Baerida

Baerida is an order of sea sponges in the subclass of Calcaronea.[1]

Baerida
Scientific classification
Kingdom:	Animalia
Phylum:	Porifera
Class:	Calcarea
Subclass:	Calcaronea
Order:	Baerida Borojevic, Boury-Esnault & Vacelet, 2000
Families
Baeriidae Lepidoleuconidae Trichogypsiidae

Species of the order Baerida are leuconoid calcareous sponges 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. In sponges with a reinforced cortex, the inhalant pores can be restricted to a sieve-like ostia-bearing region. Dagger-shaped small tetractines (pugioles) are frequently the sole skeleton of the exhalant aquiferous system. Although the skeleton may be highly reinforced by the presence of dense layers of microdiactines in a specific region, an aspicular calcareous skeleton is not