Euplectella belongs to class

Homocoela - Calcarea

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Hexactinellida

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Demospongiae

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Heterocoela - Calcarea

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Solution

The correct option is B Hexactinellida
Skeleton of some siliceous sponges like Euplectella is famous for beauty and is in great demand for marriage ceremonies in Japan. Euplectella belongs to order Hexasterophora under class Hexactinellida.
Class Calcarea include two orders, Homocoela and Heterocoela and include calcareous sponges.. Class Demospongiae include leuconoid sponges.
So, the correct answer is 'Hexactinellida'.

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