|
|
|
REINO________________Animal PHYLUM_______________Molusco (Mollusca) CLASE________________Gastrópodo (Gastropoda) NAME CIENTIFICO (I generate and especie)____________Helix aspersa The snails are moluscos pertaining to the class of the gasterópodos and the family of the helícidos ones; they have very visible an external shell dorsal, of forms and varied colors. They have the shell coiled in spiral, developed well and able to lodge all the body of the animal. Its body is soft and sticky and have tentacles or telescoping antennas. In the head are the antennas and in their extremities are the eyes that are sensible to the light and the tact. There are no true otocistos ears but, that are equally useful auditory organs for the balance of the animal. In the mouth of the snail, is a called structure rádula that it is formed by a series of teeth that slide on a called structure odontóforo. The function of its teeth is to scrape the food as if outside one files, later to be introduced to the alimentary canal and to take place the digestion and assimilation. If we give to eat to the snails in without noise and used a microphone it will be able to listen to clearly the noise similar to the one to rub one files.
|
|
|
These animals as others have a salivary gland located in the superior part of the mouth, which them aid in the digestion process. They secrete a viscous dribble, the limacina, that serves like lubrication and glue to raise by inclined zones; also it has a protective function so that they are always humid. They move by means of a muscular structure called foot, that allows to slide them by diverse surfaces: rough, vertical or smooth. The opening by which the foot is shown, receives the name of estoma, the edge that surrounds to the same one is called peristoma to him and underneath this one we found neurostoma. The part of inside of the shell very is developed, having reproductive, digestive, excretor and circulatory apparatus. The visceral mass of the snail is within the shell surrounded by a call mantle that is in charge to produce a calcárea secretion that, in contact with the air, becomes hardened quickly and it allows to repair damages him and to grow. Its growth is pronounced in form of lines in the shell. One clings to the shell thanks to the muscle to columelar and the direction of rotation is of left to right. The heart is very rudimentary, so single account with a ventricle and an auricle. The weight of the Helix aspersa is of about a 8-10 gr.. And its life expectancy is of 5 to 6 years.
|
|
|
