Nematoda Roundworms First phylum to have the Complete

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Nematoda: Roundworms First phylum to have the Complete digestive tract: mouth and anus w

Nematoda: Roundworms First phylum to have the Complete digestive tract: mouth and anus w Pseudocoelomate: fluid filled between endoderm and mesoderm w Hydrostatic skeleton under pressure which means only one shape is possible (tapered hotdog) w

Phylum Nematoda Reproduction is usually sexual—females are generally larger than males. w Fertilization is

Phylum Nematoda Reproduction is usually sexual—females are generally larger than males. w Fertilization is internal, and a female can deposit 100, 000 or more fertilized eggs per day. w The zygotes of most species are resistant cells capable of living in harsh conditions. w Hookworm

Roundworms Pinworm Ascaris: intestinal roundworm 1, 000 cases in USA: 1. 2 billion worldwide

Roundworms Pinworm Ascaris: intestinal roundworm 1, 000 cases in USA: 1. 2 billion worldwide Heartworm

Ascaris life cycle

Ascaris life cycle

Removal of Guinea Worm http: //www. youtube. com/watch? v=m. Uz 9 gq. Lmy. Q

Removal of Guinea Worm http: //www. youtube. com/watch? v=m. Uz 9 gq. Lmy. Q 0

nematodes http: //www. youtube. com/watch? v=JBLem M 3 tz. RM soil nematodes w http:

nematodes http: //www. youtube. com/watch? v=JBLem M 3 tz. RM soil nematodes w http: //www. youtube. com/watch? v=gm. FHn QKb. SM 8 lymphatic filariasis (elephantiasis) 1 billion worldwide w

Annelida: segmented worms w w w Polychaetes, earthworms, leeches Eucoelomate Segmented body plan Closed

Annelida: segmented worms w w w Polychaetes, earthworms, leeches Eucoelomate Segmented body plan Closed circulatory system Protostome: opening in gastrula becomes the mouth

Annelida: key structures Bristles on side w Aortic arches w

Annelida: key structures Bristles on side w Aortic arches w

leeches Fused segments to allow for blood storage w Blood thinner released to help

leeches Fused segments to allow for blood storage w Blood thinner released to help sucking w

http: //www. youtube. com/watch? v= DZig 6 EL 5 B 6 A&feature=Play. List &p=F

http: //www. youtube. com/watch? v= DZig 6 EL 5 B 6 A&feature=Play. List &p=F 648 EFCC 1 BE 6 AAA 3&playn ext=1&index=10 Earthworms in Australia Earthworms are hermaphroditic. They fertilize each other with the clitellum secreting a mucus sack to collect the eggs and sperm. This sack is then placed into the ground until babies are developed.

annelids Polychaete: clamworm w http: //www. youtube. com/watch? v=Ld. Hz. R Ndz 2 HU

annelids Polychaete: clamworm w http: //www. youtube. com/watch? v=Ld. Hz. R Ndz 2 HU w