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Crayfish have two main body sections: the Cephalothorax and the Abdomen.if you want more info here is a web site:http:/izzperiodzcarnegiemnhzperiodzorg/crayfish/Keys/SectionVIIIzperiodzhtm#S
arachnid
Crayfish are classified as arthropods, because of their characteristic segmented bodies, chitinous exoskeleton, and joint appendages.
a crayfish body is smooth. only its tail has little bumps
A crayfish's body is smooth. Only it's tail has a little bumps.
A crayfish is not a fish because they have bones on the outside of their body fish don't.
two
Crab, shrimp, and lobsters are in the same phylum as crayfish. They are all in the arthropoda phylum. Arthopods have an exoskeleton, a segmented body, and jointed appendages.
A crayfish has segments, which are sections of a body that are separated by a crease, so it might be determined as segmented because it has only two so it may be classified but it might not. Worms have many segments.
A crayfish's heart works like a humans. it pumps blood through the body.