Annelids By Lizzy Wygonik and Kiera Flanigan Symmetry

Annelids By Lizzy Wygonik and Kiera Flanigan

Symmetry Bilateral: two symmetrical halves Modern Biology. Holt, Rinehart and Winston, 2002.

Locomotion ● Contract & expand ● Circular/longitudinal muscles ● Setae ● Parapodia Modern Biology. Holt, Rinehart and Winston, 2002.

Nervous System ● Ganglion in body segments ● Connected by ventral nerve cord ● Carry impulses to brain “Nervous System of Earthworm. ” Microbiology Notes, 15 Feb. 2016, www. microbiologynotes. com/nervoussystem-of-earthworm/. Modern Biology. Holt, Rinehart and Winston, 2002.

Digestive System ● One-way ● Sucks soil into mouth by pharynx ● Gizzard grinds soil ● Typhlosole increases surface area ○ Digestion and absorption Modern Biology. Holt, Rinehart and Winston, 2002. ● Crop stores food

Excretory System ● Present ● Nephridia ○ Tubes used to eliminate cellular waste ● Present in all but first three and last segment ● Some water is reabsorbed by blood vessels Modern Biology. Holt, Rinehart and Winston, 2002.

Circulatory System ● Closed System ● Transports oxygen and carbon dioxide ● Blood travels through ventral BV ○ Toward posterior end Modern Biology. Holt, Rinehart and Winston, 2002.

Respiratory System ● Diffusion/osmosis ● Oxygen and carbon dioxide diffuse directly ● Cutaneous “Biology. ” Chemistry, Byjus Classes, byjus. com/biology/respiration-cockroachearthworm/. Modern Biology. Holt, Rinehart and Winston, 2002.

Support System ● Skeletal system is absent ● Segmented Modern Biology. Holt, Rinehart and Winston, 2002.

Reproductive System ● Sexual ● Hermaphrodites ● Cannot fertilize its own egg ● Worms are held together by setae ○ By film of mucus secreted by clitellum ● Limited regeneration Modern Biology. Holt, Rinehart and Winston, 2002.

3 Main Classes of Annelids

Oligochaeta ● Earthworms ● Fewer setae ● No parapodia ● Aerate soil ● Higher productivity Modern Biology. Holt, Rinehart and Winston, 2002.

Earthworm Video ---. "Shape of Life: Annelids Lumbricus - Earthworm. " You. Tube, 13 May 2014, youtu. be/Lhfc. S 7 pbk. Kg.

Earthworm Diagram The Earthworm Resource, earthwormresources. weebly. com/reproductio n-and-development. html.

Polychaeta ● Sand, tube, clam, bristle worms ● Many parapodia & setae ● Most are marine Modern Biology. Holt, Rinehart and Winston, 2002.

Bristleworm Video ---. "Shape of Life: Annelids Diopatra - Tube Dwelling Worm. " You. Tube, 19 May 2014, youtu. be/i. Jwnw. OCYxq. M. Accessed 4 Oct. 2018.

Hirudinea ● Leeches ● Fixed number of segments ● Suckers ● Medicinal purposes Modern Biology. Holt, Rinehart and Winston, 2002.

Leech Video STruong 17. "Shape of Life: Annelids Leeches. " You. Tube, 13 May 2014, youtu. be/4 QJt 2 BYkdiw.

Phylum Facts ● Hermaphrodites ○ Both male and female ● Largest earthworm can grow up to 10 ft ● Live in ground or water ● divided into more than 100 segments Modern Biology. Holt, Rinehart and Winston, 2002.