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Sponges constitute the phylum Porifera, and have been defined as sessile metazoans (multicelled immobile animals) that have water intake and outlet openings connected by chambers lined with choanocytes, cells with whip-like flagella. [13]: 29 However, a few carnivorous sponges have lost these water flow systems and the choanocytes.
All three sponge body plans (asconoid, syconoid, and leuconoid) can be found within the class Calcarea. Typically, calcareous sponges are small, measuring less than 10 cm (3.9 in) in height, and drab in colour. However, a few brightly coloured species are also known. Like the Homoscleromorpha, calcareous sponges are exclusively viviparous. [7]
The Clathrinida are an order of calcareous sponges found in marine environments. Clathrinida is a well-known non-monophyletic order under the class of calcarea, and was first named in 1958 by Willard D Hartman based on corticalization (body cortex)[5].
The Porifera phylum contains all sponges which are characterized by the small pores on the outer layer, which take in water. The cells in the sponge walls filter food from the water. Whatever is not uptaken by the sponge is pumped through the body out of a large opening. The class demosponges are
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 ...
Category: Sponges by classification. 3 languages. ... This category lists animals of the phylum Porifera, sorted by taxonomic classes. Subcategories.
Sponges are hermaphrodites, producing both egg and sperm. Sperm is released from one sponge and brought in through the ostia of another sponge. Once the sperm reaches the body cavity it is fertilized and develops into a free-swimming larvae. The free-swimming larvae are released out the osculum and will eventually settle and attach elsewhere. [6]
The phylum Porifera includes the aquatic fauna sponges. Subcategories. This category has the following 8 subcategories, out of 8 total. ...
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