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Sponges or sea sponges are primarily marine invertebrates of the metazoan phylum Porifera [4] (/ p ə ˈ r ɪ f ər ə ˌ p ɔː-/ pər-IF-ər-ə, por-; meaning 'pore bearer'), [5] a basal animal clade and a sister taxon of the diploblasts. [6]
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 ...
Demosponges (Demospongiae) are the most diverse class in the phylum Porifera. They include greater than 90% of all species of sponges with nearly 8,800 species worldwide (World Porifera Database). [5] They are sponges with a soft body that covers a hard, often massive skeleton made of calcium carbonate, either aragonite or calcite [citation ...
They are found in all oceans of the world, although they are particularly common in Antarctic and Northern Pacific waters. [3] They are more-or-less cup-shaped animals, ranging from 10 to 30 centimetres (3.9 to 11.8 in) in height, with sturdy skeletons made of glass-like silica spicules, fused to form a lattice.
Porifera: 10,800 [66] Yes [68] 200–300 ... Objects such as sediment-filled tubes that resemble trace fossils of the burrows of wormlike animals have been found in 1 ...
Amphimedon compressa can grow to a length of 40 cm (16 in) and a diameter of 4 cm (1.6 in), but it is usually smaller in shallow water. The tree-like curved branches grow from a basal encrusting mass, but very occasionally this sponge grows as a small, unbranched, flattened hemisphere.
Ostriches live in sub-Saharan Africa.There are two ostrich species: the common ostrich (Struthio camelus) is typically found in southern and eastern Africa, while the Somali ostrich (Struthio ...
Homoscleromorpha are exclusively marine sponges that tend to encrust on other surfaces at shallow depths. These sponges typically inhabit shady locations, under overhangs and inside caves. In the Mediterranean Sea, 82% of the species in this taxon can be found in caves, and 41% of them are found nowhere else. [10]