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ARTHROPODS “JOINTED-LEGS” ARTHROPODS ARE THE LARGEST GROUP OF ANIMALS ! WHO’S WHO? SHRIMP SPIDER CRAB ISOPOD BARNACLE LOBSTER BASIC CHARACTERISTICS • BILATERAL SYMMETRY • SEGMENTED ANIMALS – JOINTED BODY & PARTS AID IN MOVEMENT • EXOSKELETON MADE OF CHITIN • 1 WAY DIGESTIVE SYSTEM 2 OPENINGS (mouth – anus) • MUSCLES ATTACH INTERNALLY MAKING THEM VERY STRONG • OPEN CIRCULATORY SYSTEM (BLOOD COMES OUT OF VESSELS) Ostia Vein Capillaries • VENTRAL NERVE CORD & WELL DEVELOPED BRAIN • MOLT OR SHED THEIR OUTER SHELLS TO GROW MOLTING PROCESS OLD SHELL NEW CRAB Lobster Molting video 2:30 CLASS MERISTOMATA HORSESHOE CRABS • OLDER THAN DINOSAURS (300 MILLION YEARS ON EARTH) • EAT CLAMS, WORMS, & ARE SCAVANGERS • USE TELSON (TAIL) TO TURN OVER WHEN UPSIDE DOWN BASIC ANATOMY OF HORSESHOE CRABS SIMPLE EYES (1 LENS) COMPOUND EYE (MANY LENSES) CEPHALOTHORAX “HEAD - CHEST” ABDOMEN WITH TELSON (TAIL) BASIC ANATOMY OF HORSESHOE CRABS MOUTH FEMALE MALE 1st CLAW SHOWS SEX 6 PAIRS OF LEGS BOOK GILLS ABSORB O2 HORSESHOE CRAB MATING COPEPODS • SMALLEST CRUSTACEANS ALMOST MICROSCOPIC • MAJOR PART OF ZOOPLANKTON • EYE SPOT IS LIGHT SENSITIVE EYESPOT COPEPOD COPEPOD ISOPODS • RELATED TO LAND “PILL BUGS” • MOST ARE FREE-LIVING SCAVENGERS • SOME ARE PARASITIC FEEDING ON BLOOD ISOPOD ISOPOD ISOPOD ISOPOD AMPHIPODS • ALSO CALLED SAND OR BEACH FLEAS • EAT DETRITUS (DECAYING MATTER) ON THE BEACH • BURROW IN SAND AND UNDER DEBRIS BEACH FLEA BEACH FLEA CALIFORNIAN BEACH FLEA BARNACLES • FILTER FEEDERS ACORN BARNACLES • USE CIRRIPEDS (LEGS) TO CATCH PLANKTON • SHELLS MADE OF CALCIUM CARBONATE GOOSENECK BARNACLES • PERMANENTLY ATTACHED TO A HARD SURFACE BARNACLE FEEDING ACORN BARNACLES GOOSENECK BARNACLES INSIDE A BARNACLE CIRRIPEDS – CATCH FOOD MOUTH OVARY & EGGS PENIS & TESTES •HERMAPHRODITES HAVE BOTH MALE & FEMALE SEX ORGANS BARNACLE SEX FIDDLER CRABS • LIVE IN BURROWS ON THE SALT MARSH • FEED AT LOW TIDE - SCAVENGERS • MALE HAS LARGE CLAW 1. ATTRACT A FEMALE 2. DEFEND ITSELF AND ITS TERRITORY MALE FEMALE MALE FEMALE HERMIT CRABS •HAVE NO EXOSKELETON ON ABDOMEN •USE OLD SNAIL SHELLS TO PROTECT THE SOFT ABDOMEN •CHANGE SHELL AS SOFT ABDOMEN GROWS •MODIFIED LEGS HOLD THEM INSIDE SHELL SNAIL SHELL ABDOMEN HERMIT CRAB FLAT CLAWED HERMIT CRAB LAND HERMIT CRAB HERMIT CRAB WITH HYDRA HERMIT CRAB COCONUT CRAB MOLE CRABS • FILTER FEEDERS ON SANDY BEACHES • LIVE IN THE INTERTIDAL ZONE • USE ANTENNAE TO CATCH FOOD (PLANKTON) • BURROW USING PADDLE-LIKE LEGS MOLE CRAB MOLE CRAB MOLE CRAB MOLE CRAB WITH EGGS COMPARISON OF BODY FORMS SHRIMP HEAD THORAX ABDOMEN CLEANER SHRIMP CLEANER SHRIMP w/grouper ANEMONE SHRIMP DOCK SHRIMP SAND SHRIMP KRILL RED LINED SHRIMP BANDED CORAL SHRIMP SKELETON SHRIMP GLASS SHRIMP w/eggs EGGS BANDED CORAL SHRIMP w/eggs EGGS COMPARISON OF BODY FORMS LOBSTERS HEAD THORAX ABDOMEN NORTHERN LOBSTER SPINY LOBSTER ROCK LOBSTER NORTHERN LOBSTERS COMPARISON OF BODY FORMS CRABS HEAD THORAX ABDOMEN under body COMPARISON OF BODY FORMS CRAB HEAD THORAX ABDOMEN MALE - SKINNY FEMALE – WIDE/ROUND CRAB w/ EGGS CRAB w/ EGGS PURPLE SHORE CRAB GHOST CRAB LADY CRAB BLUE CLAW CRAB ROCK CRAB (Jonah crab) DUNGENESS CRAB GREEN CRAB ARROW CRAB DECAPODS “10 - LEGS” CEPHALOTHORAX : HEAD & THORAX ARE FUSED & COVERED BY THE CARAPACE (SHELL) HEAD THORAX CARAPACE ABDOMEN DECAPODS HEAD: ROSTRUM – POINTED END PROTECTS EYES EYES – COMPOUND LENS ON STALKS MOUTH – 6 LAYERS ANTENNAE – FOR TOUCH, TASTE, SMELL ROSTRUM ANTENNAE MOUTH EYE DECAPODS THORAX: CHELIPED WALKING LEGS WALKING LEGS - 5 PAIRS FOR LOCOMOTION 1st CLAW IS CALLED A CHELIPED DECAPODS ABDOMEN: TAIL FAN SWIMMERETS SWIMMERETS - USED IN SWIMMING - HOLD EGGS IN FEMALES - TRANSFER SPERM IN MALES TAIL FAN – SPREAD OUT FOR REVERSE LOCOMOTION CRAYFISH EXTERNAL ANATOMY MAXILLAE CUT FOOD MANDIBLE GRIND FOOD EXCRETORY PORE RELEASE URINE MOUTH MAXILLIPEDS HOLD FOOD CRAYFISH INTERNAL ANATOMY HEART PUMPS BLOOD STOMACH CRUSHES FOOD DORSAL BLOOD VESSEL CARRIES BLOOD GONAD PRODUCES SPERM/EGGS INTESTINE ABSORBS NUTRIENTS CRAYFISH INTERNAL ANATOMY BRAIN CONTROLS BODY GREEN GLAND ANUS EXCRETES URINE GILLS MOUTH ESOPHAGUS ABSORB OXYGEN EXCRETES DIGESTIVE SOLID GLAND WASTES PRODUCES VENTRAL ENZYMES NERVE CORD CARRIES IMPULSES TO/FROM BRAIN THAT’S ALL FOLKS! Eugene H. Krabs
