1. Phylum Nematoda
Roundworms

6. monsters inside me roundworms

7. Taxonomy Kingdom Animalia Phylum Nematoda
Class Secernentea Class Adenophorea
Filarial worms Trichinella worm
Roundworms
Hookworms
Pinworms

8. General Characteristics
Live in fresh and salt water, soil and inside organisms
Live in every habitable environment
Over 8,000 named species
Parasites to many plants and almost every type of animal
Pseudocoelomate: false body cavity
Straight-through digestive tract with 2 openings

9. Form and Function Body Plan: Pseudocoelom
Three layers: Epidermal (cuticle) layer, muscle layer and gut cavity
The pseudocoel is fluid-filled and holds reproductive organs

10. Form and Function Epidermis: thick cuticle layer for protection
Hydrostatic skeleton: a fluid-filled, pressurized cavity surrounded by muscle

11. Digestion
Digestive System: Consists of a mouth, pharynx (throat), an intestine, a rectum and an anus
One way straight path

12. Circulation and Respiration
Circulation: No circulatory system: Cells circulate nutrients and gases
Respiration: Gas exchange occurs through diffusion through cuticle
Sensory organs: 2 nerve cords (ventral and dorsal)

13. Movement
Movement: move by muscle contractions and cilia (tiny hairs)

14. Reproduction Most are dioecious Fertilization is internal
Males have a spicule to grab on to the female while mating
Shelled fertilized eggs are stored in the uterus until they can be deposited in the soil
One female can lay up to 200,000 eggs in one day

16. Life Cycle Stages
4 juvenile stages with molting occurring between stages
Some stages require an intermediate host

18. Class Secernentea: Roundworms
Most common worm parasite in humans
Live in Tropical areas with poor sanitation
Eggs can survive for years in soil (unhatched)
Contracted by eating vegetables from infected soil
Lives in the intestines of the host but can migrate to the heart, lungs or brain
roundworm parasite in toddler

21. Class Secernentea: Hookworms
Transmitted through the soil
Either ingested or can burrow through the skin
Attach to the intestinal wall and suck more blood than they need
Can lead to high amounts of blood loss
parasite from cat scratch

26. Pinworms The most common parasite in the U.S.
Contracted through ingestion or anally
Adults live in large intestine
Live in intestines but migrate to the anus at night to lay their eggs

29. Filarial Worms Most common is the heartworm in dogs
Enters tissues and causes immense swelling (elephantitis)
Transmitted into blood stream through mosquitoes

32. Class Adenophorea: Trichinella Worm
Cause the potentially lethal disease trichinosis
They are found in almost any body tissue
Transmitted by eating uncooked pork or other infested meat
Infect a wide range of mammals
trichinosis
monsters inside me