Majors animal: External anatomy of the crayfish (matching)
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| Rostrum | Pointed region between eyes demarcating anterior end of body
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| Compound eyes | Small, dark sense organs for detecting light and forming visual images
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| Antennae | Longer, paired appendages on head modified for chemosensory and tactile reception
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| Antennules | Shorter, paired appendages on head modified for chemosensory, tactile, and equilibrium reception
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| Maxillae | Two sets of short, paired appendages located on ventral surface near mouth used to hold food while the mandibles grind off bits and pieces to ingest
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| Mandibles | Hard, chitinous mouthparts used to grind food into the mouth
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| Mouth | Opening to digestive tract loacated on ventral surface of body
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| Chelipeds | Large pinchers used for grasping food and for defense
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| Walking legs | Locomotion (walking on land and crawling across stream bottom)
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| Swimmerets | Abdominal appendages modified for swimming
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| Copulatory swimmerets | Larger, club-shaped swimmerets used by male to transfer sperm during copulation
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| Uropod and telson | Broad, fan-shaped region of body used for rapid movement and for directional control during leisurely locomotion
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| Anus | Terminal point of digestive system located on ventral surface of telson
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