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BIOL212

Majors animal: External anatomy of the crayfish (matching)

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