANTENNULES.

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Cephalothorax

The cephalothorax as watched in the above picture makes increase the crayfish"s midsection. Over there is a hard armor that covers the crucial organs and part of the head, this part of the exoskeleton is dubbed the CARAPACE. Note how the carapace extends over the head and also between the eyes, this structure is dubbed the ROSTRUM.

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Abdomen

The abdomen is flexible and the segmentation is clearly shows here. The appendages that the crayfish attach to both the cephalothorax and the abdomen. The appendages that attach to the thorax are referred to as WALKING LEGS and you deserve to see just how they room jointed in the figure below. The smaller sized appendages attached come the segment of the abdomen are referred to as SWIMMERETS. The picture shows a woman crayfish; in males the an initial set of swimmerets room enlarged because that grasping the female during copulation.

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Notice the large claw top top the crayfish. This nipper is referred to as the CHELIPED, it is likewise jointed and also the crayfish supplies it to record food and also for defense.

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The really last segment of the crayfish is a special segment dubbed the TELSON, which has actually fan-like fin that expand to one of two people side. Crayfish can either to walk on the bottom of the s or lake, or usage their urepods to propel them through the water. Crayfish are really fast and also can it is in suprisingly challenging to catch.

Observe this video of a crayfish swimming:


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