Presentation on theme: "PHYLUM Common Name NEMATODA Round Worms ? ? Biology: pg 406-407BDOL: pg 731-733."— Presentation transcript:
PHYLUM Common Name NEMATODA Round Worms ? ? Biology: pg BDOL: pg
Nematoda # of Species?80,000+ Life Style?50% parasitic Where Are They Found? 90,000 in 1 apple 50 species infect humans alone. 10 million / meter 2 (ubiquitous)
Nematoda Features? One way tube No circular muscles The first “anus” Eyespots (free-living) Dioecious (means?) - Separate male & females
Nematoda Body Cavities? (none) - Name? - Example Organism? Acoelomate Planarian Endoderm Ectoderm Mesoderm
Nematoda Body Cavities? - Name? - Example Organism? Ascaris Pseudocoelom
Nematoda Body Cavities? - Name? - Example Organism? Coelom Earthworm or Human
Nematoda Pet Infections - Ascarids - Hookworms
Nematoda Ascarids Cats - Toxocara cati
Nematoda Ascarids Dogs - Toxocara canis
Nematoda Ascarids Raccoon - Baylisascaris procyonis - 70 to 90% infection rate - Eggs have long-term viability - Low infectious dose needed - Larval Migrans in humans Primarily dangerous to human children
Nematoda Ascarids Larval Migrans? Toxocariasis (TOX-o-kah-RYE-us-sis) Human ascarid infection from pets. 10,000 cases / year - Larva in wrong host - tries to complete its life cycle anyway - Larva starts to migrate – gets lost – often in the eye or brain - Larva dies - causing extreme inflammatory reaction
Nematoda Ascarids Larval Migrans - External Links: Cutaneous, visceral & ocular larva migrans (ex: Whipworm) Cutaneous, visceral & ocular larva migrans (ex: Whipworm) Baylisascaris procyonis (roundworm from raccoons) Dirofilaria immitis (heartworm from dogs) Strongyloides stercoralis (threadworm from dogs) - Most victims are children – consuming worm eggs in soil
Nematoda Ascaris lumbricoides - What protects it? - Number infested? Ascarids Scientific name of our dissection specimen? Cuticle 1 billion
Nematoda Ascaris lumbricoides Life Cycle? Egg
Nematoda Ascaris lumbricoides - Bolus (fatal)
Nematoda Worm ID? Hookworms Note Pharynx
Nematoda Ancylostoma duodenale Hookworms Life Cycle? - Larva in warm soil enter feet - Skin “trails” & “ground itch” - To blood, to lungs, then swallowed - Larvae attach to intestine & mature - Eggs leave with feces - hatch in soil - Adults mate & release eggs Scientific name?
Nematoda Ancylostoma duodenale - 10 – 15 mm - Hook-shaped Hookworms - Cutting plates - Anticoagulant - Anemia if 25 – 50 worms - 1,500+ infestations - May live several years Stray Facts & Vocab Terms
Abdominal pain, Allergies, Anemia Chronic fatigue, Constipation, Diarrhea Eating without feeling full Gas and bloating, Headaches Irritable bowel syndrome Itching (anus or other places) Joint and muscle aches and pains Lethargy, Loss of appetite Nervousness, Skin conditions Sleep disturbances Teeth grinding How do I tell if I have a parasite?
How can a parasite hurt me? Destroy cells faster than cells can be regenerated. Produce toxic substances and allergic reactions. Irritate and invade body tissue, including the skin and intestinal lining. Put pressure on body organs and cause organ obstructions. Depress immune system function while activating immune system response. Result in malabsorption of nutrients.