Phylum Mollusca (snail)

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snail eating
Snail morphology

shell

snail

INTERESTING FACTS 

  • The garden snail (Helix aspersa) is a terrestrial gastropod mollusk and one of the best-known species in the world. 
  • It is so common that it is one of the most proliferated terrestrial mollusks.
  • The Helix aspersa is an air-breathing snail, which has a single lung. 
  • They have a brownish soft body, covered with slimy mucus and yellow or cream-colored shells with brown spiral stripes. 
  • The shell of this species has a height of about 0-9-1.3 Inches, and a width of 0.9-1.5 inches and a lip appears at its edge when an individual is old.
  • Not all individuals have the shell of the same color
  • This mollusk has a soft body protected by the shell, but when it is not feeding or when it feels danger, it retracts to its shell.\
  • it moves with a gliding motion aided by the release of mucus to reduce the friction with the surface. 

CLASSIFICATION
  1. Gastropoda
  2. Cephalopoda
  • 1. There are around 800 living species of cephalopod. Amateur fossil hunters frequently find extinct species, such as ammonites.
  • 2. They are complex and intelligent, with well-developed senses, nervous systems and large brains. Cephalopods are considered the most intelligent of all invertebrates.
  • 3. Octopuses possess great vision; experiments have shown that they can distinguish attributes of various objects, including brightness, size, shape, and horizontal or vertical orientation. Yet most are also color blind.
  • 5. Cephalopods are older than dinosaurs, appearing in fossil records 500 million years ago.
  • 6. Even though they are color blind, most cephalopods can camouflage themselves with the 
  • 7. These skills are not just for camouflage; cephalopods also change colors and textures when trying to warn others off or while trying to attract a mate.
  • 8. Fins and tentacles are usually a cephalopod’s main forms of propulsion, with jet propulsion used for sudden bursts of speed. The larger the cephalopod, the less efficient its jet propulsion skills.
  • 9. The largest octopus is the North Pacific giant octopus (GPO), which can grow to be almost 15 feet long.
  • 10. The largest squid is the colossal squid, but not much is known about this species as it lives deep in the oceans. Some dead specimens, thought to be juveniles, have the largest eyes in the animal kingdom.3.

  1. Bivalvia
  • The bivalves are a large class of molluscs, also known as pelecypods.
  • They have a hard calcareous shell made of two parts or 'valves'. The soft parts are inside the shell. The shell is usually bilaterally symmetrical.
  • There are over 30,000 species of bivalves, including the fossil species. There are about 9,200 living species in 1,260 genera and 106 families. All of them live in the water, most of them in the sea or in brackish water. Some live in fresh water. All are filter feeders: they lost their radula in the course of evolution. A few are carnivorous, eating much larger prey than the tiny microalgae eaten by other bivalves.
  • The best known examples of bivalves are clams, mussels, scallops and oysters.

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