![]() ![]() Body shape can be cylindrical, vase-like, rounded or sac-like.They are generally marine aquatic organisms, with a few freshwater species.How do you identify a Porifera?Ĭharacteristic Features of Phylum Porifera 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). In a few marine species, gray cells play the leading role in rejection of foreign material. However, they reject grafts from other species but accept them from other members of their own species. Sponges do not have the complex immune systems of most other animals. “While not much is known about the lifespan of sponges, some massive species found in shallow waters are estimated to live for more than 2,300 years,” the study authors write. Sponges can live for hundreds or even thousands of years. … Sponges are very simple creatures with no tissues. While sponges, like corals, are immobile aquatic invertebrates, they are otherwise completely different organisms with distinct anatomy, feeding methods, and reproductive processes. What are the special abilities and interesting facts about porifera?.Which sponge body type is most efficient?. ![]() How many classes are there in Porifera?. ![]()
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