Question

The glass sponge Euplectella belongs to class of

• A. Demospongiae
• B. Hexactinellida
• C. Calcarea
• D. Hydrozoa

Answer 1

The correct option is B Hexactinellida

• The internal skeleton is made up of spongin fibers and spicules. Spicules are the structural elements found in most sponges. Sponges are classified on the basis of different types of spicules. They are:
• Calcarea - where the spicules are made up of calcium carbonate,
• Hexactinellida - where the spicules are made up of silica,
• Demospongia - where the spicules are composed of siliceous spicules or spongin fibers or both.
• Euplectella aspergillum is a hexactinellid sponge in the phylum Porifera inhabiting the deep ocean. They are elegant, glassy sponges, consisting of interwoven siliceous fibers and growing in the form of a cornucopia and also known as Venus's flower basket.

So, the correct answer is option B.