Synute

Synute refers to a type of sponge spicule characterized by having two axes of equal length fused together. These spicules are typically found in certain types of calcareous sponges (Porifera, Class Calcarea). The term describes the specific morphology of the spicule, referring to its shape rather than a specific genus or species. The fused axes often form a V or Y shape. The presence and form of synutes are important characteristics used in the classification and identification of calcareous sponges. These spicules provide structural support to the sponge body.