Calcareous sponge
Class of marine sponges of the phylum Porifera which have spicules of calcium carbonate / From Wikipedia, the free encyclopedia
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The calcareous sponges[2][3] (class Calcarea) are members of the animal phylum Porifera, the cellular sponges. They are characterized by spicules made of calcium carbonate, in the form of high-magnesium calcite or aragonite. While the spicules in most species are triradiate (with three points in a single plane), some species may possess two- or four-pointed spicules.[4][5] Unlike other sponges, calcareans lack microscleres, tiny spicules which reinforce the flesh. In addition, their spicules develop from the outside-in, mineralizing within a hollow organic sheath.[6]
Quick Facts Scientific classification, Subclasses ...
Calcareous sponges | |
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"Calcispongiae" from Ernst Haeckel's Kunstformen der Natur, 1904 | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Porifera |
Class: | Calcarea Bowerbank, 1864 |
Subclasses | |
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