DIBALIK PLATYHELMINTHES ....

PLATYHELMINTHES 

flatworm is a worm that her group shaped flattened (platy = flat, helminthes = worms)

General characteristics 

• Life in fresh water, the sea, humid soil or as parasites in animals or plants and humans. 
• Are hermaphrodite, generative reproduction with cross-breeding, with vegetatively splitting (fragmentation) 
• The living worm parasites have a layer of cuticle and suction tool or tool hooks that are used to attach to the host cell wall. 
• pencernaanya Tool in the form of gastrovaskuler cavity, the excretion of the cells of fire, rope ladder nervous system. 
• flat body having a Flatworm, epidermis ciliated, and software 
• Flatworms are animals tripoblastik who have no body cavity (acoelomata) 

This worm does not have any system of blood circulation and breathing with the entire surface of the body. The structure of the body. Elongated flat body dorsoventral without segementasi or toll roads. Parts of the body can be divided into the anterior (front of the head), posterior (the back of the tail), dorsal (back), ventral (area opposite the dorsal and lateral (beside body). their body have bilateral simetri's shape and arrange by 3 layers.

1. Ektoderma (the outer layer) in a further development, the ektoderma will form the epidermis and cuticle. The Epidermis soft and ciliated and serves to help the tool motion. Often the epidermis cuticle sealed and partially equipped with tools that can be used to attach themselves to a host that is chitin 
2. Mesoderma ( the middle layer  ) in further development, mesoderma will establish an instrument of reproduction, muscle tissue, and connective tissue.  
3. Endoderma (inner layer) in a further development, the endoderma will form the gastrodermis/gastrovaskuler as the digestive tract food. 

organ system

1. respiration. Flatworm doesn't have a system of respiration, but emit CO2 and O2 Flatworm's body as a diffusion through the cell wall.
2. digestive. The digestive tract in animals is not perfect, in the form of a cavity gastrovaskuler which rests in the middle of the body and playing role as the intestines. But there are also platyhelminthes who do not have the digestive tract  
3. excretion. Excretory system is simple and especially serves to maintain balance osmosis between animals with their environment. System are composed of cells ciliated, namely cell fire or cells feathers trill ( solenosit ) 
4. The nervous system consists of two cerebral ganglia which are equipped with the nerves forming the nervous edge of stair 
5. In General, these are animals hermaphrodite. It means on one body there are males and females genitals, however rarer conception itself, the reproduction happens by vegetative and generative. Generative: with cross-breeding of internal fertilisation takes place and Vegetative regeneration way: (fragmentation), i.e. new individuals coming from the body of its mother.

clasification:

Turbellaria, Trematoda,