Which among the following pairs of 'animal - phylum of animal kingdom they belong' is incorrect?

The correct answer is Liver fluke - Nematoda.

Key Points

• Liver Fluke - 
  • The scientific name of liver fluke is Fasciola hepatica.
  • The life history of liver fluke involves two hosts (Digenetic parasitic).
  • Primary host - Sheep and goat
  • Secondary host - Garden snail (Planorbis, Lymnea)
  • Liver fluke belongs to the phylum Platyhelminthes, not Nematoda.
  • Liver fluke is a parasitic flatworm that infects the liver of its primary host, which is usually a sheep or goat.

Additional Information

• Sycon - Porifera
  • Sycon is a sponge that belongs to the phylum Porifera.
  • The common name of the Sycon is Crown Sponge.
  • All sponges have a canal system that consists of the Ostia, spongocoel, and osculum.
  • Canal system is one of the most important features of sponges.
  • The canal system is a network of canals that connect the spongocoel to the outside via ostia.
  • It helps in nutrition, respiration, and excretion processes.
• Prawns - Arthropoda
  • Prawn is a common name for small aquatic crustaceans with an exoskeleton and ten legs (i.e. a member of the order decapoda), some of which can be eaten.
  • They belong to the kingdom Animalia and order Arthropoda.
• ​Starfish - Echinodermata
  • Starfish belongs to the phylum Echinodermata group.
  • Echinodermata are so named owing to their spiny skin (from the Greek “echinos” meaning “spiny” and “dermos” meaning “skin”).
  • Echinodermata are exclusively marine organisms. Sea stars, sea cucumbers, sea urchins, sand dollars, and brittle stars are all examples of echinoderms.