phylum annelida segmented worms. don’t try this at home!

PHYLUM ANNELIDASEGMENTED WORMS

Don’t try this at home!

many bristles

• SEGMENTED BODY

• MANY WELL DEVELOPED SYSTEMS

• BILATERAL SYMMETRY

CHARACTERISTICS:

RAPTORIAL FEEDERS: ex: CLAMWORM & BLOODWORM

Blood worms have 4 jaws

RAPTORIAL FEEDERS: HAVE HOOK-LIKE JAWS HELD INSIDE THE BODY WHICH STRIKE OUT TO GRAB PREY. FOOD IS THEN PULLED BACK INSIDE OF THE BODY & DIGESTED.

CLAM WORM - RAPTORIAL FEEDER

SEPTA walls separate segments

PARAPODIA act as gills (absorb oxygen) & used to crawl & dig

TENTACLES sense of touch, taste/smell

PHARYNX pushed out to feed

JAWS grasp prey

PARAPODIA

CLAMWORM

BLOODWORM

BRISTLE WORM

FIRE WORM – immature

FIRE WORM – mature

SUSPENSION FEEDERS• FILTER FEEDERS

• FOOD IS TRAPPED BY FEATHERY TENTACLES & BROUGHT TO THE MOUTH

• LIVE IN TUBES THEY CREATE (SAND, CALCIUM)

• EXAMPLES: FAN WORM FEATHER DUSTER WORM

SUSPENSION FEEDERS

TENTACLES

MOUTH

TUBE

FEATHER DUSTER WORM

FEATHER DUSTER WORM TUBE

BEFORE

AFTER

Yellow Feather Duster Worm

BANDED FEATHER DUSTERS

RED TUBE WORMS

FEATHER DUSTER

SLIME FEATHER DUSTER

CHRISTMAS TREE

WORMS

SPIRAL TUBE WORMS

CALCIUM WORM TUBES

SPIRAL WORM SHELL

DEPOSIT FEEDERS• USE STICKY TENTACLES

TO FIND FOOD ON THE SURFACE OF SEDIMENT

• LIVE IN BURROWS IN SAND/MUD

GILLS

SPAGHETTI WORM

SPAGHETTI WORM

CROSS-SECTION

MUSCLES

DORSAL BLOOD VESSEL CLOSED SYSTEM!

REPRODUCTIVE CELLSINTESTINE

VENTRAL NERVE CORD NEPHRIDIA

SETA / CHAETES

VENTRAL BLOOD VESSEL

PARAPODIA

SPINES

FUNCTIONS OF ORGANS/SYSTEMS

INTESTINE – ABSORB NUTRIENTS

MUSCLES – CAUSE MOVEMENT BLOOD VESSELS – CARRY BLOOD

PARAPODIA – CRAWLING/DIGGINGNERVE CORD – CARRIES MESSAGES

TO/FROM THE BRAIN

NEPHRIDIA– EXCRETE URINESETA/SPINES – HELP MOVE

INCREASE TRACTION