Phylum Annelida (segmented worms)

segmented worms, true coelom Includes: earthworm marine worms leeches Characteristics segmented worms, true coelom Includes:  earthworm marine worms leeches

Annelids -Annelida means “little rings” -body segments separated by septum Septum = internal wall - some have bristles called setae -have closed circulatory system -have well-developed nervous system (brain) -sexual reproduction, some are hermaphrodites *See Earthworm Anatomy

Class Oligochaeta Class Oligochaeta – Earthworm -Streamlined bodies (p. 697 fig. 27-16) -Few setae -Live in soil or fresh water -Castings - enrich soil, (worm poop)

Class Hirudinea Leeches -external parasites with suckers on each end -medicinal uses (circulation, anti-clotting) 

Leeches being bred for medical uses.

Class Polychaeta -includes: sandworms, bloodworms, & relatives Marine worms See p.698 fig.27-18 -includes: sandworms, bloodworms, & relatives -have paired paddlelike appendages with setae

Nereis

Featherduster

Fireworm