Arthropod Anatomy and Functions

1. VOCAB ONLYArthropods

2. exoskeleton open Skeleton on the outside of the body ____________________ Circulatory system in which _____________________ Circulatory fluid is NOT contained in vessels Big pincher claw on a crayfish __________________ Ability to drop off a body part to escape a predator _______________________ cheliped autotomy

3. regeneration Ability to regrow a lost body part ____________________ Smaller feelers that sense touch, taste, and equilibrium ____________________ Part of the exoskeleton in a crayfish that covers the cephalothorax __________________ Type of larva with 3 pairs of appendages and one eye_________________________ antennules carapace nauplius

4. Compound eye An eye composed of many ____________________light detectors each with it own lens One of 10 bilaterally paired appendages on the abdomen of a crayfish that create watercurrents, transfer sperm (males) & carry young (females) ____________________ A heart shaped movable mouth part that functions in chewing in a crayfish ________________________ Blood in an animal with open circulation ______________________________ swimmerets mandible hemolymph

5. maxilliped Thoracic appendage in arthropods used to touch, taste, and manipulate food __________________ Larger segment made byfusing smaller sections together _____________ Structure through whichspiders release silk ________________________ Center section of acrayfish’s tail ____ tagma spinnerets telson

6. uropods Side sections of acrayfish’s tail ____________________ Carbohydrate found in theexoskeleton of arthropodsthat makes it flexible ____________________ Process of periodically shedding the exoskeleton toallow growth ________________________ chitin molting

7. Malpighian tubules Main excretory organ inmost insects and somemyriapods and arachnids _______________ An organ for gas exchange inthe abdomen of arachnidswith parallel folds that resemblea book ________________________ Free swimming larva seen in Crustaceans with 3 pairs ofappendages and one eye ___________________ Book lungs Nauplius

8. External fertilization Joining of egg and spermoutside the body ____________________ Organ for osmoregulationand excretion of nitrogenwaste in crayfish ____________________ Body system that useshormones to control other body systems ___________________ Green glands Endocrine

9. osmoregulation Maintaining the balanceof water and ions in the body ________________ Concentration of nervousand sensory tissue in theanterior end of an animal__________________ Ability to self-amputate body parts ________________________ Ability to regrow lost body parts _______________ cephalization autotomy regeneration

10. gills Respiratory organ thatexchanges gases with water__________________ Reproductive organ thatmakes sperm ____________________ General term forreproductive organs ___________________ Nerve center found in thehead ______________________________ testes gonads Cerebral ganglia

11. Vas deferens Small tubules that carrysperm to the exit __________________ Reproductive organ thatmakes eggs ____________________ Part of the exoskeletonthat covers the cephalothorax________ A pincer-like mouthpart insome arthropods like arachnids ____________ ovary carapace chelicera