Knowra Calcareous sponge Calcareous sponge A sponge in the class Calcarea whose skeleton is made of calcium carbonate spicules. Calcarea includes both asconoid, syconoid, and leuconoid body forms.
Sponge : An aquatic animal in the phylum Porifera that filters food from water flowing through its body. Calcarea is one of the major classes within this animal phylum.
Sponge filtration : The process by which water passes through a sponge’s canals and cells, leaving suspended food particles behind. Calcareous sponges obtain food by filtering water through their bodies.
Calcarea : A class of sponges whose skeletons consist of calcium carbonate spicules. Calcareous sponges are members of this class.
Marine benthic ecology : The study of organisms and ecological processes on or near the seafloor. Calcareous sponges are sessile members of seafloor communities.
Demospongiae : The largest class of sponges, with skeletons made of spongin, siliceous spicules, or both. Unlike Calcarea, demosponges do not build skeletons from calcium carbonate spicules.
Spicule : A small skeletal element found in sponges, made of mineral material or, in some groups, protein. Calcium carbonate spicules form the defining skeleton of Calcarea.
Aquiferous system : The network of pores, canals, and chambers that conducts water through a sponge. Its layout determines how water reaches Calcarea’s feeding cells.
Porifera : The animal phylum of sponges, characterized by porous bodies and water-flow-based feeding. Calcarea is one lineage within the broader sponge phylum.
Bioerosion : The breakdown of hard substrates by organisms through mechanical or chemical activity. Some calcareous sponges bore into carbonate rock and shells.
Hexactinellida : A class of sponges whose skeletons are made of fused, six-rayed siliceous spicules. Its silica skeleton contrasts with the carbonate skeleton of calcareous sponges.
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