Which animal belonging to Phylum Coelenterata also known as the Portuguese man-of-war?

The correct answer is "Physalia".Key Points

• Physalia also known as the Portuguese man-of-war, is a marine hydrozoan found in the Atlantic Ocean and the Indian Ocean.
• It is considered to be the same species as the Pacific man of war or blue bottle, which is found mainly in the Pacific Ocean.
• The Portuguese man of war is the only species in the genus Physalia, which in turn is the only genus in the family Physaliidae.
• The Portuguese man of war is a conspicuous member of the neuston, the community of organisms that live on the ocean surface.
• It has several venomous microscopic nematocysts which supply a painful sting effectively sufficient to kill fish and has been regarded to from time to time kill humans.
• Although it superficially resembles a jellyfish, the Portuguese man of war is in fact a siphonophore.
• Like all siphonophores, it's far a colonial organism, made of many smaller devices known as zooids.
• All zooids in a colony are genetically identical but fulfil specialized functions such as feeding and reproduction, and collectively permit the colony to function as an unmarried individual.

Additional Information

•  Adamsia:
  • Adamsia is a genus of sea anemones withinside their own circle of relatives Hormathiidae. 
  • Species in this genus are collectively symbiotic with hermit crabs.
  • The anemone gets a place to live and discards scraps of the crab's food in exchange for its help in the crab's defence.
  • As those anemones grow, they secrete an attractive membrane, referred to as a carcinoecium, which overlies the crab's authentic snail shell and expands the residing area of the crab. 
  • This means the anemone does not have to change the substrate and the crab does not have to seek a larger shell as they both grow.
• Nereis:
  • Nereis is a genus of polychaete worms withinside their own circle of relatives Nereididae.
  • It contains many species, the maximum of which might be marine.
  • Nereis own setae and parapodia for locomotion and fueloline exchange.
  • They can also additionally have sorts of setae, that are observed at the parapodia.
  • Acicular setae offer support.
  • Locomotor setae are for crawling and are the bristles which are seen outdoors of the Polychaeta.
  • They are cylindrical in shape, located now no longer handiest in sandy areas, and they're tailored to burrow.
  • They frequently hold to seagrass (Posidonia) or different grass on rocks and occasionally accumulate in huge groups.
• Ancylostoma:
  • Ancylostoma duodenale is a species of the roundworm genus Ancylostoma. 
  • It is a parasitic nematode worm and is commonly known as the Old World hookworm.
  • It lives withinside the small gut of hosts which includes humans, cats and dogs, wherein it may mate and mature.
  • Ancylostoma duodenale and Necator americanus are the 2 human hookworm species that are typically mentioned collectively because of the motive of hookworm infection.
  • They are dioecious.
  • Ancylostoma duodenale is ample in the course of the world, consisting of Southern Europe, North Africa, India, China, Southeast Asia, and some areas in the United States, the Caribbean, and South America.