Phylum Platyhelminthes

Flat worms:

1. Most are endoparasites causing serious diseases to man and animals.

2. They have limited or no respiratory, locomotry and sensory organs.

3. The alimentary canal is simple.

4. Most of them are Hermaphrodite.

5. Reproduce sexually and asexually.

Subdivided into three classes

	Class Turbellaria	Class Trematodes	Class Cestoda
Examples	Planaria	Tapeworm (Taenia)	Liver Fluke (Fasciola) Bilharzia
Host		Cow, pig then man Causing digestive disturbances & anemia.	Cow and man

	Phylum Nematohelmnthes (Nematodes)	Phylum Annelida (Ring worms)
Examples	Ascaris, Anklystoma	Eart h worm, Medical leech
Feeding	Some worms are free-living	Free living
environment	In water or mud. while other live as parasites on man & animals	Sea, fresh water & moist soil Few are ectoparasites (medical leech).
Body shape	The body is cylindrical.	Segmented body
Structure	No locomotary, respiratory or sensory systems. (unisexual).	Closed circulatory system, have excretory and nervous system.
Reproduction	Female is bigger than male & lays a huge number of eggs.

Kingdom Animalia

Phylum Arthropoda

1. The most widely spread invertebrates

2. Their bodies are divided into identical segments.

3. They have jointed legs

	Class Crustacea	Class insecta	Class Myriopoda	Class Arachnida
Examples	Cray fish Prawn Crab	locust, cockroach, honey bee, ants, housefly, flea, mosquito silk worm	Millipede Centipede	Spider,Scorpion Tick,Mite
Structure of the body	Body is covered by a Chitnous cuticle.	Body is divided into head, thorax & abdomen. Some have wings others don't .		Body is divided into thorax and abdomen, they have 4 pairs of legs.
Respiration	by Gills	Trachea		Trachea and lungbooks
Eyes		Compound eyes		Simple eyes