Platyhelminthes
Position in the Animal Kingdom
Type of symmetry - bilateral
Number of internal spaces - none
Type of body cavity - acelomate
Number of germ layers - three
Phylum Characteristics
Body form-flattened
Type of nervous system-two nerve cords
Type of excretory system-one opening. water collecting tubules. flame cells
Type of reproductive system-asexual
Type of digestive system-one opening with muscular tube
Type of motion-cilia and host's circulation
Generic life cycle of parasitic species-larva then host one then attaches to host two
Ecological Relationships
Modes of living-active
Hosts for Parasites-Humans, animals, molluscs
Economic Impact-Hardly any
Class Tubellaria
Modes of life-epidermal cilia
Type of Life cycle-involves more than one host
Locomotion-ciliary gliding and muscular contractions
Digestive System-no digestive cavity. branched gut.
Excretion and osmoregulation-flame cells
Sense organs-none
Reproduction-asexual
Class Trematoda
Mode of life-oral suckers and hooks
Hosts are…gastropod mollusc and a vertebrate
Special structures…has hooks and suckers
Major adaptations for parasitism-suckers to attach
Life cycle is…complex and has 2 hosts
What body systems are infected-liver and intestines
i. Geographic location-Asia and Eastern Europe
ii. Infect what organisms-human liver
iii. Typical life cycle-pass through several immediate hosts before being ingested in a human
iv. Economic effect (positive and negative)
Human blood fluke-
i. Geographic location-warm regions and fresh waters
ii. Infect what organisms-humans
iii. Typical life cycle-main host and secondary host
iv. Economic effect (positive and negative)-gets rid of waste
i. Geographic location-wetter regions
ii. Infect what organisms-sheep and cattle
iii. Typical life cycle- eggs laid in liver and try to find intermediate host snails.
iv. Economic effect (positive and negative)
Class Cestoda
Common name is…tapeworms
Mode of life-no locomotor organs
Hosts are…usually has 2 hosts
Special structures…has attachment hooks
Life cycle is…primary host and 1 or more secondary host
What body systems are infected-intestines
Beef tapeworm
i. Geographic location-Africa, Eastern Europe, Latin America
ii. Infect what organisms-cattle and humans
iii. Typical life cycle-cattle is intermediate host and human is definitive host
iv. Economic effect (positive and negative)
Dog tapeworm
i. Geographic location-everywhere
ii. Infect what organisms- intestines of meat eating organisms
iii. Typical life cycle- two hosts
iv. Economic effect (positive and negative)