Animal Kingdom Test - 5

This is the largest phylumof Animalia which includes insects.

Petromyzon is a jawless vertebrate and hence included under Agnatha.

The most distinctive feature of Echinodermata is the presence of water vascular system.

All of them belong to Phylum Platyhelminthes and hence have dorso-ventrally flattened body and so, are called flatworms.

Locomotory organ of annelia is parapodia. Parapodium are in form of lateral fleshy protrusions on the body surface that help in movement and capturing food.

The Portuguese man-of-war is a siphonophore, an animal that is made up of a colony of organisms working together.Physalia is called Portuguese man-of-war. It is also called as blue bottle or floating terrror it is found floating on water surface. " The name comes from the uppermost polyp, a gas filled bladder, or pneumatophore, which sits above the water and somewhat looks like an old warship at full sail. They are also, known as bluebottles for the purple-blue color of their pneumatophores" (A Portuguese man of war). The tentacles can extend to 165 feet, although, the average length is 30 feet (Portuguese Man-of War Physalia physalis).

The property of a living organism to emit light is known as bioluminescence and is well-marked in ctenophores.

Earthworm belongs to phylum Annelida where as all other worms belong to phylum Aschelminthes.

Torpedo is a genus of rays, commonly known as electric rays, torpedo rays, or torpedoes. They are slow-moving bottom-dwellers capable of generating electricity as a defense and feeding mechanism.

Sensory organs like antennae, eyes(compound and simple), statocysts or balance organs are present in phylum Arthropoda.