By Sudha Vashisht P.G.G.C.G. -11 CHD
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1 By Sudha Vashisht P.G.G.C.G. -11 CHD
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3 Pila is the common Apple snail which is found in ponds ditches, rivers and in watery fileds. The soft body is covered by a coiled shell. The first chamber of the shell is apex, the last one is body whorl with a depression called varix and an opening the columella. The shell has a large opening which is covered by operculym.. Below the shell is the thin transparent covering called mantle which covers the visceral mass. The soft body of Pila can be divide into head, foot and visceral mass. Head has a pair of eyes, tentacles and labial palps. Foot is a highly muscular creeping organ. Respiration by ctenidium (Gills) in water and by pulmonary sac on land Nervous system and sense organs are well developed. Sexes are separate.
4 Shell The soft body of pila is covered by a Calcareous shell. It is spirally coiled. The coils of the shell are called whorls. The upper whorl is called apex. The apex is the first formed whorl. The lower most whorls are larger called body whorl... The shell opens out by a large opening called shell mouth. The margin of the mouth is called peristome or lips. It is formed of inner lip and outer lip. If the shell is held with the apex away from the observer, the mouth is towards right. The shell of pila is dextral. The shell mouth is closed by a lid called operculum.the collumella, the central axis of the shell, is hollow and twisted. It opens to the exterior by a small opening called umbilicus.
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6 Body: The body of pila is soft. It is divisible into 3 parts- anterior head, ventral foot and dorsal visceral mass. The head and fott are protruded from the shell for creeping but the visceral mass always remains within the shell. Head: The head bears two pairs of tentacles: anterior cephalic tentacles,posterior true tentacles and eyes. Foot: The foot is ventral and highly muscular. It has a flat smooth ventral surface called sole. Visceral mass: The visceral mass is the largest part of the body. It is coiled spirally like the shell. Mantle of Pallium: Between the free margin of the mantle and the body there is a wide space known as mantle cavity. The mantle cavity contains a number of organs
7 The mantle cavity contains a number of organs collectively called mantle complex or pallial complex. Epitaenia: It is a prominent ridge. It runs from the base of right nuchal lobe to the posterior end of the cavity. It divides the mantel cavity into a right branchial chamber and a large left pulmonary chamber. Pulmonary sac (lung): It is a large bag hanging in the mantle cavity from the roof of the mantle. It opens to the mantle cavity by a pulmonary aperture. Osphradium: It is olfactory in function. Ctenidium or gill: Rectum: It runs parallel to the ctenidium. It opens to the mantle cavity by anus. Genital duct: The genital ducts: oviduct in the female and vas deference in the male run parallel to the rectum.. The anterior chamber of the kidney: It is a reddish mass lies near the posterior end of the epitaenia
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9 Alimentary canal includes Mouth having secondary lips. Buccal mass is highly muscular present in the floor of mantle cavity.it is divided into small vestibule and large buccal cavity.the buccal cavity has radula.the radula has 7 rows of teeth. Oesophagus
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11 Stomach-Two parts-cardic stomach which receive oesophagus,the pyloric stomach gives off caecum. Intestine-long coiled tube extend backward &upward to coile in the viseral mass. Rectum Thick wall tube open by anus in the right nuchal lobe. Digestive Glands are dorsal buccal gland,salivery gland and hepatopancreas.
12 Two mode of respiration Aquatic mode of respiration by ctenidium Pila has a single gill which is monopectinate. There are two rows of lamellae attached to a free ctenedial axis.each lamella bears transverse ridges called pleats.the pleates contain blood vessels.exchange of gases is carried out between epithelium of lamellae andblood vessels.
13 Pulmonary sac or Lung It is present in the roof of the Pulmonary chamber. It has thin,moist,vascular and muscular walls. The lung communicates with the pulmonary chamber by a large aperture called pneumostome. A Gill lamella B- T.S. Gill lamella
14 It is of open type. It comprises of pericardium,heart, arteries, sinuses, veins and blood.
15 It comprises of a single kidney.it consists of anterior and posterior renal chamber. It communicates with the branchial chamber by renal aperture.renopericardial aperture is present between postreor renal chamber. Ultra filtration of blood help in primary urine formation..
16 Central Nervous System Peripheral Nervous System
17 Tentacles Statocysts Osphradium Eyes
18 Male reproductive system- Testis Vas deferens Copulatory Organs Hypobranchial gland
19 Ovary Oviduct Receptaculam Seminis Uterus Vagina
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