Study Guides/Biology/Adamsia (Sea Anemone)
Study Guide · Biology

Adamsia: Classification and Symbiosis

Adamsia is a genus of sea anemones. Studied primarily in Class 11 Animal Kingdom, it is an excellent example of mutualism (symbiosis) in the marine ecosystem.

Question (Click to Flip)

To which phylum does Adamsia belong?

Answer

Adamsia belongs to the phylum Cnidaria (also known as Coelenterata).

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Key Facts

Adamsia exists only in the 'polyp' form (sessile and cylindrical). It does not have a 'medusa' stage.

It exhibits radial symmetry.

It has a gastrovascular cavity with a single opening acting as both mouth and anus.

1. Biological Classification

  • Kingdom: Animalia
  • Phylum: Cnidaria (Coelenterata)
  • Class: Anthozoa
  • Genus: Adamsia

Its common name is the Sea Anemone. Like all Cnidarians, it possesses stinging cells called cnidoblasts used for defense and capturing prey.

2. Symbiotic Relationship with Hermit Crabs

Adamsia is famous for its mutualistic relationship with the hermit crab (Eupagurus).

  • The sea anemone attaches itself to the empty snail shell inhabited by the hermit crab.
  • Benefit to the Crab: The stinging tentacles of the anemone protect the crab from predators like octopuses.
  • Benefit to the Anemone: As the crab moves around looking for food, the anemone gets transported to new feeding grounds and eats the leftover food scraps.

Questions and Answers

To which phylum does Adamsia belong?+

Adamsia belongs to the phylum Cnidaria (also known as Coelenterata).

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