Baerida
 Baerida is an order in the subclass of Calcaronea.They are Leuconoid Calcaronea with the skeleton either composed exclusively of microdiactines or in which microdiactines constitute exclusively or predominantly a specific sector of the skeleton such as choanoskeleton or atrial skeleton. Large or giant spicules are frequently present in the cortical skeleton from which they can partially or fully invade the choanoderm.