The unique feature of sponge development in members of the class Calcarea is the amphiblastula which

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The unique feature of sponge development in members of the class Calcarea is the amphiblastula which turns inside out during its development. This stage involves the formation of an embryo with an outer layer of cells surrounding an inner cell mass. During development, the embryo undergoes a process called inversion, where the outer layer of cells turns inside out to form an inner cavity. This results in the formation of a hollow, spherical embryo called the amphiblastula.

The Unique Feature of Sponge Development in Members of the Class