Flatworms (Exam 2)

Flatworm phylum

Platyhelminminthes

Symmetry type

bilateral

Body cavity type

Acoelomate

Acoelomate means

no body cavity

Platyhelminthes belongs to which clade?

Bilateria

Free-living worms can be found in what kind of environment?

Wet

Segmented or unsegmented?

Unsegmented

The —- is more complex in free-living worms than parasites

Digestive system

Where does the digestion and absorption of food take place

Gastrovascular cavity

The —- is more productive in parasites than free-living

Reproductive system

Free-living worms has more

Cephalization

Classes in Platyhelminthes

Turbellaria, Cestoda, and Trematoda

Class Turbellaria are mostly

Free-living

Class Turbellaria habitat

Many marine, some freshwater, few terrestrial

Class Turbellaria reproduction process called

Penis fencing

Playing the female role in reproduction is more

Energy-expensive

Class Trematoda AKA

Flukes

Class Trematoda are all

Parasitic

Class Trematoda requires both a definitive —- and a intermediate —-

Host

In Class Trematoda, a definitive host is

The final host, houses adult reproductive form

In Class Trematoda, a intermediate host

Hosts juvenile form

Organ of attachment in Class Trematoda

Sucker

Disease caused by Class Trematoda (blood worms)

Schistosomiasis

Physical presentation of Schistosomiasis

Class Cestoda AKA

Tapeworms

Definitive host in Class Cestoda

Humans

Intermediate host in Class Cestoda

Cattle

Organ of attatchment in Class Cestoda

Scolex

Class Cestoda proglottid

Segments, full of reproductive systems

Class Cestoda digestion

Through diffusion