complete questions on coloring sheet for tomorrow. complete ‘scramble words’ vocabulary sheet...

•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

•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.