How many pairs of eyes does Pila have?
Eyes : Two eyes are located one at the base of each longer pair of tentacles. Each eye is a closed vesicle (Fig. 2.109D) with the inner wall lined by photosensitive or retinal cells. The opening of the vesicle is covered by transparent outer and inner corneas.
How many whorls are present in the shell of Pila globosa?
It is a flat plate-like whitish structure, more or less triangular in outline, situated in the upper part of the first 2½ – 3 whorls of the shell. It lies closely attached to the digestive gland along its upper and inner or columellar edge and is separated from the shell by a thin cutaneous membrane.
What is Pila human body?
The body of Pila is enclosed in a thick spirally-coiled globular univalve shell. The shell has the form of an elongated cone coiled around a central axis in a spiral manner. A single revolution of the shell around the axis is called a whorl.
What are the functions of Pila?
The radula at the posterior end enters into a radular sac which supplies new teeth to the radula. The radula is pushed forward by muscles from behind and it works as a file by rasping food materials. Pila is a vegetable feeder and takes leaves of aquatic weeds by cutting with the jaws.
Does Pila globosa give Pearl?
Pila globosa is an amphibious apple snail. Its flesh is commonly used as prawn feed in aquaculture. It is also used a poultry feed and as human feed in some places. Pearls are produced by molluscan bivalves or clams.
How many teeth does Pila have?
Therefore in Pila 21112 teeth are present in each row of radula. Pila is also called an Apple snail. Pila respire by gills in water or by pulmonary sac on land.
Which sperm can fertilize ovum in Pila?
The tail has a cilium. These sperms can fertilize the ovum. Oligopyrene sperms: These are sickle shaped. They show 4 to 5 cilia.
Is Pila a snail?
Pila is a genus of large freshwater snails with an operculum, African and Asian apple snails, aquatic gastropod mollusks in the family Ampullariidae, the apple snails….Pila (gastropod)
How do you identify Pila?
1) Pila is soft bodied animal is enclosed in a shell. 2) Shell is spirally coiled round an axis called the collumella and opens outside by the mouth or aperture. 3) Operculum is well developed and close the aperture or the mouth of the shell. 4) Soft body consist of head, foot and visceral mass.
How many teeth are found in Pila?
Each row has seven teeth, two marginal and one lateral tooth on each side and a central or rachidian tooth in the middle, thus, giving a formula 2, 1, 1, 1, 2.
How many teeth does pila have?
What is mantle and mantle cavity?
Definition of mantle cavity : the cavity between the mantle and the body proper of a mollusk or brachiopod in which the respiratory organs lie.