The 9,000 or so species are all aquatic with most representatives living in salt water, although about 100 species live in fresh water habitats. T he Latin name of the phylum derives from the numerous pores found on the body surface. Īll adults sessile and attached to substratum.Īsexual reproduction by buds and gemmules and sexual reproduction by eggs and sperm free-swimming ciliated larvae. No organs or true tissues digestion intracellular, excretion and respiration by diffusion.
Skeletal structure of collagen and calcareous or siliceous spicules. Įpidermis of flat pinacocytes interior surfaces lined with choanocytes that create water currents area between a gelatinous protein matrix called mesoglea. Multicellular, body traditionally considered a loose aggregation of cells.īody with pores, canals and chambers that serve for passage of water.
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