1. Trematoda

2. Class Trematoda
Flukes that live as parasites either on or in other organisms.
Outer body lacks cilia; tegument has a layer of glycoproteins that are important in protection and absorption
Possess 2 suckers:
1. Oral sucker which attaches to organs of the host
2. Ventral sucker or acetabulum; used to attach to host tissues

4. Types of Hosts
Often have complex life cycles that alternate between sexual and asexual stages.
Most require at least 2 different kinds of hosts to complete their life cycle:
1. Definitive host (primary host)
The host in which the parasite matures and reproduces (sexually)
The host in which eggs are released
2. Intermediate host
Hosts in which larval stages develop and undergo asexual reproduction
Results in an increase in the number of the individuals

5. General Life Cycle - Chinese liver fluke, Clonorchis sinensis
Adults live in the bile ducts of humans, dogs, and cats
There are 2 intermediate hosts: a snail and a fish
Eggs are passed out of the definitive host and hatch as ciliated larvae called miracidia
The miracidia penetrates a snail molluscan host and becomes a sporocyst

6. They undergo asexual reproduction producing larvae called rediae
Rediae often asexually produce more rediae, but will eventually give rise to larvae called cercariae
They leave the molluscan host and penetrate fish
They encyst in the fish tissues as the metacercaria
Consumption of infected fish results in the metacercaria excysting in the gut and migrating to the bile duct

8. Schistosoma
Schistosoma spp. is a common blood fluke of Southeast Asia that causes shistosomiasis
Humans are the definitive host; snails are the intermediate host
In humans its eggs ultimately penetrates and damages intestinal tissue and tissue of the bladder
A source of constant inflammation and eventually leads to deterioration of liver, spleen and other organs

10. Fasciola Dikenal sebagai cacing hati.
Contohnya Fasciola Hepatica dan Fasciola Nigantica
Bentuk tubuh agak oval dengan panjang mencapai 3-5 cm.
Bagian mulut meruncing yang terdapat kait dan pengisap.
Di belakang tubuhnya ada alat pengisap kedua yang disebut pengisap ventral.