Calcaronea is a subclass of sea sponges in the class Calcarea. They are Calcarea with the triactines and the basal system of tetractines sagittal (i.e. the rays of the spicule make unequal angles with each other), exceptionally regular.
Calcaronea is a subgroup of sea sponges in the Calcarea class. They possess triactines and a basal system of tetractines sagittal, indicating that the rays of their spicules form unequal angles and show high regularity.