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  2. Sponge - Wikipedia

    en.wikipedia.org/wiki/Sponge

    Sponges were traditionally distributed in three classes: calcareous sponges (Calcarea), glass sponges (Hexactinellida) and demosponges (Demospongiae). However, studies have now shown that the Homoscleromorpha , a group thought to belong to the Demospongiae , has a genetic relationship well separated from other sponge classes.

  3. Category:Sponges by classification - Wikipedia

    en.wikipedia.org/wiki/Category:Sponges_by...

    This category lists animals of the phylum Porifera, sorted by taxonomic classes. Subcategories. This category has the following 4 subcategories, out of 4 total. C.

  4. Calcareous sponge - Wikipedia

    en.wikipedia.org/wiki/Calcareous_sponge

    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 ...

  5. Homosclerophorida - Wikipedia

    en.wikipedia.org/wiki/Homosclerophorida

    These sponges are massive or encrusting in form and have a very simple structure with very little variation in spicule form (all spicules tend to be very small). Reproduction is viviparous and the larva is an oval form known as an amphiblastula. This form is usual in calcareous sponges but is less common in other sponges.

  6. List of animal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_animal_classes

    The following is a list of the classes in each phylum of the kingdom Animalia. There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by ...

  7. Hexactinellid - Wikipedia

    en.wikipedia.org/wiki/Hexactinellid

    Hexactinellid sponges are sponges with a skeleton made of four- and/or six-pointed siliceous spicules, often referred to as glass sponges. They are usually classified along with other sponges in the phylum Porifera , but some researchers consider them sufficiently distinct to deserve their own phylum, Symplasma .

  8. Category:Sponges - Wikipedia

    en.wikipedia.org/wiki/Category:Sponges

    Prehistoric sponges (6 C, 4 P) T. Sponge taxa by rank (5 C) ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  9. Demosponge - Wikipedia

    en.wikipedia.org/wiki/Demosponge

    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 ...