SCIENCE
ZOOLOGY
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Detailed explanation-1: -Calcarea, Hexactinellida, Demospongiae, and Homoscleromorpha make up the four classes of sponges; each type is classified based on the presence or composition of its spicules or spongin.
Detailed explanation-2: -Spicules have four major symmetry types: Monaxon (simple cylinders with pointed ends), triaxon, tetraxon, and polyaxon. Sponges can be calcareous, siliceous, or composed of spongin. The meshing of numerous spicules serves as the sponge’s skeleton.
Detailed explanation-3: -Spicules are composed of either Calcium or Silica. Looking at composition is another way to narrow down possible sponge groupings.
Detailed explanation-4: -Calcareous spicules: The organic material in this type of spicules is calcium carbonate or calcite. Siliceous spicules: The organics material in this type of spicules is Colloidal silica or Silicon. Megascleres: These are larger spicules constituting main skeleton of sponge body. More items •25-Nov-2017