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.
- 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
- Mesoderma ( the middle layer ) in further development, mesoderma will
establish an instrument of reproduction, muscle tissue, and connective
tissue.
- Endoderma (inner layer) in a further development, the endoderma will
form the gastrodermis/gastrovaskuler as the digestive tract food.
organ system
- respiration. Flatworm doesn't have a system of respiration, but emit CO2 and O2 Flatworm's body as a diffusion through the cell wall.
- 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
- 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 )
- The nervous system consists of two cerebral ganglia which are equipped with the nerves forming the nervous edge of stair
- 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,