•Complete questions on Coloring sheetfor tomorrow.

•Complete ‘Scramble Words’ Vocabularysheet for Wednesday.

•Quiz on Thursday on the vocabulary forAnnelida

The segmented worms

“annelus” - little ring I’m metameric

3 classes of AnnelidaClass Polychaeta – mostly marine fanworms, bristle worms, tube worms

Feather duster worms ( Polychaetes)Filter feeder

Class Oligochaeta - earthworms

Class Hirudinea - leeches

General characteristics• segmented body

• coelomate

•Longitudinal and circular muscles

• Setae/ bristles used for locomotion

•Soft bodies – hydrostatic skeleton

• Bilateral symmetry

Respiration:•In feather duster worms – gills•Earthworms – moist skin

Specialized structures: Ex. Earthworm•Prostomium – used for sensingand digging through the soil.

•Earthworms have a closed circulatory system:

•Blood flow in blood vessels – dorsal and ventral.• They have 5 pumping ‘hearts’ calledpseudo-hearts or aortic arches. (Color red)

Segments

Segments

Segments

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=_ydYzGNa5V0g7M&tbnid=efiYwdSToOSUTM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.studyblue.com%2Fnotes%2Fnote%2Fn%2Fbio-practical%2Fdeck%2F6391414&ei=X70HU5GtBMiA2gXLsoHwBg&bvm=bv.61725948,d.b2I&psig=AFQjCNG_Mxd3GlHlM0BFhP4WNKStjXOIog&ust=1393102325839826

•Digestive system: Mouth, Pharynx, Esophagus,•Crop (store food), gizzard (ground up food), intestine (digestion), anus (excretion) Color Green

•Nephridia for excretion•Clitellum – Secretes mucous ring forfertilization.

•Ganglia form ‘brain’. Has a ventral nerve cord. Color Blue

Nephridia – Helps with excretion of nitrogen containing wastes.

Reproduction: Example - Earthworm•Sexual reproduction•Hermaphrodites – Male and Female reproductivestructures.Eggs produced in ovaries•Worms exchange sperm:Sperm produced in testes.Seminal receptacles receive the sperm from the other worm during mating.Seminal vescicles store sperm from other worm.•External fertilization in a mucous ring which becomes a cocoon. Mucous ring forms at clitellum.

MaleFemale

Male

http://www.sciencelearn.org.nz/Science-Stories/Earthworms/Sci-Media/Video/Physical-adaptations-for-life-underground

Mode of nutrition:

Some are filter feeders – Tube wormsSome are carnivores – Nereis

Earthworms feed on decaying vegetation.

Movement:•Body muscles and a hydrostatic Skeleton.•Marine annelids have parapodiaUsed for swimming and crawling

•Earthworms have bristle likeSetae to help with movement.