First slide

Classification of Animals

Question

The diagram below illustrates a medusa. Study the diagram to answer the question that follows:
In which group and its examples this body form is dominant?

Moderate

A

Hydrozoa : Obelia, Hydra, Physalia
B

Anthozoa : Meandrina, Pennatula, Adamsia
C

Scyphozoa : Aurelia, Jellyfishes
D

Cnidaria : Hydra, Aurelia, Obelia

Solution

Class Scyphozoa includes medusoid forms mostly. Medusa is umbrella- or bell-shaped, free-swimming and solitary form. Its mouth and tentacles face downward. Medusa is mostly seen in Aurelia, jellyfishes.

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