SEGMENTED WORMS. PHYLUM ANNELIDA. Don’t try this at home! . many bristles. CHARACTERISTICS :. SEGMENTED BODY. BILATERAL SYMMETRY. MANY WELL DEVELOPED SYSTEMS. RAPTORIAL FEEDERS: ex: CLAMWORM & BLOODWORM. Blood worms have 4 jaws.
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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.
TENTACLES sense of touch, taste/smell
SEPTA walls separate segments
PHARYNX pushed out to feed
PARAPODIA act as gills (absorb oxygen) & used to crawl & dig
DORSAL BLOOD VESSEL CLOSED SYSTEM!
SETA / CHAETES
VENTRAL NERVE CORD
VENTRAL BLOOD VESSEL
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