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the number of described fossil genera exceeds 900. The approximately 5,000 living sponge species are classified in the phylum Porifera, which is composed of three distinct groups, the Hexactinellida (glass sponges), the Demospongia, and the Calcarea (calcareous sponges).
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www.ucmp.berkeley.edu/porifera/porifera.html
www.ucmp.berkeley.edu/porifera/porifera.html
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Sponges come in an incredible variety of colors and an amazing array of shapes. They are predominantly marine, with the notable exception of the family Spongillidae, an extant group of fresh-water demosponges whose fossil record begins in the Cretaceous. ... Sponges are ubiquitous benthic creatures, ... TYPICAL SPONGE FEEDING;
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www.ucmp.berkeley.edu/porifera/poriferalh.html
www.ucmp.berkeley.edu/porifera/poriferalh.html
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Sponges (phylum Porifera) are an exclusively aquatic and, with a few exceptions (Vacelet and Boury-Esnault 1995), a filter-feeding group of animals. The group consists of approximately 15,000 extant species in three distinct groups (Hooper and van Soest 2002):
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tolweb.org/tree?group=Porifera&contgroup=Animals
tolweb.org/tree?group=Porifera&contgroup=Animals
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Sponge - Wikipedia, the free encyclopedia
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Sponges are animals of the phylum Porifera (pronounced /pɒˈrɪfərə/ ). Their bodies consist of jelly-like mesohyl sandwiched between two thin layers of cells. While all animals have unspeciali...
en.wikipedia.org/wiki/Sponge
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Sponges are considered the oldest of the animal phyla. The name Porifera means "pore bearer" in Latin. ... Learn more about Porifera in "Origins" ... Website links about sponges and Porifera...
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www.pbs.org/kcet/shapeoflife/animals/porifera.html
www.pbs.org/kcet/shapeoflife/animals/porifera.html
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; I wonder how much deeper the ocean would be without sponges ... Porifera Main. ... Introduction to the Porifera. More is here.
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cas.bellarmine.edu/tietjen/images/phylum_porifera.htm
cas.bellarmine.edu/tietjen/images/phylum_porifera.htm
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An introduction to the biology, classification and ecology of sponges, the phylum Porifera ... Characteristics of Porifera:-; 1)No definite symmetry. 2)Body multicellular, few tissues, no organs. 3)Cells and tissues surround a water filled space but there is no true body cavity. 4)All are sessile, (live attached to...
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www.earthlife.net/inverts/porifera.html
www.earthlife.net/inverts/porifera.html
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Porifera - 1 ... If we were to define Porifera cladistically (e.g. as Porifera = Calcarea + Hexactinellida), then essentially all animals would be poriferans. That's because the Porifera, as usually conceived, are not a "natural group." They do not include all of the descendants of a single organism.
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www.palaeos.com/Invertebrates/Porifera/Porifera.htm
www.palaeos.com/Invertebrates/Porifera/Porifera.htm
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PROTOCISTA, EUBACTERIA, & PORIFERA ... PORIFERA & ARCHAEOCYATHA ... Phylum Porifera...
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paleo.cortland.edu/tutorial/Protista/porifera.htm
paleo.cortland.edu/tutorial/Protista/porifera.htm
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