PHYLUM

ANNELIDA

SEGMENTED WORMS

Don’t try this at home!

many bristles

• SEGMENTED BODY

• MANY WELL DEVELOPED SYSTEMS

• BILATERAL SYMMETRY

CHARACTERISTICS:

RAPTORIAL FEEDERS:

ex: CLAMWORM & BLOODWORM

Jaws protrude out

of the body!

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.

Bloodworms

have 4 jaws!

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

2 JAWS

grasp prey

50 sec

PARAPODIA

CLAMWORM

BLOODWORM

BOBBIT

WORM

2 min

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

SPIRAL

TUBE

WORMS

FEATHER

DUSTER

WORMS

CHRISTMAS

TREE

WORMS

WORM

TUBES of

calcium

DEPOSIT FEEDERS

• USE STICKY TENTACLES

TO FIND FOOD ON THE

SURFACE OF SEDIMENT

• LIVE IN BURROWS

IN SAND/MUD

GILLS

25 sec

SPAGHETTI WORM

SPAGHETTI WORM

CROSS-SECTION

MUSCLES

DORSAL BLOOD VESSEL

CLOSED SYSTEM!

REPRODUCTIVE

CELLS INTESTINE

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/DIGGING

NERVE CORD – CARRIES MESSAGES

TO/FROM THE BRAIN

NEPHRIDIA– EXCRETE URINE

SETA/SPINES – HELP MOVE

INCREASE TRACTION