ARTHROPODS JOINTED-LEGS ARTHROPODS ARE THE LARGEST GROUP OF ANIMALS!

WHO S WHO? SHRIMP ISOPOD SPIDER CRAB 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 COMPOUND EYE (MANY LENSES) SIMPLE EYES (1 LENS) CEPHALOTHORAX HEAD - CHEST ABDOMEN WITH TELSON (TAIL)

BASIC ANATOMY OF HORSESHOE CRABS MOUTH FEMALE MALE 1 st CLAW SHOWS SEX 6 PAIRS OF LEGS BOOK GILLS ABSORB O 2

HORSESHOE CRAB MATING

COPEPODS SMALLEST CRUSTACEANS ALMOST MICROSCOPIC EYESPOT MAJOR PART OF ZOOPLANKTON EYE SPOT IS LIGHT SENSITIVE

COPEPOD

ISOPODS RELATED TO LAND PILL BUGS MOST ARE FREE-LIVING SCAVENGERS SOME ARE PARASITIC FEEDING ON BLOOD

ISOPOD

AMPHIPODS ALSO CALLED SAND OR BEACH FLEAS EAT DETRITUS (DECAYING MATTER) ON THE BEACH BURROW IN SAND AND UNDER DEBRIS

BEACH FLEA

CALIFORNIAN BEACH FLEA

BARNACLES ACORN BARNACLES FILTER FEEDERS 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 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

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 ABDOMEN CARAPACE

DECAPODS HEAD: ROSTRUM POINTED END PROTECTS EYES EYES COMPOUND LENS ON STALKS MOUTH 6 LAYERS ANTENNAE FOR TOUCH, TASTE, SMELL EYE ROSTRUM ANTENNAE MOUTH

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 GONAD PRODUCES SPERM/EGGS DORSAL BLOOD VESSEL CARRIES BLOOD INTESTINE ABSORBS NUTRIENTS

CRAYFISH INTERNAL ANATOMY BRAIN CONTROLS BODY GREEN GLAND EXCRETES URINE MOUTH ESOPHAGUS GILLS ABSORB OXYGEN DIGESTIVE GLAND PRODUCES ENZYMES ANUS EXCRETES SOLID WASTES VENTRAL NERVE CORD CARRIES IMPULSES TO/FROM BRAIN

THAT S ALL FOLKS! Eugene H. Krabs