Turbellaria

Tubellaria Headed Worms or also called Vibrate is a member of a class of invertebrates are included in the phylum Platyhelminthes. One example is Tubellaria : Planarians sp. This worm is carnivore and can be found in the water, puddles, ponds, or rivers. Usually this worm attaches dibatuan or in leaves of flooded. Some Turbellaria choppy movement to swim in the water.

Planarians
If we want to take a planaria, how to give a piece of fresh meat into the water we thought there was a worm. Then the planaria will stick to the meat. Body length of about 5-25 mm, moves with cilia found on his body epidermis. This bending movement along the worm slime diekskresikannya.

Organ systems in

Alimentary tract
Digestive tract consists of mouth, pharynx, and intestine. These animals have no anus. Digestive tract begins with the mouth located on the ventral, approximately in the middle of the body. Pharynx can be extended and connected to the anus (gastrovaskuler cavity). Some planaria have a three-pronged intestine: one branch to the anterior and posterior to the two branches. Each branch of the intestine is branched again to the whole body. The third branch of the intestine is rejoined in the pharynx. Food goes through the mouth, and the digestion was circulated throughout the body through the branches of the intestine, whereas the undigested food residue removed through the mouth.

Excretion system
These animals excrete the remains of metabolism of nitrogen through the surface of the body. Osmoregulation of protonefridia system consisting of flame cells scattered at the edge of the body. These cells fire a hollow pipe that comes a beam of cilia. If the cilia vibrate, the fluid pushed into the channel associated with the pores of the body surface.

Nervous System
The nervous system consists of ganglia located in the head. Of each nerve ganglia have a beam that extends toward the posterior on the edge / lateral body. Each nerve bundles branch out horizontally connecting the two lateral nerve bundles to form a rope ladder nervous system. Ganglia may be regarded as the brains of these animals. Lateral nerves ramify outwards from the nerve cord to the muscles of the body. The branches of this nerve as a peripheral nerve. Both of these nerve cords meet in the front end and back end. At the anterior end of the body is a tool that is sensitive to light stimuli, ie, a pair of eye spots.

Reproductive system
Reproduction occurs both sexually and asexually. Repproduksi depending on day length and temperature. Sexual reproduction occurs during the short and cold. Asexual reproduction occurs during the long and warm air. Sexual reproduction occurs through cross-breeding. On cross-breeding, two planaria attach themselves to the ventral part of the hole so that the genitals (genital porous) face and intersect, then there is internal fertilization. This can happen when sex cells are ripe. Planarians are hermaphrodites. However, sperm can not fertilize an egg of his own body, because the sperm and egg cooking is different. Asexual reproduction by regeneration, which is preceded by an increased body length and body parts near the pharynx gradually narrowed and finally disconnected. Severed part will equip themselves. Each will be a new and complete body. Ability to complete the missing body parts or damaged is called regeneration. Planarian regeneration are known to have high power.