Poriferans Animals Math

There are about 8500 described living species under the phylum porifera worldwide.

Poriferans animals math. Porifera schwämme zu den ältesten metazoa gehörendes taxon mit ca. All adults are sessile attached to the substratum but their larva is motile. They vary in size from less than a centimeter to a mass that can fill your arm. Poriferans pore bearing animals are the first multicellular animals.

Sponges are the most primitive of the multicellular animals they have been around on earth for 600 million years or more. Although poriferans all seem similar once you dive into different parts of the ocean you ll. They are predominantly marine organisms which inhabit in the intertidal to the deepest ocean zone. Poriferans are stationary animals that live mostly in salt water and grow off of a rock substrate.

Body is porous provided with pores i e. They are basal metazoans characterized by the absence of true tissues with few exceptions a muscular or nervous system sensu stricto a digestive cavity and gonads the body architecture figure 8 11 is arranged around the aquiferous system which consists of a network of canals and chambers in the complex leucon type organization of freshwater. Pinacocytes mesenchyma cells and choanocytes. They are aquatic mostly marine rarely fresh water e g.

There are following characteristics of the phylum porifera. There are nine thousand species of sponges. Porifera possess no head and no tail. They are asymmetrical or radially symmetrical.

They are overwhelmingly marine organisms out of about 15 000 species only around 150 are found in freshwater. They are commonly called sponges because of their appearance. The term porifera is derived from two latin words porus meaning pores and ferre meaning bear. Their bodies consist of loosely organized cells.

Porifera sponges. They are primarily marine animals. They have three cell types.