Introduction: Crayfish belong come the Kingdom Animalia which has all organisms that need to consume your food (heterotrophs) and also are multicellular. Within this kingdom space subgroups, known as phyla. The crayfish belongs come the Phylum Arthropoda, which contains organisms that have an exoskeleton, jointed appendages and also segmented bodies. In fact, words "arthropoda" way "joint-foot".

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Crayfish have two key body areas: the cephalothorax, which is composed of the head and also upper body, and also then the abdomen, i beg your pardon is plainly segmented. Friend can find appendages top top both areas.

Head

Focus on the head, girlfriend may notice small appendages roughly the mouth. These are referred to as the MAXILLIPEDS, and also there are three sets, one on peak of the other. On the photo below you deserve to see the topmost maxillipeds. These appendages aid the crayfish manipulate food.

The MANDIBLES the the crayfish are similar to the jaws of humans. They are solid and have the right to break the difficult shells of numerous aquatic animals. Crayfish deserve to eat fish, various other invertebrates prefer crabs and also shrimp. Lock are generally carnivorous and also can injury fish in your tank if you shot to keep them together pets. The amazing thing around mandibles is the unlike human being jaws, the jaws the the crayfish open up from side to side.

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The head also has a collection of eyes the are an installed on stalks referred to as PEDICLES. If you clock a live crayfish, you have the right to see the eyes relocate independently. The crayfish also has two sets that ANTENNAS that help them gather information around their environement. The smaller set is dubbed the ANTENNULES.

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Cephalothorax

The cephalothorax as viewed in the above picture makes increase the crayfish"s midsection. Over there is a challenging armor that covers the an important organs and part of the head, this component of the exoskeleton is referred to as the CARAPACE. Note how the carapace extends end the head and also between the eyes, this framework is referred to as the ROSTRUM.

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Abdomen

The abdomen is flexible and the segment is clearly shows here. The appendages of the crayfish connect to both the cephalothorax and the abdomen. The appendages that affix to the thorax are called WALKING LEGS and you can see how they room jointed in the number below. The smaller sized appendages attached come the segments of the abdomen are referred to as SWIMMERETS. The picture shows a female crayfish; in males the very first set the swimmerets space enlarged because that grasping the female during copulation.

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Notice the big claw ~ above the crayfish. This claw is referred to as the CHELIPED, that is additionally jointed and also the crayfish uses it to record food and for defense.

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The very last segment that the crayfish is a one-of-a-kind segment dubbed the TELSON, which has fan-like fin that expand to either 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 can it is in suprisingly challenging to catch.

Observe this video clip of a crayfish swimming:


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