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Porifera


An orange Elephant Ear sponge, Agelas clathrodes (, , Agelasida, Agelasidae) at the Florida Keys National Maritime Sanctuary.


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Taxonomy Tentative Phylogeny

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The most primitive form of multicellular animal life, it is thought that sponges evolved independently of animal life, or else of . A recent alternative theory, suggested through is that they represent a paraphyletic grade of metazoa. Regardless of their actual phylogenetic relationship, the Porifera in many respects they are still little more than colonial protozoa. Over 5000 recent species are known, and many more fossil species. All are benthic, sessile, suspension-feeders which inhabited a wide variety of exclusively marine environments, from the early to the present day.

Sponges make their skeleton out of both organic fibers (primarily a material called (the stuff of natural bath sponges), secreted by cells, and inorganic (calcium carbonate or opalline silica needle-like structures), secreted by cells.

The major fossil record of these animals consists of the resistant spicules. After death, spicules are scattered across the sea floor and may be found as disarticulated microfossils.


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There are four main classes:

Class
Class
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Class

Two fossil groups are often included - the and the . The former are most likely Porifera (possibly Sclerospongiae or Demospongiae), while the precise relationships of the latter remain controversial.

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The basic body form of sponges consists of numerous small incurrent canals called (sing. ostium) and one or more large excurrent opening called (sing. osculum). Organization of chambers and channels varies however from simple to quite complex.

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