Crayfish External Anatomy

Crayfish are freshwater crustaceans in the order ‘decapod’ meaning ten+foot. As we finish our journey through arthropods, we notice many similarities between them. The exoskeleton, jointed legs, segmented body, antennae, and carapace are just a few. The students observed both a preserved specimen and a live marbled crayfish. They followed a lab procedure sheet that guided them through all the characteristics that the crayfish uses for obtaining energy, protection from predators and reproduction. The movement of the swimmerets and maxillipeds (mouth parts) were easy to observe on the young crayfish in the beaker.

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